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Assessing Growth and Physiological Parameters of Young Hevea brasiliensis to Identify Adaptable Clones for WL1a Agroecological Region in Sri Lanka

Authors:

A. A. A. Nadeeshani ,

University of Ruhuna, LK
About A. A. A.
Department of Crop Science, Faculty of Agriculture
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I. R. Palihakkara,

University of Ruhuna 0000-0003-0347-719x, LK
About I. R.
Department of Crop Science, Faculty of Agriculture
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K. V. V. S. Kudaligama

Rubber Research Institute of Sri Lanka, LK
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Abstract

The rubber (Hevea brasiliensis) industry plays an important economic role in Sri Lanka. Expansion of rubber cultivation is very important for the increase in production. In general, the performance of a crop varies with the environment and thus the climatic conditions greatly affect the physiological and growth performance of the rubber plant. In this regard, factors such as rainfall, temperature, wind, humidity and characteristics of the soil are extremely important. Rubber requires a considerable period before giving its potential yield and hence, the identification of high yielding clones is a time-consuming process. Therefore, having an approach in identifying elite clones at early stages is important in predicting the yield. In this regard, RRIC 100, RRIC 121, RRISL203 and RRISL 2001 clones were selected in Dartonfield experimental site situated in WL1a agroecological zone. Poly-bagged budded plants were planted in a Randomized Complete Block Design with four replicates and their performance was monitored using vegetative growth parameters and physiological parameters for three years. The results revealed that there was a negative relationship between stomatal conductance and wind speed of four Hevea genotypes during the morning and evening periods. Also, the clones other than RRIC 100 had shown a positive relationship between stomatal conductance and air temperature. There was a clear positive relationship between stomatal conductance and relative humidity in RRIC 121, RRIC 100 and RRISL 203 clones during morning and evening times. The stomatal conductance of all four clones was negatively related to soil moisture content. The performance of RRISL 2001 showed better growth among all four clones followed by RRIC 121. With regards to plant physiological status, RRIC 121 and RRISL203 showed better performance in terms of leaf epicuticular wax content and chlorophyll content and hence, they could be more tolerable in dry climates.
How to Cite: Nadeeshani, A.A.A., Palihakkara, I.R. and Kudaligama, K.V.V.S., 2021. Assessing Growth and Physiological Parameters of Young Hevea brasiliensis to Identify Adaptable Clones for WL1a Agroecological Region in Sri Lanka. Journal of Food and Agriculture, 14(2), pp.17–31. DOI: http://doi.org/10.4038/jfa.v14i2.5261
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Published on 28 Dec 2021.
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