植物遗传资源学报2026，Vol.27Issue(4)：722-733,12.DOI:10.13430/j.cnki.jpgr.20251217002
不同年代籼稻品种生育早期耐冷性差异
Differences of Cold Tolerance at Early Growth Stages for Indica Rice Varieties Developed in Different Years
摘要
Abstract
Frequent low-temperature stress in early spring occurs in the rice-growing regions of southern China,seriously restricting the stable production of indica rice.Systematically exploring and utilizing elite cold-tolerant germplasm resources is therefore an urgent need for cold-tolerance breeding in indica rice.In this study,298 representative conventional indica cultivars developed across different breeding eras in China were used to systematically evaluate 16 key cold-tolerance traits at the germination,bud,and seedling stages in an artificial climate incubator.Comparative and cluster analyses of cold-tolerance traits across eras were conducted to elucidate the evolutionary pattern of cold tolerance in indica rice.The results showed that:Cold tolerance exhibited significant stage specificity,with weak correlations among the germination,bud,and seedling stages,indicating largely independent genetic bases;Cold tolerance has been progressively improved over breeding eras,and modern cultivars(A2000s)performed significantly better than early cultivars at all stages,with seedling survival rate increasing from 37.49％-43.27％in early cultivars to 56.39％;Phenotypic clustering classified the cultivars into three groups and revealed a clear enrichment trend from Group Ⅲ(intermediate type)and Group Ⅱ(sensitive type)toward Group Ⅰ(strong cold-tolerant type),within which modern cultivars accounted for 56.19％;Eighteen elite germplasm lines with strong cold tolerance at the germination,bud,and seedling stages,such as Huangyuesimiao and Nantezhan,were identified from Group Ⅰ and showed consistently superior performance across all stages.This study clarifies the stage specificity and breeding-era evolution of early cold tolerance in indica rice,and provides elite germplasm resources valuable for breeding practice,offering both theoretical support and material foundations for the genetic improvement of cold tolerance and the development of new cold-tolerant indica cultivars.关键词
籼稻/种质资源/生育早期/耐冷性/聚类分析Key words
indica rice/germplasm resources/early growth stages/cold tolerance/cluster analysis引用本文复制引用
梁慧苑,马小定,韩冰,赵正武,韩龙植,崔迪..不同年代籼稻品种生育早期耐冷性差异[J].植物遗传资源学报,2026,27(4):722-733,12.基金项目
国家重点研发计划(2021YFD1200500) （2021YFD1200500）
中国农业科学院科技创新工程National Key Research and Development Program of China(2021YFD1200500) （2021YFD1200500）
Agricultural Science and Technology Innovation Program of Chinese Academy of Agricultural Sciences （）
