铬胁迫对辣椒幼苗生长和生理生化特性的影响

目的]探讨铬胁迫对茄果类蔬菜的毒害机理。方法]通过水培试验,研究0(对照)、5、10、20、50和100 mg/L的K2Cr2O7Cr溶液对辣椒幼苗生长和生理的影响。结果]随着Cr6+浓度的升高,辣椒幼苗的生长受到了明显的抑制,株高、根部和地上部的鲜重、干重显著降低,根冠比(干重)呈升高趋势,叶绿素含量、叶绿素a/b值呈下降趋势,细胞膜透性大幅度增大,丙二醛(MDA)含量显著升高,超氧化物歧化酶(SOD)活性下降,过氧化物酶(POD)活性先上升后下降。Cr6+浓度与根部和地上部的干重、叶绿素a含量均呈极显著的负相关,与叶绿素b含量呈显著的负相关。结论]辣椒幼苗对低浓度的Cr6+具有一定的抵抗作用。

Effect of Chromic Stress on Growth and Physiology of Pepper Seedlings

Objective] The purpose was to discuss the toxicity mechanism of chromic stress(Cr Stress) on solanaceous vegetable.Method] Through water cultivation test,the effect on growth and physiology of pepper seedling by using 0(CK),5,10,20,50 and 100 mg/L of K2Cr2O7Cr solution was studied.Result] The growth of pepper seedling was inhibited obviously with the increasing of concentration of Cr6 ,the fresh and dry weight of plant height,root and aerial part were decreased significantly,the root-shoot ratio(dry weight) showed raising tendency and chlorophyll content and chlorophyll a/b value had dropping trend,the cell membrane permeability increased greatly,malondialdehyde(MDA) content increased remarkably,the activity of superoxile dismutase(SOD) reduced,peroxidase(POD) activity risen up first and then dropped down.Cr6 concentration had a significant negative correlation with all the dry weight of root and aerial part and content of chlorophyll a,and also presented a obvious negative correlation with the content of chlorophyll b.Conclusion] Pepper seedling had a certain resistant function to Cr6 with low concentration.