2025 Volume 94 Issue 4 Pages 418-424
Sixty-three Hokkaido rice varieties, including acclimated plants were tested for chilling tolerance at the seedling stage. The results varied from over 90% to 0% from test to test. Most recently bred lines showed low survival rates after chilling acclimation. We attempted to detect quantitative trait loci (QTL) for chilling tolerance in acclimated plants using recombinant inbred lines (RILs) from the highly tolerant ‘Kitaake’ and weakly tolerant ‘Hoshinoyume’varieties. QTL with a high contribution to chromosome 9 were detected under both dark and light/dark conditions during the chilling treatment. This result indicates the possibility of using chilling tolerance in acclimated plant QTL to breed for chilling tolerance at the seedling stage.
