Abstract - Biochemical Mechanisms Associated with Low Yield During Stress in Hevea Clone RRII 105


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	Publications of MRB Latest Publications MRB Digest Journal of Rubber Research 3^rd Qtr 2008 Vol 11(3) 2^nd Qtr 2008 Vol 11(2) 1^st Qtr 2008 Vol 11(1) 4^th Qtr 2007 Vol 10(4) 3^rd Qtr 2007 Vol 10(3) 2^nd Qtr 2007 Vol 10(2) 1^st Qtr 2007 Vol 10(1) 1^st Qtr 2006 Vol 9(1) 2^nd Qtr 2006 Vol 9(2) 3^rd Qtr 2006 Vol 9(3) 4^th Qtr 2006 Vol 9(4) Submit paper/article Order Form	Abstract Biochemical Mechanisms Associated with Low Yield During Stress in Hevea Clone RRII 105 S. Sreelatha#, Sheela P. Simon, G. Muraleedhara Kurup and K.R. Vijayakumar* Variation in yield, latex physiological parameters, enzymes involved in carbohydrate and thiol metabolism, antioxidant enzymes and enzymes related to cessation of latex flow were studied in clone RRII 105 during peak yielding and low yielding stress (summer) seasons. A significant reduction in dry rubber yield was observed during the stress period compared to the peak yielding season. Latex flow characteristics, metabolism of carbohydrate and thiols, and activities of antioxidant enzymes showed significant variation between seasons. The present study revealed that even though thiol metabolism is activated during stress, decline in cytosolic invertase, superoxide dismutase, catalase and B-serum N-acetyl glucosaminidase activity lead to lower yield during the stress period in clone RRII 105. The significance of these physiological and biochemical parameters are discussed in relation to yield obtained during the peak yielding and stress seasons. back
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