Abstract - Tapping-induced Changes in Respiratory Metabolism, ATP Production and Reactive Oxygen Species Scavenging in Hevea


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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 Tapping-induced Changes in Respiratory Metabolism, ATP Production and Reactive Oxygen Species Scavenging in Hevea Rate of dark respiration was measured in the soft bark tissues of untapped and tapped trees of Hevea brasiliensis. The respiration rate increased after tapping and decreased when the trees were given tapping rest. Concomitant with increase in respiration, tapped trees also showed increased activity of reactive oxygen species scavenging enzymes such as superoxide dismutase, catalase and peroxidase in the soft bark tissues. Tapping significantly increased the rate of cyanide resistant alternative respiration. The latex (C-serum) of tapped trees contained a high amount of ATP, indicating that the metabolically activated tapped trees produced large amounts of ATP in the serum and the excess ATP molecules were lost through the serum. This excess loss of ATP and enhanced alternative respiration may partially explain the tapping induced loss of shoot hiomass which was not reflected in the dry rubber yield.
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