外源海藻糖对盐胁迫下玉米幼苗根系生长及生理特性的影响

Root growth and physiological characteristics of salt-stressed maize seedlings in response to exogenous trehalose

为了探讨施加外源海藻糖对盐胁迫下玉米幼苗根系生长及生理特性的影响,以玉米品种郑单958为材料,采用水培法,利用1/2Hoagland营养液配制不同浓度海藻糖,分析150 mmol/L NaCl胁迫条件下玉米幼苗根系的变化。结果表明,盐胁迫下,玉米幼苗根系鲜质量、干质量、根总长度、根表面积以及根体积均显著下降,与对照相比,分别下降37.21%、35.71%、35.78%、34.33%和40.42%。不同浓度海藻糖处理后,幼苗根系生长量、相对含水量和根系活力显著提高,MDA含量、H_2O_2含量以及O_2^(·-)产生速率显著降低。其中以10 mmol/L藻糖处理效果最好。说明适宜浓度的海藻糖可以提高盐胁迫下玉米幼苗根系的抗盐性,缓解盐胁迫对玉米幼苗的伤害。

To investigate the effects of exogenous trehalose on the root growth and physiological characteristics of maize seedling under salt stress,maize variety Zhendan958 was applied with different concentrations of trehalose to analyze the response of seedling root system under the stress of 150 mmol/L NaCl by hydroponic experiment.The fresh weight,dry weight,total length,surface area and volume of maize seedling roots decreased significantly under salt stress by 37.21%,35.71%,35.78%,34.33% and 40.42% respectively.With the applications of trehalose of different concentrations,the growth,relative water content and root vitality of maize seedling root were increased,and the contents of MDA and H_2O_2 and OO_2^(·-) generating rate reduced.The concentration of 10 mmol/L trehalose showed the best effect.This indicated that approapriate concentration of trehalose could improve the salt tolerance of maize seedlings and alleviate the damage caused by salt stress.