玉米苗期叶片主要生理生化指标对土壤水分的响应

被引：28

作者：

张淑勇 ^{[1
]}

国静 ^{[2
]}

刘炜 ^{[1
]}

赵京考 ^{[1
]}

谷思玉 ^{[1
]}

机构：

[1] 东北农业大学资源与环境学院

[2] 东北林业大学盐碱地生物资源环境研究中心/东北油田盐碱植被恢复与重建教育部重点实验室

来源：

玉米科学 | 2011年 / 19卷 / 05期

关键词：

玉米; 生理生化指标; 叶绿素; 脯氨酸; 丙二醛;

D O I：

10.13597/j.cnki.maize.science.2011.05.006

中图分类号：

S513 [玉米（玉蜀黍）];

学科分类号：

0901 ;

摘要：

以玉米品种龙单57为试验材料,通过人为供水和自然耗水相结合的方法获得多级土壤水分梯度,探究其生理生化指标(叶绿素、脯氨酸、可溶性糖及丙二醛)对土壤水分的响应规律。结果表明,玉米叶绿素含量对土壤水分(SWC)的变化具有阈值响应,维持玉米叶片叶绿素含量较高水平的SWC范围在15.2%～25.6%,相对含水量(RWC)为51.6%～87.2%,SWC在20.4%左右是对玉米叶片叶绿素含量有效性最高的土壤水分。随着水分胁迫程度的增加,脯氨酸累积量和可溶性糖含量总体上均呈现上升趋势,表明脯氨酸和可溶性糖为玉米的主要渗透调节物质,但在不同的水分条件下,增加的幅度有所差异。丙二醛含量随着土壤含水量的减少呈现先减少后增多的趋势,SWC>17%时丙二醛的含量变化不明显,SWC<17%时丙二醛的含量随着水分胁迫程度的加重急剧上升,叶片质膜膜脂过氧化作用也随之加剧。

引用

页码：68 / 72+77 +77

页数：6

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