【摘要】 经分析认为，作物抗旱性只是人们对植物适应各种干旱环境的通俗概括，并不是一个严格意义上的科学术语或概念。半干旱地区，水的时空有效性与作物生长时期的不协调是作物不能实现其全部产量潜力的主要限制因素。提高作物个体的干旱适应能力将导致作物群体产量的降低。因此，要获得较高的产量，首先就要求作物品种在生长、发育及产量形成期，特别是敏感时期，能够避开干旱周期，以减少水分亏缺对作物生长与产量形成的胁迫作用；其次是剔除个体数量性状的冗余、提高收获指数和水分利用效率。通过此两项措施，可望获得半干旱地区作物生产的更大成效更多还原

【Abstract】 Based on analysis of previous researches on plant drought resistance,the study raises that the drought resistance of crops is only a popular summary for adaption of plants to various drought environments rather than a scientific terminology or conception.In semiarid areas,non match of the temporal spatial availability of water resources with the crop growing period is the key restrictive factor for failture in realizing complete crop yield potentiality.The fitness increase of individual plant will cause the reduction of communal plants.Therefore,for a higher grain output,the growth,development and formation of grain yield should escape from drought period,especially in susceptible period to water deficit stress.And the redundancy of plant characteristics should be removed in order to improve harvest index and water use efficiency.By this way,it will be helpful to improve crop production efficiently in semiarid areas.更多还原