植物干旱胁迫对植食性昆虫及其天敌的影响

全球正经历以变暖为主要特征的气候变化,由此带来的干旱将对农业生态系统造成重要影响。本文综述了干旱胁迫下寄主植物对植食性昆虫及其天敌影响的国内外最新研究进展。在干旱胁迫下,寄主植物物理性状、营养状况和次生代谢物质等均发生变化,这些变化导致植食性昆虫的生存环境和营养物质的获取等方面发生改变,从而影响了害虫生长发育和种群动态。干旱胁迫还导致寄主物候变化与昆虫发生不同步,使害虫缺乏食物。另外干旱也会引起植食性害虫天敌的种群发生变化,从而对植食性昆虫种群数量产生间接的影响。

Minireview on the influences of drought stress on herbivores and their natural enemies

Drought happened with the climate change characterized by global warming may greatly affect the agro-ecosystem,especially,the influences of host plants under drought stress on the insects and their natural enemies in direct and indirect ways were associated closely with the population dynamics of herbivores.Under drought stress,host plants could be modified in physical characters,nutritional status,and secondary chemical substances which may strongly affect the herbivore development and population dynamics by changes in habitats and availability of nutrition of herbivores.Phenological shift which desynchronized on the changes between host plants and herbivores induced by drought stress could result in a shortage in food supplies for herbivores.The population dynamics of herbivores also could be affected indirectly by the dynamics of natural enemies modified by drought stress.