Survey of overwintering trait in Chinese rice cultivars (Oryza sativa L)

Overwintering rice can survive through the natural cold-winter field environment, sprout from tillering node in following spring, tiller, flower, seed, and being harvested autumn, which is a type of an extreme case cold tolerance rice. The successful utilization most economical strategy for cultivar breeding project. This work aims to identify OW future development cultivars. Altogether 1034 Chinese existing cultivars including 735 (71.08%) conventional Japonica 299 (28.92%) Indica were collected evaluated their responses low temperatures under environment. Among them, altogether 262 (25.34%) could withstand 4 °C daily minimum December 2019 throughout season distributed 13 provinces China, March 2020. Only 24 (2.32%) japonica 0 January 2021 season, also seven China. present will provide beneficial germplasm project new strategies involved elucidating molecular mechanism