Abstract - Wound-induced Differentiation in Hevea brasiliensis Shoots Mediated by Jasmonic Acid


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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 Wound-induced Differentiation in Hevea Brasiliensis Shoots Mediated by Jasmonic Acid The effects of mechanical wounding on laticifer differentiation in Hevea brasiliensis were investigated by using the young stems in epicormic shoots. Light wounding by scraping to break the epidermal cells of young stem usually caused the formation of a line of secondary laticifers in the area roughly equal to that of the wound. More laticifers formed in a larger area in response to heavier wounding, such as that caused by deep scraping to remove part of cortex tissues of young stem or by cutting its bark into xylem. The first laticifers induced by scraping and cutting were visible as early as 6 days after wounding. The induction of laticifer differentiation by wounding in young stem was enhanced by the application of jasmonic acid and linolenic acid, whereas induction was hindered to different degrees by the application of diethyldithiocarbamic acid and nordihydroguaiaretic acid, which are inhibitors of jasmonate biosynthesis. Together with other evidence, these observations indicate that laticifer differentiation upon wounding is mediated by jasmonates. The involvement of jasmonates in wound morphogenesis is discussed.
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