砷对小麦种子萌发影响的探讨

Investigation on the Effect of Arsenic on Wheat Seed Germination

以砷对小麦种子萌发的影响进行了研究，结果表明：砷浓度≤７．５ｍｇＬ－１时，对小麦发芽率、芽长的影响不大；砷浓度＞７．５ｍｇＬ－１时，砷浓度与发芽率、芽长呈显著的负相关；砷浓度≥１．０ｍｇＬ－１时，对根长有显著影响，浓度愈大，抑制愈强。砷对根系活力、α－淀粉酶活性有极显著、显著地抑制作用，对呼吸强度亦有抑制趋势。两种价态砷毒性不同，对形态特征的毒性为Ａｓ（Ⅲ）＞Ａｓ（Ⅴ），对生理生化特性的毒性为Ａｓ（Ⅴ）＞Ａｓ（Ⅲ）．

Through studying arsenic effect on winter wheat germination,the results obtained are as follows:with a concentration ≤7.5 mg·L -1 ,arsenic has little influence on germination percentage and bud length,but with arsenic concentration >7.5 mg·L -1 ,a significant negative correlation occurs between the arsenic concentration and the germination percentage and bud length;with arsenic concentration ≥1.0 mg·L -1 ,the effect of arsenic on root length has significant influence,and its inhibition will be stronger when the concentration increases.The inhibition of arsenic on root activity and α amylase activity is very significant or significant,and arsenic also has significant inhibition to respiratory intensity.But the toxic actions of contamination of the two different valences arsenic are different:the toxic action of As(Ⅲ) with morphogical peculiarity is larger than that of As(Ⅴ).On the contrary,the toxic action of As(Ⅴ) with physiological biochemical characters is larger than that of As(Ⅲ).