作物水分胁迫补偿效应研究进展

根据国内外水分胁迫补偿效应的研究成果和笔者近年来的试验资料,对水分胁迫补偿效应的研究进展进行了分析和总结.分析结果表明,水分胁迫期间或旱后复水,作物在生长发育、干物质累积以及根系活力、叶绿素浓度、叶片光合作用等方面均可出现补偿效应;补偿程度与水分胁迫程度、胁迫时期和胁迫持续时间有关;营养生长阶段或生殖生长阶段的初期,水分胁迫往往具有较好的补偿效应.论述了光合作用、补偿生长之间的关系,对补偿效应产生的机制进行了初步探讨.提出了在补偿效应的产生条件、变化规律、生理生态机制以及在田间尺度上的效应等方面需要进一步研究的问题.

Advances in compensatory effects response to water stress

A summary was made on the development of research on the compensatory effects of water stress based on an analysis of predecessors' research work and authors' experimental result.It is indicated that the compensatory effects on the growth,dry matter accumulation,root activity,chlorophyll content,and photosynthesis rate of crops are likely to appear during the period of water stress or water recovery after water stress,that the degree of compensation depends on the stress intensity,the stress stage,and the duration of stress,and that the water stress during the vegetative period or the early reproductive period of crops often results in better compensatory effects.Furthermore,the relationships between photosynthesis,root activity,and compensatory growth of plants were discussed for investigation of the mechanism of compensatory effects.Finally,some issues for further study about the generation of the compensatory effects and their regularities and physiological and ecological mechanism as well as compensatory effects in field scale were proposed.