حامض السلسليك يقلل سمية الرصاص بدلالة استجابة تجذير عقل الماش Phaseolus aureus Roxb. الطرية

Abstract

The present study explores alleviatory effects of salicylic acid on the toxicity of lead (Pb), in terms of rooting response of fresh mung bean cuttings via indole acetic acid (IAA) level. The data revealed, significant increase in rooting response of fresh cuttings at (100 , 150ppm) in PbCl2 solution. While, high concentration (500ppm) revealed significant decrease in rooting response compared to fresh cuttings treated in d/H2O (control). On the other hand, the data revealed, significant increase in rooting response of fresh cuttings at (25ppm), in salicylic acid (SA) . Interaction between (Pb) at high concentration (500 ppm) and (SA) at varying levels revealed, significant increase in rooting response at follow combinations (Pb, 500+SA,0.01), (Pb, 500+SA,0.1), (Pb, 500+SA, 1) and (Pb, 500+SA, 50) ppm . Quantitative estimation of IAA by spectrophotometric method as indicator for oxidative processes that occurs during stress phenomenon verified significant increase of IAA content in hypocotyls of cuttings treated with low concentration and significant decrease in hypocotyls of cuttings treated with high concentration.