Comprehensive evaluation of 126 rice germplasm resources under natural high temperature conditions

doi:10.14088/j.cnki.issn0439-8114.2025.10.001

Abstract

Abstract: The heat tolerance evaluation and phenotypic traits analysis of 126 rice (Oryza sativa L.) germplasm resources were carried out by using the natural high-temperature conditions in Jingzhou City, Hubei Province and Sanming City, Fujian Province in 2022. The results demonstrated that grain width exhibited a highly significant positive correlation with seed-setting rate and 1 000-grain weight under natural high-temperature, indicating that grain width mgiht play an important role in heat tolerance. The coefficients of variation of spike number, grain number per spike, length-width ratio and seed setting rate were large, and the genetic diversity was rich, which had great potential for utilization. A total of 40 heat-resistant germplasms, 44 suspected susceptible germplasms and 42 heat-sensitive germplasms were identified by heat resistance evaluation. Cluster analysis further divided the materials into four groups, and the third group was outstanding in grain width, seed setting rate and 1 000-grain weight. The selected heat-resistant germplasm resources could be used to improve existing varieties or as donor materials for mining new heat-resistant genes, which provided an important material basis and theoretical basis for rice heat-resistant breeding.

Key words: rice (Oryza sativa L.), heat tolerance, germplasm resources, natural high temperature, comprehensive evaluation

CLC Number:

S511

WANG Ting-bao, LIU Gang, QIU Dong-feng, ZHU Ye-bao, ZHANG Zai-jun, HE Yong, LIU Zhi-en, ZHANG Shi-qian, LIU Yao-wei, TIAN Zhi-hong. Comprehensive evaluation of 126 rice germplasm resources under natural high temperature conditions[J]. HUBEI AGRICULTURAL SCIENCES, 2025, 64(10): 1-9.

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