Effect of Low Temperature and Sparse Light Conditions on Cold Tolerance of Different Rice Lines at Seedling Stage

Low temperature and sparse light conditions in early spring is one of the factor caused lost for rice production. So it is important to develop cold tolerance cultivars. In the present study,cold tolerance characters of 36 parents and 423 rice lines from 68 hybrid groups their filial were investigated at seedling stage under low temperature and sparse light conditions in field. There were 10 parent accessions with strong cold tolerance of scale 1. Among them,3 were common wild rice accessions; 4 were japonica rice cultivars; 2 were indica rice; 1 was offspring from hybrid between indica and japonica. There were 33 lines of strong cold tolerance with index of 1 from the hybrid group of common wild rice,and 15 from the hybrid groups of IRBB5,and only 3 from the groups of BPHR96. There were abundant cold tolerance resources in rice germplasm. It was feasible to develop cold tolerance cultivars from the hybrids among common wild rice,Japonica cultivars and indica cultivars.