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Department of Agricultural Biology: Recent submissions

Now showing items 1-20 of 87

New Chlorinated Metabolites and Antiproliferative Polyketone from the Mangrove Sediments-Derived Fungus Mollisia sp. SCSIO41409

Cai, J.; Wang, X.; Gan, X.; Zhou, Q.; Luo, X.; Yang, B.; Liu, Y.; Rathnasekara, Disna; Zhou, X. (Multidisciplinary Digital Publishing Institute (MDPI), 2022-12-30)

Two new chlorinated metabolites, 8-chlorine-5-hydroxy-2,3-dimethyl-7-methoxychromone (1) and 3,4-dichloro-1H-pyrrole-2,5-dione (3), and eight known compounds (2 and 4–9) were isolated from the mangrove sediments-derived ...
Phenotypic Characterization of Oryza nivara (Sharma et Shastry) Collected from Different Ecological Niches of Sri Lanka

Sandamal, S.; Tennakoon, A.; Wijerathna, P.; Ge, Song; Amarasekara, DABN; Marambe, B.; Elwany, Sara M.; Sabagh, Ayman El; Hassan, Mohamed M.; Rathnasekara, Disna (Tech Science Press, 2022-02-22)

Information on the genetic diversity of wild rice species in Sri Lanka is relatively meagre, though it plays a key role in crop improvement programs of cultivated rice (Oryza sativa L.). The present study was carried out ...
Effect of Water Stress during Seed Production and Storage Time on Germination and Seedling Growth of Cowpea Grown in the Dry Zone of Sri Lanka

Piyarathne, M; Wijayaraja, I.; Devasinghe, D. A. U. D.; Weerasinghe, L. K. ; Kumarathunge, D. P.; Dissanayake, D. M. D.; Malaviarachchi, M. A. P. W. K.; Nalaka, G. D. A. (Postgraduate Institute of Agriculture, Sri Lanka, 2022-04-01)

The water stress during the flowering stage of cowpea reduces the seed yield of the same season, but its effect on seed germination and seedling growth in the following season remains poorly understood. This study was ...
Acclimation of Ecophysiological and Agronomic Traits to Increasing Growth Temperature in Three Cowpea Genotypes Grown in Anuradhapura, Sri Lanka.

Wijayaraja, I.; Piyarathne, M.; Alahakoon, T.; Devasinghe, U.; Weerasinghe, L.; Kumarathunge, D.; Dissanayake, D.; Egodawatta, C.; Geekiyanage, N. (Hindawi, 2022-06-09)

The future of food crop production is uncertain due to the negative effects of global warming. Cowpea is grown in warm environments including in Sri Lanka, where less is known about the potential acclimation of eco-physiological ...
A reporting format for leaf-level gas exchange data and metadata

Ely, K. S.; Rogers, A.; Agarwal, D. A.; Ainsworth, E. A.; Albert, L. P.; Ali, A.; Anderson, J.; Aspinwall, M. J.; Bellasio, C.; Bernacchi, C.; Bonnage, S.; Buckley, T. N.; Burnett, A. C.; Busch, F. A.; Cavanagh, A.; Cernusak, L. A.; Crystal-Ornelas, R.; Damerow, J.; Kumarathunge., D.; Yang, S. (Elsevier, 2021-03-01)

Leaf-level gas exchange data support the mechanistic understanding of plant fluxes of carbon and water. These fluxes inform our understanding of ecosystem function, are an important constraint on parameterization of ...
Low sensitivity of gross primary production to elevated CO2 in a mature eucalypt woodland.

Yang, J.; Medlyn, B. E.; De Kauwe, M. G.; Duursma, R. A.; Jiang, M. ; Kumarathunge, D.; Crous, K. Y.; Gimeno, T. E.; Wujeska-Klause, A.; Ellsworth, D. S. (Copernicus Publications, 2020-01-20)

The response of mature forest eco systems to arising atmospheric carbon dioxide concentration(Ca)is a major uncertainty in projecting the future trajectory of the Earth’s climate. Although leaf-level net photosynthesis is ...
TRY plant trait database – enhanced coverage and open access

Kattge,J.; Bönisch,G.; Díaz,S.; Lavorel,S; Prentice,I.C.; Leadley,P.; Tautenhahn,S.; Aakala,T.; Werner,G.D.A.,; Abedi,M.; Acosta,A.T.R.; Adamidis,G.C.; Adamson,K.; Aiba,M.; Albert,C.H.; Alcántara,J.M.; Alcázar, C, C.; Aleixo, I.; Kumarathunge, D. P.; Wirth,C. (John Wiley & Sons, Inc., 2020-01-01)

Plant traits—the morphological, anatomical, physiological, biochemical and phenological characteristics of plants—determine how plants respond to environmental factors, affect other trophic levels, and influence ecosystem ...
Incorporating non-stomatal limitation improves the performance of leaf and canopy models at high vapour pressure deficit.

Yang, N.; Duursma, R. A.,; De Kauwe, M. G.; Kumarathunge, D.; Jiang, M.,; Mahmud, K.; Ellsworth, D. S.; Gimeno, T. E.; Crous, K. Y; Choat, B.; Eamus, D.; Medlyn, B. E. (Oxford Academic, 2019-12-13)

Vapour pressure deficit (D) is projected to increase in the future as temperature rises. In response to increased D, stomatal conductance (gs) and photosynthesis (A) are reduced, which may result in significant reductions ...
Genotypic differences in cardinal temperatures for in vitro pollen germination and pollen tube growth of Coconut

RANASINGHE, C.S.; KUMARATHUNGE, M. D. P.; KIRIWANDENIYA, K. G. S. (Cambridge University Press, 2017-07-25)

Successful fruit set in coconut depends on several reproductive processes including pollen germination and pollen tube growth. High temperature (˃33 °C) during ﬂowering reduces fruit set in coconut. Therefore, identiﬁcation ...
Variation in yield and yield components of different coconut cultivars in response to within year rainfall and temperature variation

Samarasinghe, C.; Meegahakumbura, M.; Perera, L.; Kumarathunge, D.,; Dissanayaka, H., (Elsevier, 2018-08-19)

The yield (no. of nuts/palm/year) of coconut (Cocos nucifera L.) is highly inﬂuenced by the amount and distribution of rainfall and year-round temperature. Thisstudy was conducted to evaluate the variation in yield and ...
Trees tolerate an extreme heatwave via sustained transpirational cooling and increased leaf thermal tolerance

Drake, J. E.; Tjoelker, M. G.; Vårhammar, A.; Medlyn, B.; Reich, P. B.; Leigh, A.; Pfautsch, S.; Blackman, C. J.; Aspinwall, M. J.; Crous, K. Y.; Duursma, R. A.; Kumarathunge, D.; De Kauwe, M. G.; Jiang, M.; Nicotra, A. B.; Tissue, D. T.; Choat, B.; Atkin, O. K.; Barton, C. V. M. (John Wiley & Sons, Inc., 2018-01-07)

Heatwaves are likely to increase in frequency and intensity with climate change, which may impair tree function and forest C uptake. However, we have little information regarding the impact of extreme heatwaves on the ...
Use of unobserved components model for forecasting non-stationary time series: a case of annual national coconut production in Sri Lanka

Brintha, N.K.K.; Samita, S.; Abeynayake, N.R.; Idirisinghe, I.M.S.K.; Kumarathunga, M.D.P. (Postgraduate Institute of Agriculture, Sri Lanka, 2014)

Forecasting a time series is generally done by using autoregressive integrated moving average (ARIMA) models. The main drawback of this technique is that the time series should be stationary. In reality, this assumption ...
Response of Crops to Heat Stress in a Warming World: Adaptation Measures under Sri Lankan Context.

Weerasinghe, K. W. L. K.,; Nalaka, G. D. A.; Kumarathunge, D. P. (The Institute of Biology Sri Lanka., 2020-09-25)

Rising temperatures impose heat stress for a wide variety of crops, negatively influencing their growth and development leading to yield losses. Each crop species has its own thermal thresholds at different growth stages ...
Photosynthetic irradiance response, canopy photosynthesis and their variation with canopy strata in tall and dwarf×tall coconut cultivars (Cocos nucifera L.)

Ranasinghe, C.; Kumarathunge, M. D. P.; Costa, W.; Jayaranjini, S. (Elsevier, 2015-06-25)

Estimation of the carbon balance coconut (Cocos nucifera L.) requires characterization of its photosynthetic irradiance response. Accordingly, the objectives of this work were to determine an appropriate photosynthetic ...
The estimation of daily mean soil temperature at different depths in three Agroecological regions of Sri Lanka

Kumarathunge, M. D. P.; Waidyarathne, K. P.; Samita, S. (Coconut Research Institute of Sri Lanka, 2012-12-15)

Soil temperature is an important climatic variable in regulating ecosystem process, yet it is difficult and costly to measure daily. Several mathematical models are available to estimate soil temperature; however, most are ...
Limitation in the use of spectral analysis to detect Weligama coconut leaf wilt disease affected palms in Southern Sri Lanka

Nainanayake, A. D.; Gunathilake, J.; Kumarathunga, M. D. P.; Gunawardena, P. M.; Wijesekara, H. T. R (Coconut Research Institute of Sri Lanka, 2016-11-03)

Weligama Coconut Leaf Wilt Disease (WCLWD) was first reported in late 2006 in the Weligama Divisional Secretariat Division (DSD) in Matara District in the Southern Province of Sri Lanka. Surveys conducted in 2012 revealed ...
A survey of land for Weligama coconut leaf wilt disease affected palms outside the declared boundary in the Southern Province.

Nainanayake, A. D.; Kumarathunga, M. D. P.; De Silva, P. H. P. R. (Coconut Research Institute of Sri Lanka, 2016-11-02)

After the identification ofthe Weligama Coconut LeafWilt Disease (WCLWD) in 2006, a three km wide boundary zone was declared which stretched from Galle to Tangalle. All suspicious palms recorded within the boundary zone ...
Cultivar by environment interaction of coconut under different water and heat regimes at their early stage of growth

Perera, L.; Samarasinghe, C.R.K.; Kumarathunge, D.P.; Dissanayaka, H.D.M.A.C.; Meegahakumbura, M.K. (Pakistan Botanical Society, 2017-04-25)

Four coconut hybrids (brown dwarf x Sri Lanka tall, Sri Lanka tall x brown dwarf, green dwarf x San Ramon and green dwarf x Sri Lanka tall) arising with two parental dwarf coconut varieties; green dwarf and brown dwarf ...
GROWTH PERFORMANCE OF SANDALWOOD DURING NURSERY STAGE AS AFFECTED BY DIFFERENT HOST PLANTS

Drake, J. E.; Vårhammar, A.,; Kumarathunge, D.,; Medlyn, B. E.,; Pfautsch, S.; Reich, P. B.; Tissue, D. T.; Ghannoum, O.; Tjoelker, M. G. (John Wiley & Sons, Inc., 2017-05-23)

Impacts of climate warming depend on the degree to which plants are constrained by adaptation to their climate-of-origin or exhibit broad climatic suitability. We grew cool-origin, central and warm-origin provenances of ...
Genotypic selection approach made successful advancement in developing drought tolerance in perennial tree crop coconut

Samarasinghe, C.; Meegahakumbura, M.; Kumarathunge, D.; Dissanayaka, H.; Weerasinghe, P.; Perera, L. (Elsevier, 2021-09-04)

Coconut (Cocos nucifera L.) is a major plantation crop in humid tropics that affects the socio-economic life of several developing countries. Being a rainfed crop, coconut is highly prone to drought and breeding for drought ...

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