Abstract - Physiological and Nutritional Aspects in Relation to the Spontaneous Development of Tapping Panel Dryness in Clone PB 260


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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 Physiological and Nutritional Aspects in Relation to the Spontaneous Development of Tapping Panel Dryness in Clone PB 260 S. Sivakumaran, H. Ghandimathi, Zainab Hamzah, Faridah Yusof, Samsidar Hamzah and H.Y. Yeang The changes in several physiological and nutritional parameters were investigated in relation to the spontaneous development of tapping panel dryness in clone PB 260. These parameters were monitored at regular intervals on sixty core trees over a period of twenty-three months. Dryness developed in several trees irrespective of their initial latex yield. Among the latex physiological parameters studied significant differences between dry and normal trees were recorded for four parameters viz. bottom fraction volume, inorganic phosphorus, proline and free magnesium. However detailed examination of these parameters preceding onset of partial dryness on the cut in affected trees did not show any distinct pattern or trend that could serve as a consistent and reliable early warning of the impending onset of dryness. Changes in the concentration of macro- and micro-nutrients in both latex and bark tissue did not show marked differences between normal and dry trees, but a significant increase in tylosis was recorded in latex vessels of dry trees. back
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