江苏农业学报2025，Vol.41Issue(8)：1475-1483,9.DOI:10.3969/j.issn.1000-4440.2025.08.003
外源植物生长调节剂对高温胁迫下水稻颖花分化及退化的影响
Effects of exogenous plant growth regulators on spikelet differentiation and degeneration in rice under high temperature stress conditions
摘要
Abstract
The panicle differentiation stage of rice is a critical period for yield formation.Extreme high tem-peratures during this stage can severely threaten spikelet development and yield stability.In this study,utilizing natural high-temperature conditions,rice varieties Nanjing 9108 and Ningxiangjing 9 were used as materials.During the young panicle differentiation stage,exogenous plant growth regulators,namely S-abscisic acid(ABA),2,4-epibrassinolide(BL),and methyl jasmonate(MeJA),were sprayed twice,with clear water spraying set as the control(CK).The effects of exogenous plant growth regulators on rice spikelet differentiation,degeneration,and yield component characteristics were investigated.The results showed that under high-temperature conditions during the panicle differentiation stage,compared with the control,ABA,BL,and MeJA treat-ments significantly increased the number of differentiated spikelets per panicle,spikelet survival rate per panicle,and the grain density of Nanjing 9108(P<0.05),while significantly reducing the number of degenerated spikelets per panicle(P<0.05).For Ningxiangjing 9,compared with the control,ABA and MeJA treatments significantly increased the number of differentiated spikelets per panicle,spikelet survival rate per panicle,and the grain density(P<0.05),and significantly decreased the number of degenerated spikelets per panicle(P<0.05).Spraying plant growth regulators optimized the distri-bution of rice spikelets on primary and secondary branches.Compared with the control,the number of spikelets on seconda-ry branches increased by 20.42%-44.47%,and the survival rate of spikelets on secondary branches was significantly im-proved(P<0.05).Path analysis results showed that the number of differentiated spikelets per panicle had a significant di-rect positive effect on yield(P<0.05),while the number of degenerated spikelets per panicle had an extremely significant negative effect(P<0.01).It can be concluded that plant growth regulators improve the rice panicle structure through a dual pathway of promoting differentiation and inhibiting degradation.In terms of yield components,plant growth regulators signif-icantly increased yield by improving the seed setting rate and the number of grains per panicle.The results of this study can provide an important technical approach for stress-resistant and high-yield rice cultivation.关键词
水稻/高温胁迫/植物生长调节剂/颖花分化/颖花退化/产量Key words
rice/high temperature stress/plant growth regulators/spikelet differentiation/spikelet degeneration/yield分类
农业科技引用本文复制引用
车阳,杨文飞,顾大路,章安康,徐永刚,杨威,邢志鹏,蒋伟勤,李可,宋佳敏,何佳伟,李其胜,文廷刚,杜小凤..外源植物生长调节剂对高温胁迫下水稻颖花分化及退化的影响[J].江苏农业学报,2025,41(8):1475-1483,9.基金项目
淮安市科技计划项目(HAS202405) （HAS202405）
农业重大技术协同推广计划项目(2024-ZYXT-07) （2024-ZYXT-07）
淮安市农业科学研究院科研发展基金项目(HNY202114) （HNY202114）
亚夫科技服务项目[KF(24)1217] （24）
