作物学报2025，Vol.51Issue(5)：1299-1311,13.DOI:10.3724/SP.J.1006.2025.33074
乙烯利-甜菜碱-水杨酸合剂对夏玉米耐热性和产量的调控效应
Effect of ethephon betaine salicylic acid mixture on heat resistance and yield of summer maize
摘要
Abstract
High-temperature stress has become a major constraint on summer maize production in the North China Plain(NCP).Enhancing maize heat tolerance is therefore essential for ensuring stable yields in this region.This study investigated the effects of an ethephon-glycine betaine-salicylic acid(EGS)mixture on the thermal response,morphological traits,and yield of summer maize,as well as the underlying mechanisms.Two maize hybrids,Zhengdan 958(ZD958)and Yudan 9953(YD9953),were evaluated using a randomized block design with three treatments:normal temperature(CK),high-temperature stress(HT),and high-temperature stress with chemical treatment(TR).For the TR treatment,EGS was applied via foliar spraying at the V6 growth stage,while water was sprayed in the CK and HT treatments.In 2021,high-temperature stress was imposed during the V8,V12,and VT stages,whereas in 2022,stress occurred at the V9 and VT stages.The results showed that compared to CK,HT treatment had no significant effect on plant height or ear height,but reduced leaf area by 3.6%.Under TR treatment,plant height,ear height,and leaf area decreased by 10.9%,11.9%,and 7.3%relative to CK,respectively.However,TR treatment increased the leaf net photosynthetic rate by 6.3%and 16.8%compared to CK and HT,respectively.TR also improved leaf heat tolerance,en-hanced dry matter accumulation,and stimulated root development under high-temperature stress.Specifically,TR treatment in-creased leaf SOD activity,POD activity,soluble protein content,plant biomass,and root biomass by 6.6%,17.5%,15.2%,11.0%,and 16.3%,respectively,compared to HT.Additionally,the grain yield of ZD958 and YD9953 under TR treatment was compara-ble to CK but increased by 14.8%and 14.2%,respectively,compared to HT.Correlation and regression analyses further revealed that yield was closely associated with plant and root biomass.In conclusion,foliar application of the EGS mixture enhanced can-opy biomass production and root development under high-temperature stress,mitigating yield losses.This provides a promising strategy for improving heat tolerance and sustaining maize yields in the NCP.关键词
乙烯利-甜菜碱-水杨酸合剂/夏玉米/高温/热形态建成/产量Key words
ethephon betaine salicylic acid mixture/summer maize/high-temperature stress/heat resistance/grain yield引用本文复制引用
孟凡琦,张凤路,房孟颖,罗艺,卢霖,董学瑞,王亚菲,郭丽娜,闫鹏,董志强..乙烯利-甜菜碱-水杨酸合剂对夏玉米耐热性和产量的调控效应[J].作物学报,2025,51(5):1299-1311,13.基金项目
本研究由国家自然科学基金项目(32101858,32071961)资助. This study was supported by the National Natural Science Foundation of China(32101858,32071961). （32101858,32071961）
