Varietal Improvement by Utilizing Cold Tolerance Genes of Dongxiang Wild Rice

摘要

The four chilling tolerant varieties and three male sterile lines, which can survive in winter, were selected from crossbreeding of Dongxiang wild rice (DXWR) with commercial cultivars. Chilling - tolerant varieties of SW -1, SW -2, SW - 3 and SW- 4 were derived from a DXWR x cultivars 88 - 1 cross, while the male sterile lines SWS - 1A, SWS - 2A, and SWS - 3A were derived from a DXWR x cultivars 88 - 2 cross. Three physiological indexes related to cold tolera nce were measured. The results indicated these chilling tolerant varieties have strong chilling tolerant ability.