湖南农业科学Issue(7)：11-17,7.DOI:10.16498/j.cnki.hnnykx.2025.007.003
增氧条件下氮肥后移对水稻茎秆抗逆特性的影响
Effects of Postponed Nitrogen Application on Stress Resistance of Rice Stems Under Oxygation Conditions
摘要
Abstract
This study aims to investigate the effects of postponed nitrogen(N)application under oxygation conditions on antioxidant enzyme activities and osmotic regulation substances in rice stems.A pot experiment was conducted with the rice cultivar'Taoyou Yuzhen'.Two irrigation methods were applied:oxygation(O)and conventional irrigation(CK).Five postponed N application treatments were designed based on the mass ratio of basal fertilizer∶tillering fertilizer∶panicle fertilizer,namely F1(5∶5∶0),F2(5∶3∶2),F3(4∶4∶2),F4(4∶3∶3),and F5(3∶3∶4).The activities of superoxide dismutase(SOD)and catalase(CAT),the content of soluble sugar(SS)and malondialdehyde(MDA),the number of tillers,and the dry matter weight in rice stems were measured at the tillering,jointing,and grain-filling stages.The results showed that the activities of SOD and CAT in rice stems followed the order of OF>CKF across different growth stages.Postponed N application enhanced SOD and CAT activities in rice stems at the same N application level.Specifically,the SOD activity in OF5 increased significantly by 25.8%,31.6%,and 16.7%compared with that in OF1,OF2,and OF3,respectively,while the CAT activity in OF5 increased significantly by 23.8%and 29.9%compared with OF1 and OF2,respectively.From the tillering to grain-filling stages,the content of SS and MDA in rice stems showed a gradual increasing trend.The SS content followed the trend of OF>CKF across all stages,being the highest in OF5 at the grain-filling stage.Conversely,the MDA content followed the trend of OF<CKF,being the lowest(28.44 nmol/g)in OF5 at the grain-filling stage.Postponed N application increased the number of tillers and dry matter accumulation in rice stems.The OF5 treatment achieved the maximum number of tillers and dry matter weight at the grain-filling stage,with the dry matter weight increasing by 15.8 times compared with that at the tillering stage.In conclusion,postponed N application enhanced rice stress resistance.Within the experimental design,OF5(3∶3∶4)was most effective in improving the activities of antioxidant enzymes,promoting the synthesis and accumulation of soluble sugar,and reducing the production of MDA in rice stems.关键词
水稻/增氧灌溉/氮肥后移/抗逆性Key words
rice/oxygation/postponed nitrogen application/stress resistance分类
农业科技引用本文复制引用
赵毅斐,许鸿昌,胡涛,李静,洪曦,肖卫华..增氧条件下氮肥后移对水稻茎秆抗逆特性的影响[J].湖南农业科学,2025,(7):11-17,7.基金项目
国家自然科学基金(51909088) （51909088）
郴州国家可持续发展议程创新示范区建设省级专项(2023sfq03) （2023sfq03）
湖南省水利科技一般项目(XSKJ2021000-42) （XSKJ2021000-42）
湖南省农业科技创新资金(2024CX40) （2024CX40）
