Journal of Threatened Taxa |
www.threatenedtaxa.org | 26 September 2022 | 14(9): 21853–21861
ISSN 0974-7907 (Online) | ISSN 0974-7893 (Print)
https://doi.org/10.11609/jott.7785.14.9.21853-21861
#7785 | Received 14 December 2021 | Final received 25 July
2022 | Finally accepted 27 August 2022
Morphology
characterization and phytochemical overview of the Moluccan Ironwood Intsia bijuga (Colebr.) Kuntze, a living
collection of Purwodadi Botanic Garden, Indonesia
Melisnawati H. Angio
1, Elga Renjana
2 & Elok Rifqi Firdiana 3
1–3
Purwodadi Botanic
Garden, Research Center for Plant Conservation, Botanic Gardens, and Forestry,
National
Research and Innovation Agency, Jl. Surabaya-Malang Km.65 Pasuruan,
67163, East Java, Indonesia.
1
melisbio08@gmail.com
(corresponding author), 2 elgarenjana@gmail.com, 3 elok.firdiana@gmail.com
Abstract:
As one of the ex situ
conservation sites, Purwodadi Botanic Garden (PBG)
has Intsia bijuga
as its collection with high economic value for its high quality wood. It is
categorised as Near Threatened in the IUCN Red List.
Its efficacy as herb is due to the presence of its various chemical compounds.
The purpose of this study was to characterize the morphology of I. bijuga cultivated in PBG and to reveal its
phytochemical compounds, as well as their health benefits. This research was
conducted at the PBG in April–May 2020. The plant material was obtained from
PBG collection. The plant morphology was characterized by direct observation in
the field, while information regarding phytochemical compounds of I. bijuga along with their benefits was obtained by
literature review. The data obtained was analyzed descriptively. The results
showed that I. bijuga collected by PBG came
from Maluku and Java. Both have morphological characteristics that are not very
different, i.e., they are trees, they have compound leaves, pale stems with
lenticels on their surface, panicle flowers, pod-shaped fruits, and buttress roots.
I. bijuga contains polyphenol compounds that
have medicinal benefits, such as anti-bacterial, anti-cancer, and anti-viral,
hence it has enormous medicinal potential. Due to habitat shrinkage of the
species, an effort to have it conserved ex situ is critical.
Keywords: Conservation site, Fabaceae,
Merbau, plant morphology, phytochemical compounds.
Editor: Lal Ji
Singh, Botanical Survey of India, Port Blair, India. Date of publication: 26 September 2022 (online
& print)
Citation: Angio, M.H., E. Renjana
& E.R. Firdiana (2022). Morphology characterization and phytochemical overview
of the Moluccan Ironwood Intsia bijuga (Colebr.) Kuntze, a living collection of Purwodadi
Botanic Garden, Indonesia. Journal of Threatened Taxa 14(9): 21853–21861.
https://doi.org/10.11609/jott.7785.14.9.21853-21861
Copyright: © Angio et al. 2022. Creative Commons Attribution 4.0 International
License. JoTT
allows unrestricted use, reproduction, and distribution of this article in any
medium by providing adequate credit to the author(s) and the source of
publication.
Funding: The authors received no financial support for the research,
authorship, and/or publication of this article.
Competing interests: The authors declare no competing interests.
Author details & Author contributions: Author details: Melisnawati H. Angio achieved her master in Plant
Biology from Bogor Agricultural University and she is presently working as a
researcher in Research Center for Plants Conservation, Botanic Gardens, and
Forestry, BRIN. She is interested in botany and plants conservation, especially
local fruit plants. Recently, she is studying rare and endemic plants in
Sulawesi and also seeds conservation of National Park. Elga Renjana is a researcher at the
Research Center for Plants
Conservation, Botanic Gardens and Forestry, National Research and
Innovation Agency (BRIN). He earned his M.Sc. degree from Biology Department, Airlangga University in 2017. His research interests are
conservation of plants (Pteridophyte in particular), seeds, and modelling. He
is also interested in predicting the potential of medicinal plants using
docking analysis. To complete his task as plant conservation scientist, he also
actively explores Indonesian forest. In addition of research activities, he is
also active as an editor of Jurnal Penelitian Kehutanan Wallacea and the member of the Indonesian Researcher Union
(PPI). Elok Rifqi Firdiana completed her Biology
master degree from Brawijaya University. She is
currently a researcher in National Research and Innovation Agency. She is
interested in the conservation of threatened species in Indonesia hence she
joined the Research Center for Plants Conservation, Botanic Gardens and
Forestry. Beside working on in vitro propagation of certain species of Dipterocarpaceae, she is also involved in seed conservation
of wild bananas project.
Author contributions: MHA built the concept, did the field work, and initiated the manuscript
writing. ER helped the field work, did the data analysis, and developed the
manuscript. ERF compiled the data, developed the manuscript, and translated it.
All authors were involved in the finalization of the manuscript.
Acknowledgements:
The authors would like to thank the Registration Unit
of Purwodadi BG for the assistance of the I. bijuga data collection used in this research.
INTRODUCTION
Intsia
is a woody plant genus of the family Fabaceae
(Leguminosae) which has a natural habitat in lowland tropical rain forests (Heyne 1987). They grow in forests up to 1,000 m and are
often found in zones behind mangrove forests, brackish forests, and river banks
(Samingan 1975). Their distribution comprises from
Tanzania, West Indian Ocean, Taiwan to tropical Asia, and southwestern Pacific.
Based on The Plant List (2013), Intsia has
eight accepted species, i.e., Intsia africana, I. attenuata,
I. bijuga, I. bijuga
var. retusa, I. bracteata, I. cuanzensis, I. palembanica,
I. petersiana, and I. rhombodea.
On the other hand, Plants of the World Online (2022) states that Intsia consists only of I. bijuga
and I. palembanica, while other species
are included in genus Afzelia.
Intsia
bijuga (Colebr.)
Kuntze is a tree up to 40 m height and is known as
Merbau or Moluccan Ironwood. It is native to southeastern Asia, Oceania,
Madagascar, and eastern Africa (Image 1), while in Indonesia it can be found in
almost all islands, especially Maluku, Kalimantan, and Papua (Baskorowati & Pudjiono 2015;
GTA 2019). It lives in lowland tropical rain forests, capable of growing in the
altitude of 1,000 m, and is often found in the riverside zone and behind
mangrove forests (Yudohartono & Ismail 2013).
Intsia
bijuga has high economic value for
its high quality wooden structure. Until now, it was
one of the favorites of Indonesian natural forest entrepreneurs (Tokede et al. 2013) and is very well known for export
because it is widely used as furniture, plywood or woodworking (Pudjiono 2017). This has led to an increase in demand and
massive logging of I. bijuga (Sirami et al. 2019). Forest destruction has exacerbated
this situation, causing a reduction in the abundance of this species and
declining wild populations (Margono et al. 2012;
Vincent et al. 2015; Sirami et al. 2019). Therefore
since 1998 it has been included in IUCN Red List (IUCN 1998). Concerns about
its extinction have led to the inclusion of this species on the CITES list with
Appendix III status (limited trading) (Tokede et al.
2013). Hence various rescue actions need to be taken to reduce the risk of
extinction, one of which is ex situ conservation efforts.
In addition to considering the risk of extinction,
awareness of plant conservation can also be raised by increasing the useful
value of the plants. So far, I. bijuga has
been used as traditional medicines in various countries including Philippines,
Madagascar, Vanuatu, and Papua New Guinea to treat various diseases such as
rheumatism, dysentery, urinary tract infections, asthma, diabetes, ulcers, and
fractures (Norscia 2006; Koch et al. 2015), while in
Indonesia, its bark is used as a medicine for flatulence and liver (Widodo et
al. 2018). These various benefits are of course related to its various chemical
compounds. Thus, the disclosure of information on phytochemical compounds in I.
bijuga as well as its health benefits is also
necessary in order to further increase its beneficial value.
As an ex situ conservation
area, Purwodadi Botanical Garden (BG) has a
collection of I. bijuga from Java and Maluku.
Nevertheless, information on the morphology and content of phytochemical
compounds about I. bijuga originating from
Indonesia has not been widely published. This study aimed to characterize the
morphology of I. bijuga from Indonesia
cultivated in the Purwodadi BG. In addition, this
study also revealed the phytochemical compounds contained in I. bijuga and their health benefits.
METHODS
This study was conducted at Purwodadi
BG from April to May 2020. The leaves, stems, fruit and seeds as the study
materials were obtained from Purwodadi BG (Image 2).
Morphological characters observed included habit, root type, shape and size of
leaves, fruit, and seeds. The morphological characterization was carried out
based on Harris & Harris (2001). In addition, information regarding the
name of the collector, the location of the original habitat, and location of
the collection was obtained from the Plant Collection Catalog Information
System (SIKATAN) of Purwodadi BG.
The species identity confirmation was
performed through morphological character approach of study material on
herbarium specimen and morphology description from relevant articles and books.
The references for herbarium were specimens from Herbarium Purwodadiense
and Kew’s Herbarium (The Herbarium Catalogue 2022), whilst the reference
articles and books were “Studies in Malesian Caesalpinioideae (Leguminosae)”,
“The genera Acrocarpus, Afzelia,
Copaifera and Intsia”
(Hou 1994) and “Caesalpiniaceae
(Leguminosae-Caesalpinioideae)” (Hou et al. 1996), a
book chapter of Flora Malesiana.
Furthermore, the search for information on
phytochemical compounds of I. bijuga and its
benefits was carried out using the literature study method between 2010–2020
through Google Scholar, Mendeley, and Science Direct websites with the keywords
“Instia bijuga”,
“phytochemical”, and “natural compound”. The morphological character and
phytochemical compounds data obtained were then analyzed descriptively to
inform the potential of I. bijuga as a drug.
RESULTS
AND DISCUSSION
Collection
Database
Based on the database of PBG or Sistem
Informasi Katalog Koleksi Tanaman Kebun Raya Purwodadi (2020),
there are 12 collection numbers of the I. bijuga
cultivated in five different locations/vak. The
plants were the results of exploration in Indonesia (Maluku Islands and Java
Island) and spontaneously collected. The age of the collection plants also
varied, 24–65 years (Table 1).
Morphology
of Intsia bijuga
So far, studies on morphology of I. bijuga in Indonesia have not been widely carried out
and the information provided is still general and not specific (Rimbawanto & Widyatmoko 2006;
Yudohartono & Ismail 2013; Pudjiono
2017). Based on direct observations, I. bijuga
is a perennial tree with a height of about 15–23 m (Image 3A). This is slightly
different from I. bijuga growing in Papua New
Guinea, where at the age of eight it has reached a height of 12 meters with a
trunk diameter of 15 cm (Gunn et al. 2004). The growing conditions and altitude
factors were thought to have an indirect effect on plant growth, thus affecting
plant height (Finkeldey & Hattemer
2007). The growth direction is erectus, hardwood and strong stems, elongated
round shape like cylindrical, rough surface, showing lenticels on the surface
of the stem and the length of the free stem before branching is about 7–10 m,
releasing a little lymph and pale stems slightly greenish due to the lichen
covering the stem surface (Image 3B).
Intsia
bijuga has folium compositum
consisting of 2–4 leaflets with a length of 7–12 cm per leaflet (Image 4A). The
layout of the leaves is opposite and the shape is elipticus.
The arrangement of penninervis with the costa is
sloping so that the two parts of the leaf on the right and left of the leaf
bone are asymmetric (Image 4B). The nerves lateralis are clearly visible and stop
before reaching the leaf margins, the veins are smaller, forming a mesh and are
not too prominent. Flat leaf edges are integer, thin but quite stiff with
thickness of 0.05–0.1 mm, green leaf color with smooth abaxial and adaxial
surface, hairless and not wrinkled. When compared with the leaves of I. bijuga in the Pacific Islands (Thaman
et al. 2006), the leaf color of I. bijuga in Purwodadi BG is slightly darker. The shape of the tip of
the leaf is acutus with the two edges of the leaf on
the right and left of the costa gradually going upward and meeting at the tip
of the leaf to form an acute angle. The base of the leaf is rotundatus
and attached to the petiolus. Petiolus is
cylindrical with slightly flattened upper side, green in color, thickened at the
base with a diameter of 0.3-0.5 cm and does not show any wrinkles, hair,
scales, lenticels or supporting leaves (Image 4C).
Direct observation of I. bijuga
in Purwodadi BG showed that the cultivated plants had
not yet entered the flowering season which usually occurs in January and lasts
for 30–45 days. Slightly different from I. bijuga
in the Northern territory where the cultivated plants flower in June and
December, in its natural habitat, I. bijuga
flowers in March (Cowie & Westaway 2012). Based on the observations
conducted by Baskorowati & Pudjiono
(2015), I. bijuga has unlimited bisexual inflorescentia centripetala and
grows terminally and monopodially at the end of a
branch. The peduncle grows steadily with branches that can branch again and the
flowers bloom with acropetal type.
Although at the time of observation, I. bijuga had not yet entered the flowering season, part
of the fruit was left over from the previous fertilization season. Fruit of I.
bijuga is single true fruit dry pods with a length
of 8–24 cm, smaller than the fruit of I. bijuga
from Vanuatu which has a size of 10–30 cm (Thaman et
al. 2006). The fruit is formed from one fruit leaf, it has a room with pseudo
barriers where each fruit has a number of seeds, about 2–10 (Image 5). When
young, the fruit is green and it is brown when ripe. Flat seeds, with 3–4 cm
length with a black surface. The spermodermis is
quite hard, where the tesla has a stiff texture and is like wood or stone. The
hilus is clear, rough and brownish in color, slightly different from the
surface color of the seed coat. The roots of I. bijuga
are buttress type, where the roots grow high above the ground, and are flat
like boards with a thickness of about 5–8 cm (Image 6). With the age of more
than 20 years, the root of I. bijuga
cultivated in Purwodadi BG is quite small compared to
that of the root of I. bijuga growing in
forests which can reach 4 m (Thaman et al. 2006). The
root bark is pale, slightly greenish in color because it is covered by lichen
and the surface is rough with scattered lenticels, and there are no spines near
the roots.
In general, the plant morphology of I. bijuga does not vary too much in habit, stem growth
direction, and root type between vaks/locations
(Table 2). Although differences in morphological characters can be influenced
by environmental factors, I. bijuga cultivated
in Purwodadi BG do not significantly differ in
morphology because they are in relatively the same environmental conditions. In
addition, their vak/locations are quite close each
other in Purwodadi BG area.
Quite different morphological variations can be seen
in leaf size, where I. bijuga collected from
Maluku, Halmahera planted in Vak XIII.I seems to have
larger leaves than other I. bijuga planted in
other vaks, with the ratio of length to width is 2:
1. Meanwhile, other leaf morphological characters such as leaf type, leaf
layout, leaf shape, and leaf venation do not show clear differences (Image 7).
According to morphological characterization conducted
in this study, the state character of Intsia
bijuga lies in its compound leaves, which is
2-jugate leaf. This is in consonant with morphological descriptions of I. bijuga stated by Arifiani
(2018), Hou et al. (1996), dan Hou (1994). Additionally, they also mentioned
that another state character is the glabrous petiole.
Phytochemical
compounds of I. bijuga and their benefits
From the identification of chemical compounds by
Hillis & Yazaki (1973), it can be inferred that the wood of I. bijuga has six polyphenol compounds, consisting of four
flavonoids and two stilbenes. The main polyphenol in this plant is flavonoid,
namely robinetin, while the other three flavonoids
are dihydromyricetin (ampelopsin), myricetin,
naringenin. The two stilbenes in I. bijuga
include 3,5,4’-trihydroxystilbene (resveratrol) and 3,5,3 ‘,
4’-tetratrihydroxystilbene (piceatannol). Based on literature studies, each of
these chemical compounds has many health benefits (Table 2).
The variety of health benefits of I. bijuga is related to the role of each compound it
contains at the organ and cellular levels. It’s main
potential is the prevention and treatment of tumors and cancer is due to its
anti-oxidant, anti-tumor, and anti-cancer properties. According to Zhou et al.
(2014) ampelopsin as one of the compounds contained
in I. bijuga inhibited the growth of breast
cancer cells as well as induced apoptosis. Furthermore, I. bijuga also plays a role in the maintenance of body
organs such as the heart (cardioprotective), liver (hepatoprotective), eyes,
and the nervous system (neuroprotective). Neuroprotective properties are very
important for stroke, Alzheimer’s, and Parkinson’s patients in order to reduce
the symptoms they suffer from.
The compounds of I. bijuga
also have anti-inflammatory benefits. Inflammation is an immune system response
to harmful stimuli, such as pathogens, damaged cells, toxic compounds, or
irradiation. Inflammation causes discomfort since it causes swelling, redness,
burning sensation, pain and reduced tissue function (Takeuchi & Akira 2010)
so often anti-inflammatory drugs are used to reduce these symptoms. However,
these drugs have many side effects, including gastric ulcers and cardiovascular
complications, damage to kidney and the respiratory system (Henry 1988; Sostres et al. 2010). Various herbal plants have been
developed to overcome the side effects of using synthetic anti-inflammatory
drugs and I. bijuga can be a potential natural
ingredient for this purpose with its anti-inflammatory components.
I. bijuga
also has the potential to play a role in helping the body’s immune system fight
pathogens with its anti-bacterial, anti-parasitic, and anti-viral properties.
One of the flavonoids of I. bijuga with
anti-viral activity is robinetin. According to Kumar & Pandey (2013), robinetin is able to inhibit HIV-1 proteinase activity. In
addition, I. bijuga might play a role in the
maintenance of body homeostasis with its anti-hypertensive properties and its
action in regulating blood sugar in diabetics and also its capacity as plasma
lipids regulator. With all the active compounds that are useful and work
synergistically for the health of the body, I. bijuga
has the potential to be one of the leading medicinal plants.
Recent
Conservation Status of Intsia bijuga and Prospective Research for its Conservation
Intsia
bijuga is distributed across several
regions of Indonesia, including Sumatra, Kalimantan, Sulawesi, Maluku, East
Nusa Tenggara, and Papua. However, its distribution in Indonesia has begun to
decrease due to illegal logging activities, so that it only remains in the
Papua and Maluku regions (Rimbawanto & Widyatmoko 2006). With its superior quality of wood, this
species has become a major production target for timber entrepreneurs in Papua,
which raises concerns that it will face extinction in nature (Tokede et al. 2013). In 2020, it has been assessed into the
category of Near Threatened (NT) with a decreasing population trend on the IUCN
Red List v2.3 (Barstow 2020). Thus it can be inferred
that it faces a high risk of extinction in the wild in the near future.
In addition to illegal logging activities, the decline
in the population of I. bijuga is also caused
by its natural growth factors. Naturally, this plant only bears fruit once a
year from September to December (Baskorowati & Pudjiono 2015). In its natural habitat, seeds are very easy
to obtain, but sometimes seedlings under the mother tree, especially on sandy
and loamy soils, are difficult to find (Sirami et al.
2019). Thus, research on phenology and seed viability in ex situ conservation
areas is expected to initiate a solution to this problem. Intensive maintenance
and fertilization carried out in this area may have a positive impact on
flowering and seed viability of I. bijuga.
Study on the propagation of I. bijuga
can be done to increase the quantity of individuals. When deemed sufficient,
the population of I. bijuga can be
reintroduced in their natural habitat. Population reintroduction is henceforth
a common practice in conservation to alleviate the loss of plant species.
Generally, the aim of population reintroduction is to establish genetically
variable populations, to increase gene flow and to minimize the probability of
population extinction (Kaulfuß & Reisch 2017).
Based on the description of the medicinal potential of
I. bijuga, the six active compounds of I. bijuga are mainly found in wood. However, if only the
wood is used, then the sustainability of this species will be threatened. Therefore further research is needed on the content of its
active compounds in other parts, such as leaves and seeds which are more
abundant. In addition, the use of technology such as callus culture can be
considered to produce the active compound in I. bijuga
without having to extract it directly from nature. Callus cultures have gained
commercial potential for the manufacture of secondary metabolites of
therapeutic significance. Callus culture has been reported to be more reliable
than collecting plant materials from the wild for extracting the therapeutic
metabolites. They can be used for the generation of multiple clones of plants
using micropropagation, and can also be used to develop single-cell suspension
cultures employing either batch or continuous fermentation to produce the
preferred secondary metabolites. Previous studies reported that callus cultures
have been used for the production of tropane alkaloids, ajmaline, serpentine,
reserpine, flavonoids, scopolamine, paclitaxel, stilbene, resveratrol and
anthocyanins (Chandran et al. 2020).
CONCLUSION
Purwodadi
Botanic Garden has a collection of I. bijuga
originating from the Maluku Islands (Maluku: Halmahera) and Java. The results
showed that all collections of I. bijuga
observed had morphological characters that were not much different, namely tree
habitus, compound leaves, pale stems with lenticels on the surface, panicle
flowers, pod-shaped fruit and buttress roots. Based on literature studies, the
wood of this species contains polyphenol compounds with medicinal benefits,
such as anti-bacterial, anti-cancer, anti-viral, and so on. It shows that it
has enormous medicinal potential. Therefore, ex situ conservation of these
plants is very important considering that their numbers have decreased in their
natural habitat.
Table
1. Intsia bijuga
cultivated in Purwodadi Botanic Garden.
Vak |
Collection
number |
Access
number |
Collector |
Date
of cultivation |
Origin |
Note |
XIII.E.I. |
01-01abcd |
P1986080306 |
LHP
08 |
1986-12-11 |
- |
Spontaneous
collection |
XIII.F. |
25 |
P1986070183 |
IS
221 |
1986-12-11 |
South
west Maluku |
Obtained
from exploration |
XIII.H. |
48 |
P1955020044 |
- |
1955-03-02 |
West
Java |
Obtained
from exploration |
XIII.I. |
11-11a-11bc |
P1995070068 |
IS
68 |
1996-11-11 |
Maluku:
Halmahera |
Obtained
from exploration |
XIII.K. |
01-01a |
P196002126 |
- |
1962-01-11 |
Java |
Obtained
from exploration |
Table
2. Phytochemical compunds in I. bijuga and their health benefits.
|
Phytochemical
compunds |
Compound
Group |
Part
of Plant used |
Health
Benefits |
References |
1 |
Dihydromyricetin
(Ampelopsin) |
Flavonoid |
Stem |
Provides
neuroprotective effect on the brain injured by an ischemic stroke |
Ye
at al. 2017 |
Induces
cell growth inhibition and apoptosis in breast cancer cells |
Zhou
et al. 2014 |
||||
Acts
as anti-bacterial, anti-inflammatory, anti-tumor, hepatoprotective,
anti-hypertensive anti-oxidant, plasma lipid and blood sugar regulator;
provides neuroprotection |
Liu
et al. 2019 |
||||
2 |
Naringenin |
Flavonoid |
Stem |
Acts
as anti-hepatitis C, anti-aging, anti-Alzheimer's, anti-asthma,
anti-chikungunya virus, anti-seizure epilepsy, anti-dengue virus,
anti-diabetic, anti-edwardsiellosis,
anti-hyperlipidemic, anti-inflammatory, anti-microbes, anti-oxidants,
anti-platelets in cardiovascular disease, anti-damage due to stroke,
cardioprotective, chronic kidney disease, expectorants, eye protective,
hepatoprotective, radioprotective; provides aids against infertility,
immunodepression, and constipation |
Salehi
et al. 2019 |
3 |
Myricetin |
Flavonoid |
Stem |
Acts
as anti-oxidant, anti-cancer, anti-inflammatory, anti-diabetic; provides
protective effects against Parkisone and
Alzheimer's |
Semwal et al.
2016 |
4 |
Robinetin |
Flavonoid |
Stem |
Acts
as anti Proteus vulgaris, anti-tumor, anti-HIV-1 |
Kumar
& Pandey 2013 |
5 |
3,5,3’,4’-tetratrihydroxystilbene
(Piceatannol) |
Stilbene |
Stem |
Acts
as anti-oxidant, anti-cancer, anti-parasitic, anti-bacterial; plays a role in
cell signaling |
Piotrowska et al.
2012 |
6 |
3,5,4’-trihydroxystilbene
(Resveratrol) |
Stilbene |
Stem |
Acts
as anti-oxidant, cardioprotective, chemopreventive
agent against cancer, anti-inflammatory, neuroprotective; has anti-viral
properties |
Liu
et al. 2019 |
For images
– click here for full PDF.
REFERENCES
Arifiani, D.
(2018). Morphological identity of Intsia
palembanica Miq. and Intsia bijuga (Colebr.) Kuntze (FABACEAE)
[Poster Presentation]. The 3rd International Conference on Tropical
Biology “Conservation, Enhancement and Sustainable Use of Indigenous Tropical
Flora and Fauna”, SEAMEO BIOTROP.
Barstow,
M. (2020). Intsia bijuga. The IUCN Red List of Threatened
Species 2020: e.T32310A2813445. Downloaded on 2nd May 2020. https://doi.org/10.2305/IUCN.UK.2020-3.RLTS.T32310A2813445.en
Baskorowati, L. &
S. Pudjiono (2015). Morfologi pembungaan dan sistem reproduksi merbau (Intsia bijuga) pada
plot populasi perbanyakan
di paliyan. Gunung Kidul. Jurnal Pemuliaan Tanaman Hutan 9(3): 159–175. https://doi.org/10.20886/jpth.2015.9.3.159-175
Cowie,
I. & J. Westaway (2012). Threatened Species of the
Northern Territory. Accessed on 14th May 2020. www.denr.nt.gov.au
Chandran,
H., M. Meena, T. Barupal & K. Sharma (2020). Plant
tissue culture as a perpetual source for production of industrially important
bioactive compounds. Biotechnology reports 26: e00450. https://doi.org/10.1016/j.btre.2020.e00450
Finkeldey, R. &
H.H. Hattemer (2007). Tropical
Forest Genetics. Springer, New York, 315 pp.
GTA
(Global Tree Assessment) (2019). Intsia
bijuga. The IUCN Red List of Threatened Species.
Version 2021-3. https://www.iucnredlist.org/species/32310/2813445. Accessed on
11st July 2022
Gunn,
S., A. Agiwa, B. Bosimbi,
B. Brammal, L. Jarua &
A. Uwamariya (2004). Seed
Handling and Propagation of Papua New Guinea’s Tree Species. CSIRO,
Canberra, 315 pp.
Harris,
J.G. & M.W. Harris (2001). Plant Identification
Terminology. Spring Lake Publishing, St. Genola,
216 pp.
Henry,
D.A. (1988). Side-effects of non-steroidal anti-inflammatory
drugs. Baillieres Clin Rheumatol
2(2): 425–454. https://doi.org/10.1016/s0950-3579(88)80021-9
Hillis,
W.E. & Y. Yazaki (1973). Polyphenols of Intsia heartwoods. Phytochemistry 12: 2491–2495. https://doi.org/10.1016/0031-9422(73)80461-3
Hou,
D. (1994). Studies in Malesian Caesalpinioideae (Leguminosae). I.
The genera Acrocarpus, Afzelia,
Copaifera, and Intsia. Blumea 38: 313–330.
Hou,
D., Leiden, K. Larsen & A.S.S. Larsen (1996).
Caesalpiniaceae (Leguminosae-Caesalpinioideae), pp.
409–730. In: Kalkman, C. (ed.). Flora Malesiana: Spermatophyta. (Flowering Plants). Rijksherbarium, Netherland, 740 pp.
Hyene, K.
(1987). Tumbuhan Berguna Indonesia I. Badan Penelitian dan Pengembangan Hasil
Hutan, Jakarta, 2521 pp.
IUCN
(1998). Intsia bijuga. The IUCN
Red List of Threatened Species. Downloaded on 16th May 2020. https://doi.org/10.2305/IUCN.UK.1998.RLT
.T32310A9694485.en
Kaulfuß, F. &
C. Reisch (2017). Reintroduction
of the endangered and endemic plant species Cochlearia bavarica-Implications from conservation genetics. Ecology
and Evolution 7(24): 11100–11112. https://doi.org/10.1002/ece3.3596
Koch,
M., D. Andrew, B. Kinminja, M. Sabak,
G. Wavimbukie, K.M. Barrows, T.K. Matainaho,
L.R. Barrows & P.P. Rai (2015). An
ethnobotanical survey of medicinal plants used in the East Sepik province of
Papua New Guinea. Journal of Ethnobiology and Ethnomedicine 11: 1–26. https://doi.org/10.1186/s13002-015-0065-8
Kumar,
S. & A.K. Pandey (2013). Chemistry and biological
activities of flavonoids : An overview. Phytochemistry
2013: 1–16. https://doi.org/10.1115/2013/1622750
Margono, B.A.,
P.V. Potapov, S. Turubanova, F. Stolle & M.C.
Hansen (2012). Primary forest cover loss in Indonesia over 2000 –
2012. Nature Climate Change 4: 730–735. https://doi.org/10.1038/NCLIMATE2277
Liu,
D., Y. Mao, L. Ding & X. A. Zeng (2019).
Dihydromyricetin: A review on identification and quantification methods,
biological activities, chemical stability, metabolism and approaches to enhance
its bioavailability. Trends in Food Science & Technology 91:
586–597. https://doi.org/10.1016/j.tifs.2019.07.038
Norscia, I.
(2006). Ethnobotanical reputation of plant species from two
forests of Madagascar: a preliminary investigation. South African Journal of
Botany 72: 656–660. https://doi.org/10.1016/j.sajb.2006.04.004
Piotrowska, H., M. Kucinska & M. Murias (2012).
Biological activity of piceatannol: leaving the shadow of resveratrol. Mutation
Research 750(1): 60–82. https://doi.org/10.1016/j.mrrev.2011.11.001
Plants
of the World Online (2022). Intsia
Thouars. Royal
Botanic Gardens, Kew. https://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:500954-1
Pudjiono, S.
(2017). The growth variation of merbau (Intsia
Bijuga O. Ktze) from
shoot cutting of several population at dry area [Paper Presentation]. Proceeding
Biology Education Conference 14:195–199.
Rimbawanto, A. &
A. Widyatmoko (2006). Keanekaragaman
genetik empat populasi Intsia bijuga berdasarkan penanda RAPD dan implikasinya bagi program konservasi genetik. Jurnal Penelitian Hutan Tanaman 3(3): 149–154.
Salehi,
B., P. Valere, T. Fokou, M.
Sharifi-rad, P. Zucca, R. Pezzani
& J. Sharifi-rad (2019). The therapeutic potential of
Naringenin. A Review of Clinical Trials 26: 1–18. https://doi.org/10.3390/ph12010011
Samingan, T.
(1975). Dasar-dasar Ekologi
Umum. Bagian Ekologi. Departemen Botani IPB, Bogor, 135
pp.
Semwal, K.D.,
R.B. Semwal, S. Combrinck
& A. Viljoen (2016). Myricetin: a dietary molecule with diverse biological
activities. Nutrients 8(2): 1–31. https://doi.org/10.3390/nu8020090
Sirami, E.V., D. Marsono, R. Sadono & M.A. Imron (2019). Typology of native species as
the shade tree for merbau ( Intsia
bijuga ) plantations in Papua, Indonesia based
on ecological species group. Biodiversitas
20(1): 43–53. https://doi.org/10.13057/biodiv/d200106
Sistem Informasi Katalog Koleksi Tanaman Kebun Raya Purwodadi (2020).
Data Koleksi Tanaman Intsia bijuga (Colebr.) Kuntze.
192.168.82.5/portal/sikatan/data_katalog.php
Sostres, C., C.J. Gargallo, M.T. Arroyo & A. Lanas
(2010). Adverse effects of non-steroidal anti-inflammatory
drugs (NSAIDs, aspirin and coxibs) on upper
gastrointestinal tract. Best Practice & Research Clinical
Gastroenterology 24(2): 121–132. https://doi.org/10.1016/j.bpg.2009.11.005
Takeuchi,
O. & S. Akira (2010). Pattern recognition receptors and inflammation. Cell
140(6): 805–820.
Thaman, R.R.,
L.A.J. Thomson, R. DeMeo, F. Areki
& Cr. Elevitch (2006). Intsia bijuga
(vesi), ver 3.1. Species
profiles for Pacific Island agroforestry, Permanent Agricultural Resource
(PAR). http://www.traditionaltree.org
The
Herbarium Catalogue (2022). Intsia
bijuga. Royal Botanic Gardens, Kew. http://apps.kew.org/herbcat/detailsQuery.do?imageId=364825&pageCode=1&presentPage=1&queryId=1&sessionId=3FD0A5E7FEB1879304578C232985A5D3&barcode=K000789040
The
Plant List (2013). Intsia.
Version 1.1. http://www.theplantlist.org/tpl1.1/search?q=intsia
Tokede, M.J.,
B.V. Mambai, L.B. Pangkali
& Z. Mardiyadi (2013).
Antara Opini dan Fakta, Kayu Merbau. Jenis Niagawi Hutan
Tropika Papua Primadona
yang Dikhawatirkan Punah.
WWF Indonesia, Jakarta, 65 pp.
Vincent,
J.B., B. Henning, S. Saulei, G. Sosanika
& G.D. Weiblen (2015).
Forest carbon in lowland Papua New Guinea :
Local variation and the importance of small trees. Australian Ecology
40: 151–159.
Widodo,
H., A. Rohman & S. Sismindari
(2018). Pemanfaatan tumbuhan famili Fabaceae untuk pengobatan liver oleh pengobat tradisional berbagai etnis di Indonesia. Media
Penelitian dan Pengembangan
Kesehatan 29(1): 65–88.
Ye,
X.L., L.Q. Lu, W. Li, Q. Lou, H.G. Guo & Q.J. Shi (2017).
Oral administration of ampelopsin protects against
acute brain injury in rats following focal cerebral ischemia. Experimental
And Therapeutic Medicine 13(5): 1725–1734. https://doi.org/10.3892/etm.2017.4197
Yudohartono, T.P.
& B. Ismail (2013). Adaptabilitas, pertumbuhan dan regenerasi pada
plot konservasi ex situ Merbau. Jurnal
Pemuliaan Tanaman Hutan 7(3): 179–196. https://doi.org/10.20886/jpth.2013.7.3179-196
Zhou,
Y., F. Shu, X. Liang, H. Chang, L. Shi, X. Peng, J. Zhu & M. Mi (2014). Ampelopsin induces
cell growth inhibition and apoptosis in breast cancer cells through ROS
generation and endoplasmic reticulum stress pathway. Plos
One 9(2): 1–9.