干旱胁迫下丛枝菌根真菌对草莓根系生长的影响

摘要

[Objective]To study the effectes of inoculating arbuscular mycorrhizal fungi (AMF) on root growth of strawberry under drought stress.[Method]Strawberry cultivar "Sweet Charlie" was selected as test cultivar,and Glomus mosseae was the tested arbuscular mycorrhizal fungi,the non-inoculated strawberryy was taken as the control.The root growth changes of strawberry were measured under three different levels of water (normal irrigation,mild drought stress,moderate drought stress).[Result]AMF colonization rate decreased rapidly with the increase of drought stress,while AMF dependency increased with the rise of drought stress.Under the drought stress,AMF inoculation changed the root morphology of strawberry and increased root fresh and dry weight of strawberry.The root antioxidant enzymes activities of strawberry were also improved significantly.Thus the damages of drought stress on the root of strawberry were alleviated.[Conclusion]AMF inoculation improved the drought resistance of strawberry.The results provided the theoretical basis for AMF's application in strawberry drought resistance research.%[目的]研究干旱胁迫下丛枝菌根真菌(AMF)对草莓根系生长的影响.[方法]以"甜查理"草莓为供试品种,以接种摩西球囊霉菌根(Glomus mosseae)为处理,不接种为空白对照,分别在正常供水、轻度干旱胁迫、中度干旱胁迫3种水分条件下观测草莓根系生长的变化.[结果]随着干旱胁迫的加重,菌根侵染率迅速下降,菌根依存度随着干旱胁迫的加重而上升.在干旱胁迫下,接种AMF可以改变草莓根系形态,增加草莓根系干鲜重,提高草莓根系抗氧化酶活性,从而缓解干旱胁迫对草莓根系造成的伤害.[结论]接种AMF提高了草莓的耐旱性.试验结果可为将AMF应用于草莓耐旱性研究提供理论依据.