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《中国工程科学》 >> 2012年 第14卷 第3期

低水多变环境下玉米叶片的光合与反射光谱特征

1. 黄土高原土壤侵蚀与旱地农业国家重点实验室,陕西杨凌 712100;

2. 淮北师范大学生命科学学院,安徽淮北 235000

资助项目 :黄土高原土壤侵蚀与旱地农业国家重点实验室开放基金(10501-277) 收稿日期: 2011-11-17 发布日期: 2012-03-13 14:32:30.000

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摘要

采用盆栽试验,以玉米品种苏玉19为试材,在每次复水第7天同时测定不同处理植株的生物量、根冠比、叶绿素荧光、气体交换以及光谱特征等指标。结果表明,持续干旱处理抑制植株生长,增加根冠比,并通过气孔限制和非气孔限制因素抑制光合作用。持续干旱处理幼苗的mSR705、chlNDI和REP均显著小于对照,但对SIPI的影响不显著。多变低水环境下玉米幼苗生长明显受到抑制,但根冠比、叶绿素荧光、气体交换以及光谱特征等指标与正常供水没有差异。可见,生物量分配、光合作用和光谱特征的维持可能是玉米适应多变低水环境的重要生理机制。

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