壳寡糖缓解小麦镉毒害的某些生理特性研究

利用不同浓度壳寡糖溶液对小麦种子浸种,种子萌发后,对小麦幼苗进行Cd胁迫,研究了不同浓度的壳寡糖对小麦幼苗生长、超氧化物歧化酶(SOD)、过氧化物酶(POD)和过氧化氢酶(CAT)等抗氧化酶活性的影响。结果表明:不同浓度壳寡糖浸种,对镉胁迫下小麦幼苗生长有促进作用,幼苗高度、根长、生物量均有增加;幼苗叶片中叶绿素含量增高;SOD、POD和CAT活性增加。随着镉胁迫时间的延长,SOD和CAT活性降低,但降低幅度小于对照;POD活性却表现增加,增加的幅度大于对照。壳寡糖不同浓度之间比较,低浓度壳寡糖对镉毒害的缓解效果优于高浓度。说明壳寡糖预处理对镉胁迫有缓解作用。

Physiological Characters of Oligochitosan on Alleviating Cd Toxicity of Wheat Seedling

Effects of different concentrations of oligochitosan were studied on seedling growth and antioxidative activities of wheat seedling stressed by Cd, under wheat seeds soaked in different concentrations of oligochitosan solution. Results indicated that under the treatment of different oligochitosan concentrations, the height of seedling increased, root length elongated as well as Chl a content, SOD, POD and CAT activities increased, which were stressed by Cd. When time stressed by Cd prolonged, SOD and CAT activities decreased, but the degree of decreasing was lower than that of the control. Nevertheless, POD activity increased and degree of increase was higher than that of the control. Alleviation effect of low concentration oligochitosan was better than that of high concentration oligochitosan, which indicated that different concentrations of oligochitosan could alleviate the toxicity of Cd.