植物气孔气态失水与SPAC系统液态供水的相互调节作用研究进展

被引：13

作者：

刘利民

齐华

罗新兰

张旋

机构：

[1] 沈阳农业大学

来源：

应用生态学报 | 2008年 / 09期

关键词：

植物气孔; 水力信号; 等水行为; 午休现象; 木质部气穴; 气穴逆转;

D O I：

10.13287/j.1001-9332.2008.0341

中图分类号：

Q945.78 [协迫生理学];

学科分类号：

0903 ;

摘要：

讨论了植物气孔气态失水与SPAC系统液态供水相互作用研究领域的一些重要现象和行为.当植物水力信号和化学信号共同作用促进气孔对叶水势的调节时,植物对叶水势的调节表现为等水行为.气孔对环境湿度变化响应的反馈机制可用来解释土壤干旱条件下气孔和光合的午休现象,以及气孔导度和水流导度之间的相关关系;而气孔对环境湿度变化响应的前馈机制,则可用来解释气孔导度对大气-叶片间水汽饱和差的滞后反应.植物最大限度地利用木质部传输水分的策略,要求气孔快速响应以避免木质部过度气穴化和短时间内将气穴逆转的相应机制.

引用

页码：2067 / 2073

页数：7

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