Kushan U Tennakoon

Kushan U Tennakoon
Federation University Australia · School of Science, Psychology and Sport

BSc ( Hons.), PhD

About

110
Publications
32,279
Reads
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1,043
Citations
Introduction
I am experienced in global research engagement & management; HDR student supervision. Expertise: Environmental Science, Plant Biology,, Plan Developmental Biology Physiology Professional Awards: International Postgraduate Research Scholarship (IPRS) -Univ of Western Australia- Doctoral studies ; Fulbright Senior Fellowship, USA for post doctoral research; Third World Academy of Science (TWAS) Young Scientist Award for Biology; University of Peradeniya Scholarship for best Hons results.
Additional affiliations
December 2008 - present
Universiti Brunei Darussalam
Position
  • Managing Director
Description
  • Brief Introduction: Specialized in Global Research Engagement and Student Mobility Programs related to Environmental Sustainability
December 2008 - present
Universiti Brunei Darussalam
Position
  • Professor (Associate)
March 1992 - September 2014
Position
  • Professor (Associate)
Description
  • Have served in Universities of Peradeniya (Sri Lanka) & Old Dominion University (Virginia, USA). Since 2008 I'm attacted to Universiti Brunei Darussalam

Publications

Publications (110)
Article
Most mistletoe–host ecophysiological studies have paid attention to the influence of parasites on host performance. This paper explored the impact of varying hosts on the photosynthesis of a single mistletoe species. Here, we studied an obligate xylem-tapping tropical mistletoe (Dendrophthoe curvata (Blume) Miquel) parasitizing four different hosts...
Article
Foliar elemental concentrations are predictors of life-history variation and contribute to spatial patterns in biogeochemical cycling. We examined the contributions of habitat association, local soil environment, and elemental interactions to variation in foliar elemental concentrations in tropical trees using methods that account for phylogeny.We...
Article
Rural communities have traditionally valued forests for a diversity of products and services, with timber serving a minor role. No-where has this diversity been greater than in tropical South Asia, and in particular south India and Sri Lanka. As economies advance towards full development and populations become increasingly urbanized, forests become...
Article
A plant parasite parasitizing another plant parasite is known as a hyperparasite. Information is scarce regarding the ecophysiology of hyperparasites and their hosts despite their potential to illuminate processes of host–parasite solute flux. Here we present mineral profiles and stable isotopic data for two associations of the hyperparasite Viscum...
Article
Full-text available
Pioneer tree species of tropical rain forests in the seedling and sapling size classes are generally associ-ated with disturbances to the forest canopy. Pioneers have usually been lumped together within the same broad guild. Many studies have demonstrated differentiation of late successional shade-tolerant species within a forest but only a few stu...
Article
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Cassytha, also known as laurel dodder or love vine, is a stem hemiparasite of the Lauraceae family. It has long been used for medicinal purposes in many countries and has increasingly influenced agricultural and natural ecosystems by its effects on a wide range of host species. Previous studies have focused on the taxonomy and evolutionary position...
Article
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The uncontrolled invasive spread of exotic Acacias is a growing concern for many tropical ecosystems, particularly due to their negative impact upon nutrient cycling. Studies investigating the effects of Acacia invasion on nutrient cycling have focused on litterfall and litter decomposition, although its impact on ion deposition in tropical ecosyst...
Article
Full-text available
The adverse impacts of fires on the diversity of native plants in forest ecosystems are well documented. Tree diversity was studied in coastal heath (Kerangas) forests of Brunei Darussalam, Northwest Borneo after fire events. Eight 20 x 20 m plots were set up in once-burnt (3 plots), twice-burnt (3 plots) and unburnt heath forests (2 plots). All tr...
Article
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The impacts of climate change, in particular via elevated temperature and atmospheric CO2 concentrations, cause differential photosynthetic responses between native and invasive alien plants, often resulting in varying magnitudes of plant growth and productivity. This study investigated variations in photosynthetic responses of an invasive alien Ac...
Article
Exotic Acacia were introduced to Brunei Darussalam in the 1990s for plantation forestry and land rehabilitation but are now regarded as invasive. We assessed the effects of Acacia on litter nutrient composition and soil physicochemical properties of Brunei’s coastal Kerangas (heath) forests. Soil and litter samples were collected from ten 20 x 20 m...
Article
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A survey was conducted to identify the parasitic plant species occurring in timber and fruit trees during November 2015 to April 2017, in 15 Districts of Wet and Intermediate Zones of Sri Lanka using two stage stratified random sampling scheme. The parasitic plants on fruit and timber trees were identified by comparing them with the specimen in Nat...
Article
Seedlings of invasive species often exhibit superior physiological traits that facilitate their spread at early stages of invasion, although it is unclear whether these traits persist at the post-establishment stage. To determine whether mature exotic Acacia spp. possess superior traits over mature native plants, we compared foliar gas exchange and...
Article
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Plants of the genus Cuscuta (Convolvulaceae) have often been mistaken as Cassytha filiformis, an unrelated genus in the family Lauraceae in Brunei Darussalam. Large majority of Cuscuta species are holoparasitic and all species of Cassytha are obligate stem hemiparasites. Also, Cassytha is perennial, whilst Cuscuta is annual. The chlorophyll content...
Article
Full-text available
The mistletoes, stem hemiparasites of Asia and Europe, have been used as medicinal herbs for many years and possess sophisticated systems to obtain nutrients from their host plants. Although knowledge about ethnomedicinal uses of mistletoes is prevalent in Asia, systematic scientific study of these plants is still lacking, unlike its European count...
Article
We measured parameters of photosynthetic capacity, instantaneous gas exchange and leaf mineral contents of tropical mistletoe Dendrophthoe curvata parasitising three hosts, viz, Andira inermis (Fabaceae), Mangifera indica (Anacardiaceae) and Vitex pinnata (Verbenaceae) in a secondary tropical heath (Kerangas) forest patch in Brunei Darussalam in re...
Article
The Burmanniaceae contain several lineages of achlorophyllous mycoheterotrophic plants that associate with arbuscular mycorrhizal fungi (AMF). Here we investigate the isotopic profile of a green and potentially mycoheterotrophic plant in situ, Burmannia coelestis, and associated reference plants. We generated δ 13C and δ 15N stable isotope profiles...
Article
Full-text available
Acacias are some of the most successful invasive plants in the tropics, causing significant negative impacts on the biodiversity and ecosystem services of invaded habitats. Their successful invasiveness is partly attributed to the ability to accumulate large soil seed banks in the areas that they invade. Seedling emergence and soil seed bank compos...
Article
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Transgenic Nipponbare which over-expressed a Na+/H+ antiporter gene OsNHX1 was used to compare its growth performance, water status and photosynthetic efficiency with its wild type under varying salinity regimes. Chlorophyll content, quantum yield and photosynthetic rate were measured to assess the impact of salinity stress on photosynthetic effici...
Article
Full-text available
The morphology of the hypogeous root holoparasite Hydnora triceps is highly reduced, and as with many holoparasites, the vegetative body is difficult to interpret. The vegetative body of H. triceps has been historically considered a ''pilot root'' studded with lateral appendages known as ''haustorial roots.'' We found the vegetative body of H. tric...
Article
Cuscuta species (dodders) are widespread stem holoparasites that depend on host plants for their entire mineral and water and most carbohydrate requirements. Dodders negatively affect host photosynthesis but precise information on their impact on hosts in the presence of environmental stress factors (i.e. drought) is little known. In a pot experime...
Article
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Genetic variations of 12 different rice cultivars in Brunei Darussalam were studied using 15 different SSR markers and their salinity tolerance mechanism was also assessed. Eight SSR markers, RM 151, 187, 206, 226, 276, 310, 320 and 334, showed polymorphic alleles while the other seven were monomorphic. A total of 158 alleles were amplified for all...
Article
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Chlorophyll and xanthophyll dyes extracted from a single source of filamentous freshwater green algae (Cladophora sp.) were used to sensitize dye sensitized solar cells and their performances were investigated. A more positive interaction is expected as the derived dyes come from a single natural source because they work mutually in nature. Cell se...
Article
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The use of anthocyanin dyes extracted from epidermal leaves of Tradescantia spathacea (Trant) and petals of Ixora coccinea (IX) was evaluated in the application of dye-sensitized solar cells (DSSCs). Subsequently, cocktail anthocyanin dyes from these dyes were prepared and how they enhanced the cell’s overall performance was assessed using five dif...
Article
KBFSC (Kuala Belalong Field Studies Centre) is a research centre located in a remote tropical evergreen rainforest in Brunei Darussalam in South East Asia. It is visited by biologists and ecologists from all over the world. Power is available at the centre for 8-10 hours per day from a diesel generator (DG). The diesel travels2-3 hours by road, by...
Conference Paper
Differences in Survival and Growth Among Tropical Rain Forest Pioneer Tree Seedlings in Relation to Canopy Openness and Herbivory. Although differences in canopy openness, herbivory and their interaction may promote species coexistence, how these factors affect pioneer tree species and potentially limit growth, and survival has been poorly studied...
Article
Full-text available
Natural dyes have become a viable alternative to expensive organic sensitizers because of their low cost of production, abundance in supply, and eco-friendliness. We evaluated 35 native plants containing anthocyanin pigments as potential sensitizers for DSSCs. Melastoma malabathricum (fruit pulp), Hibiscus rosa-sinensis (flower), and Codiaeum varie...
Article
Full-text available
Although differences in canopy openness, herbivory and their interaction may promote species coexistence, how these factors affect pioneer tree species and potentially limit growth, and survival has been poorly studied, particularly in tropical South Asia. We monitored the effect of canopy openness and herbivore damage on seedling survival and grow...
Article
Full-text available
The adsorption of natural pigments onto TiO2 nanoparticles was investigated. The pigments were extracted from the dark purple colored pulp of the berry-like capsule of Kuduk-kuduk (Melastoma malabathricum L.). The Langmuir, Freundlich, Redlich-Peterson, and Sips isotherm models were used to analyze the equilibrium experimental data. Data correlated...
Article
Full-text available
Our understanding of mineral nutrition and carbon heterotrophy in mistletoes is derived largely from arid and temperate plant communities. Sharp differences between the tropical, temperate and arid communities, such as seasonality, water availability and mean temperature may influence basic assumptions regarding mistletoe physiology. Thus, we prese...
Article
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The luxuriant natural forests of the western lower slope of the Knuckles range have been heavily deforested since the mid-19 th century for conversion to coffee and tea plantations. Consequently, only scant floristic and ecological signatures of the original vegetation are ,. Recently, an isolated forest fragment at 500-700 m amsl, not recorded pre...
Article
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Structural attributes of Santalum album L. (Sandalwood) haustoria have been long overlooked in the literature. This is surprising since successful haustorial formation is key to the survival of individuals of this ecologically and economically important plant. We investigated the morphology of haustoria formed by S. album attached to one of its pri...
Article
There are large gaps in our understanding of parasite–host nutrient relationships. Our goal was to evaluate transdermal water loss, parasite–host mineral relationships, and heterotrophy in the holoparasitic genus Hydnora. We estimated in situ transdermal water loss in Hydnora and measured nutrient profiles and δ13C and δ15N signatures for Hydnora a...
Article
Full-text available
The genus Cuscuta (Corlvolvulaceae) has been poorly acknowledged in Brunei Darussalam, and often mistaken as Cassytha fliformis, an unrelated genus in the lamily Lauraceae. At present, the only Crscala species which has been positively identified in Brunei Darussalam to the species level (based on its floral morphology) is Cuscuta anslralis R. Brow...
Article
Full-text available
We provide the first germination data on the root-holoparasitic Hydnoraceae. Aqueous root extracts of host and non-host Euphorbia spp. were applied to seeds of Hydnora triceps Drège & Meyer, a narrow endemic of Namibia and South Africa. The seeds of H. triceps germinated only in response to root extracts of its exclusive host, Euphorbia dregeana Me...
Article
Full-text available
The morphology of the hypogeous root holoparasite Hydnora triceps is highly reduced, and as with many holoparasites, the vegetative body is difficult to interpret. The vegetative body of H. triceps has been historically considered a "pilot root" studded with lateral appendages known as "haustorial roots." We found the vegetative body of H. triceps...
Article
Infestation of Acacia acuminata by the xylem-tapping mistletoe Amyema preissii invariably results in inhibition of growth, defoliation and eventual death of host branch parts distal to the mistletoe. Branch sectional areas proximal (P) and distal (D) to mistletoes are used to classify stages of parasitism, with P:D area ratios of 5–6 invariably ass...
Conference Paper
Full-text available
This study examined the adaptability of two non-timber Iiana species Coscinium fenestratum Colebr. (Menispennaceae) and Calamus ovoideus Thw. (Arecaceae) grown under different light intensities in a forest restoration trial established in 1991 in the Pinus caribaea buffer zone in Sinharaja. Enrichment species have been introduced to different tree...
Article
Full-text available
The study included current distribution, host range, taxonomy and anatomy of the host-parasite association. The lowland Cuscuta spp. identified in the present study was different to Cuscuta chinensis as previously reported but similar to Cuscuta campestris. It was observed that Cuscuta is widely distributed in the dry areas such as Anuradhapura, Po...