Effects of Heat Stress at Vegetative and Reproductive Stages on Spikelet Fertility  

作　　者：Sulaiman CHEABU Peerapon MOUNG-NGAM Siwaret ARIKIT Apichart VANAVICHIT Chanate MALUMPONG 

机构地区：[1]Department of Agronomy, Faculty of Agriculture at Kamphaeng Saen, Kasetsart University [2]Rice Science Center & Rice Gene Discovery Unit Kamphaeng Sean Campus, Kasetsart University

出　　处：《Rice science》2018年第4期218-226,共9页水稻科学（英文版）

基　　金：supported by the Agriculture Research Development Agency of Thailand;the Office of the Higher Education Commission of Thailand for the Strategic Scholarships Fellowships Frontier Research Networks for financially supporting

摘　　要：Seed-setting rate, yield components and grain quality traits of 169 accessions from an exotic rice germplasm were tested under high temperatures from 40 oC to 45 oC for 6 h during the daytime at the vegetative and reproductive stages, respectively. The results showed that heat stress significantly decreased the seed-setting rate of all the accessions, but the heat stress effects varied among accessions. Based on the decreases in seed-setting rate at high temperatures, N22 was the most tolerant, followed by AUS17, M9962, SONALEE and AUS16. Moreover, the reductions in seed-setting rate and yield under heat stress were more serious at the vegetative stage （45 d before heading） than at the booting stage （15 d before heading）. In addition, heat stress also affected grain quality, especially by conferring chalkiness to most of the accessions, but SONALEE did not change much. The heat-tolerant accessions identified here and the phenotype protocols developed could be used in future genetic studies and breeding programmes focused on heat tolerance.Seed-setting rate, yield components and grain quality traits of 169 accessions from an exotic rice germplasm were tested under high temperatures from 40 oC to 45 oC for 6 h during the daytime at the vegetative and reproductive stages, respectively. The results showed that heat stress significantly decreased the seed-setting rate of all the accessions, but the heat stress effects varied among accessions. Based on the decreases in seed-setting rate at high temperatures, N22 was the most tolerant, followed by AUS17, M9962, SONALEE and AUS16. Moreover, the reductions in seed-setting rate and yield under heat stress were more serious at the vegetative stage （45 d before heading） than at the booting stage （15 d before heading）. In addition, heat stress also affected grain quality, especially by conferring chalkiness to most of the accessions, but SONALEE did not change much. The heat-tolerant accessions identified here and the phenotype protocols developed could be used in future genetic studies and breeding programmes focused on heat tolerance.

关 键 词：heat tolerance high temperature rice germplasm spikelet fertility seed-setting rate 

分 类 号：S511[农业科学—作物学]