Evaluation of seed heat tolerance in different crops and genome-wide association analysis of seed heat tolerance in Brassica napus.

Global warming has adverse effects on crop growth, development and yield production. It is of great theoretical and practical significance to evaluate the seed heat tolerance of different crops and to mine the related genes for improving the tolerance of crops to high temperature stress. In order to study the differences of seed heat tolerance in different crops, the seeds of different crop varieties or parental lines were used as materials, and the germination potential and germination percentage were investigated after h, h, h, h and h of heat treatment under about 100 °C. The results showed that there were significant differences in seed heat tolerance in different crops. The general trend was that the germination potential and germination percentage decreased continuously with the extension of treatment time. The seeds of sesame and partial rapeseed varieties had the strongest heat tolerance, and the germination potential and germination percentages after hours heat treatment were still over %. The heat tolerance of wheat, rice, barley and safflower is moderate, and the heat tolerance of peanut seeds is the weakest, the germination potential and germination percentages after h treatment were less than %. In order to explore heat tolerance-related genes of rapeseed, Brassica napus lines were used as materials and treated at 100°C for 8h. And 60 K Illumina SNP array were used to conduct genome-wide association analysis of germination potential and germination percentage in two environments. As a result, 11 SNPs associated with germination potential and SNPs associated with germination percentage were detected. A total of heat tolerance-related genes were screened within the candidate interval, and some homologous genes of the genes have been reported to play an important role in heat tolerance response of other plants. [ABSTRACT FROM AUTHOR]