干旱胁迫下维生素C对玉米幼苗生长的影响

［目的］揭示维生素C对增强玉米植株抗旱性的作用,为玉米田间施用维生素C提供参考依据。［方法］用不同浓度的维生素C对干旱胁迫下的玉米幼苗进行处理，测定玉米幼苗的形态指标 （叶片长度、植株高度、鲜重、干重和相对含水量）和生理指标［叶绿素含量和过氧化物酶（POD）、超氧化物歧化酶（SOD）活性］。［结果］一定浓度的维生素C对玉米幼苗各项指标都产生了明显的影响。在浓度为40 mg/L时，其效果较明显，形态指标叶片长度、植株高度、鲜重、干重和相对含水量分别比对照组上升了4.6%、12.9%、20.8%、20.0%和20.3%;生理指标叶绿素含量和POD、SOD活性也分别比对照组上升了75.6%、24.6%和23.4%。［结论］维生素C可以提高植物体内的水分含量，并在一定程度上调节酶的活性，对细胞膜起到一定的保护作用，提高了玉米的抗旱性。

Effect of Vitamin C on Maize Seedling Growth under Drought Stress

Objective] The reference for the application of vitamin C in maize growth was provided through the research on the resistance-strengthening of maize plant to drought under the treatment of vitamin C.Method] The maize seedling under drought stress was treated with different concentrations of vitamin C and the morphological indicator of maize seedling(leaf length,plant height,fresh weight,dry weight and content of relative water) and the physiological indicatorscontent of chlorophyll and activity of peroxi...