水稻旱涝交替胁迫叠加效应研究进展

在暴雨较多的南方地区,采用节水灌溉后,水稻经常遭受干旱和淹水交替胁迫,现有研究多集中于旱或涝的单独胁迫,而对两种胁迫交替作用对水稻农艺和理化指标的研究较少。对旱、涝及其交替胁迫的研究进展进行了综述,认为交替胁迫的叠加效应,在不同的旱、涝胁迫组合条件下,既可能表现为联合效应,也可能表现为拮抗效应,可能削弱或加强水稻对后继旱涝胁迫的抵抗能力;若合理控制胁迫程度,可对水稻生长和产量产生有利影响。提出了有关旱涝交替胁迫叠加效应的产生机制、影响规律以及适宜水分控制指标阈值与灌排模式等方面需进一步深入研究的问题。

Research advances in pileup effects of drought and waterlogging alternative stress on rice

Alternative stress of drought and waterlogging(ASDW) on rice is common under a water-saving irrigation mode in South China where rainstorms occur frequently.The current studies mainly focus on the effects of single drought or waterlogging rather than the pile-up effects of ASDW on agronomic and physiological traits.This paper summarizes the research progresses of drought and waterlogging stress.The pile-up effects of ASDW can produce antagonistic effects or combined effects under different combinations of drought and waterlogging.Under certain conditions,drought(waterlogging) might strengthen or weaken the resistance of waterlogging(drought) stress in the later stages.Reasonable combination of ASDW can improve grain yield.It is necessary to further study the mechanisms and influence laws of the pile-up effects of ASDW,threshold values of the water control,and irrigation and drainage modes.