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作 者 ：李凤民,鄢 xun,郭安红,山仑

期 刊 ：生态学报 2000年 20卷 3期 页码：510~513

关键词：生活史对策；非水力根信号；作物产量；选择压力；麦类作物；

Keywords:life history strategy, non hydraulic root signal, grain yield, selection pressure, wheat,

摘 要 ：从植物非水力根信号的生理调节作用和生活史进化角度看 ,在水分亏缺条件下 ,自然选择会导致植物产生大量根系以增加对水分的竞争能力 ,而浅根系则可在干旱来临时 ,以快速反应的根信号来调节和平衡植株水分状况 ,度过干旱时期。但是 ,自然选择压力下的植物特征往往不利于作物籽粒产量这一种群水平上的属性的改善。作物产量的提高过程是一个不断加强的人工选择过程。在作物生产中 ,作物水环境得到了改善 ,强大的多年生竞争者基本消失 ,为强化人工选择力度 ,提高作物产量 ,麦类作物的根信号作用应当有所消弱。据此提出了在黄土高原农田环境下 ,麦类作物根系的理想分布应当是深而窄幅的形式。

Abstract:From the point of view of physiological regulation of root sourced signals and life history strategy,natural selection in water deficit environment would result in a large root system in which many lateral roots would play a very important role in the relation of plant water balance.The rapid response of root sourced signals would occure based on the larger root systems for the coming drought.The natural selection,however,is not a favorable mecharism to improve the characteristics of grain yield.The incr...

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