Foliar application of strigolactones improves the desiccation tolerance,grain yield and water use efficiency in dryland wheat through modulation of non-hydraulic root signals and antioxidant defense  

作　　者：Sha Guo Xiaofei Wei Baoluo Ma Yongqing Ma Zihan Yu Pufang Li 

机构地区：[1]College of Forestry,Northwest A&F University,Shaanxi 712000,Yangling,China [2]College of Soil and Water Conservation Science and Engineering,Northwest A&F University,Shaanxi 712000,Yangling,China [3]Ottawa Research and Development Centre(ORDC),Agriculture and Agri-Food Canada,Ottawa,ON K1A0C6,Canada [4]College of Natural Resources and Environment,Northwest A&F University,Shaanxi 712000,Yangling,China

出　　处：《Stress Biology》2023年第1期583-597,共15页逆境生物学（英文）

基　　金：financially supported by the National Key Research and Development Program of China(2022YFF1302804);the National Natural Science Foundation of China(31901123).

摘　　要：Non-hydraulic root signals(nHRS)are affirmed as a unique positive response to soil drying,and play a crucial role in regulating water use efficiency and yield formation in dryland wheat production.Strigolactones(SLs)can enhance plant drought adaptability.However,the question of whether strigolactones enhance grain yield and water use efficiency by regulating nHRS and antioxidant defense systems in dryland wheat remains unanswered.In this study,pot experiments were conducted to investigate the effects of strigolactones on nHRS,antioxidant defense system,and grain yield and water use efficiency in dryland wheat.The results showed that external application of SLs increased drought-induced abscisic acid(ABA)accumulation and activated an earlier trigger of nHRS at 73.4% field capacity(FC),compared to 68.5%FC in the control group(CK).This phenomenon was mechanically associated with the physiological mediation of SLs.The application of SLs significantly enhanced the activities of leaf antioxidant enzymes,reduced ROS production,and mitigated oxidative damage to lipid membrane.Additionally,root biomass,root length density,and root to shoot ratio were increased under strigolactone treatment.Furthermore,exogenous application of SLs significantly increased grain yield by 34.9%under moderate drought stress.Water use efficiency was also increased by 21.5% and 33.3% under moderate and severe drought conditions respectively,compared to the control group(CK).The results suggested that the application of strigolactones triggered earlier drought-sensing mechanism and improved the antioxidant defense ability,thus enhancing grain yield and water use efficiency in dryland wheat production.

关 键 词：STRIGOLACTONES Non-hydraulic root signals Antioxidant defense system Grain yield Water use efficiency 

分 类 号：S512.1[农业科学—作物学]