华中农业大学学报2025，Vol.44Issue(5)：25-35,11.DOI:10.13300/j.cnki.hnlkxb.2025.05.003
长江中下游主栽水稻钾高效品种筛选及其生理生化特征
Screening potassium efficient rice varieties mainly planted in middle and lower reaches of Yangtze River and its physiological and biochemical characteristics
摘要
Abstract
57 rice varieties mainly planted in the middle and lower reaches of Yangtze River were used to study the physiological and biochemical characteristics of potassium efficient rice varieties planted in this region.Hydroponic culture was conducted to screen potassium utilization efficiency.The potassium effi-cient and potassium inefficient rice varieties were used to analyze the differences in growth,yield formation,absorption and translocation of potassium,the expression level of related genes with hydroponic culture,soil pot experiment,and field assay.The results showed that the potassium efficient and potassium inefficient rice variety was determined to be Xiangliangyou No.16(23#)and Xinganxiangzhan(14#).The potassium efficient rice variety had better root architecture and biomass under both+K and-K treatments,with sig-nificantly higher plant height,root length,number of root tips,total surface area and volume of roots,and dry weight of roots and shoots compared to that of potassium inefficient rice variety.The effective number of spikes,spike length,thousand-grain weight,and grain yield of the potassium efficient rice variety was high-er than that of the potassium inefficient rice variety.The absorption,translocation and utilization of potassi-um in potassium efficient rice variety was significantly higher than that in the potassium inefficient rice vari-ety.The accumulation of potassium in roots and shoots,the absorption of potassium in plant,potassium utili-zation index,and distribution ratio in grains of potassium efficient rice variety were all significantly higher than that of the potassium inefficient variety.The expression level of OsAKT1,OsHAK1,OsHAK4,OsH-KT2;1,OsKAT2,and OsKAT3 gene in the potassium efficient rice variety was significantly higher than that in the potassium inefficient rice variety.It is indicated that excellent root architecture,stronger absorp-tion capacity of potassium,efficiently transporting potassium to shoot,and distributing more potassium to grains are important characteristics of the potassium efficient rice variety.关键词
水稻/钾利用效率/根系构型/钾吸收转运/基因表达/产量Key words
rice/potassium utilization efficiency/architecture of root system/absorption and translo-cation of potassium/gene express/yield分类
农业科技引用本文复制引用
马晓诺,侯星宇,蔡红梅..长江中下游主栽水稻钾高效品种筛选及其生理生化特征[J].华中农业大学学报,2025,44(5):25-35,11.基金项目
国家重点研发计划项目(2021YFD1901203) （2021YFD1901203）
