【摘要】 [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。更多还原

【Abstract】 [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 indicators[content of chlorophyll and activity of peroxidase(POD) and superoxide dismutase(SOD)] were tested.[Results] All kinds of indicators of maize seedling could be significant impacted by the treatment of vitamin C.At the concentration of 40 mg/L,the effect was obvious and the morphological indicators such as leaf shape length,plant height,fresh weight,dry weight and content of relative water were 4.6%,12.9%,20.8%,20.0% and 20.3% more than that of the control group,respectively;and the physiological indicators including the content of chlorophyll and the activity of POD and SOD were 75.6%,24.6% and 23.4% higher than that of the control group,respectively.[Conclusion] The treatment of vitamin C could increase the moisture content in plants;to some extent,regulate the enzyme activity;played a role in the protection of the cell membrane and improve the resistance of maize plant to drought.更多还原