农业科技与技术（英文）2025，Vol.26Issue(4)：12-21,10.DOI:10.16175/j.cnki.1009-4229.2025.04.002
增氧条件下氮肥后移对水稻茎秆抗逆特性的影响
Effect of Postponed Nitrogen Fertilization on Stress Resistance of Rice Stems Under Aerated Irrigation
摘要
Abstract
To investigate the effect of postponed nitrogen(N)fertilization under aerated irrigation on antioxidant enzyme activities and osmotic regulation substances in rice stems,a pot experiment was conducted with the rice cultivar'Taoyou Yuzhen'as material.The experiment was carried out with two irrigation methods[aerated(O)and conventional(CK)irrigation]and five postponed N fertilization treatments designed based on the mass ratio of basal fertilizer∶tillering fertilizer∶panicle fertilizer[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),content of soluble sugar(SS)and malondialdehyde(MDA),number of tillers,and 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>CKF across different growth stages.Postponed N fertilization enhanced SOD and CAT activities.Specifically,OF5 showed significant increases of 25.8%,31.6%,and 16.7%in SOD activity compared with OF1,OF2,and OF3,respectively,while it showed significant increases of 23.8%and 29.9%in CAT activity 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 OF>CKF across all stages,with OF5 exhibiting the highest SS content at the grain-filling stage.Conversely,MDA content followed OF<CKF,with OF5 showing the lowest value(28.44 nmol/g)at the grainfilling stage.Postponed N fertilization increased the number of tillers and dry matter accumulation at later growth stages.The OF5 treatment achieved the maximum number of tillers and dry matter weight at the grain filling-stage,with the dry matter weight being 15.8 times of that at the tillering stage.In conclusion,postponed N fertilization enhanced rice stress resistance during late growth stages.Within the experimental design,OF5(3∶3∶4)was the most effective in improving antioxidant enzyme activities,promoting SS synthesis,and reducing MDA accumulation in rice stems at the grain-filling stage.关键词
水稻/增氧灌溉/氮肥后移/抗逆性Key words
Rice/Aerated irrigation/Postponed nitrogen application/Stress resistance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].农业科技与技术（英文）,2025,26(4):12-21,10.基金项目
Supported by National Natural Science Foundation of China(51909088) （51909088）
Provincial-level Special Project for National Sustainable Development Agenda Innovation Demonstration Zone in Chenzhou(2023sfq03) （2023sfq03）
General Project of Water Conservancy Science and Technology of Hunan Province(XSKJ2021000-42) （XSKJ2021000-42）
Agricultural Science and Technology Innovation Fund Project of Hunan Province(2024CX40). 国家自然科学基金项目(51909088) （2024CX40）
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项目(2024CX40) （2024CX40）
