Identification of cold tolerance of rice germplasm resource at germinating stage in cold region.

摘要

Seventy-five rice varieties (lines) in Heilongjiang Province (or cold region) in China, used as germplasm resources, were identified for cold tolerance at the germinating stage by controlling temperature in an artificial incubator. The results showed that the shooting seed rate at the germinating stage could be used as the evaluation index of cold tolerance. The cold tolerance was recorded on a 1-9 scale and could be identified by the criteria of five indexes, i.e. highly tolerant (HT), tolerant (T), moderately tolerant (MT), susceptible (S) and highly susceptible (HS).