低温寡照自然条件对不同水稻材料苗期耐寒性的影响

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

早春低温和连续阴雨是影响水稻高产、稳产的重要限制因素之一,加快水稻耐冷性状的改良、选育耐冷品种对促进水稻高产、稳产具有重要的意义。利用早春连续阴雨的自然低温条件,对36份亲本材料及68个杂交组合的423份材料进行苗期耐冷性初步鉴定与评价。结果显示,亲本材料有10份1级强耐冷材料,其中3份是普通野生稻,4份是粳稻资源,2份是籼稻资源,1份是籼粳杂交后代。含普通野生稻血缘的杂交组合后代中,有33份1级强耐冷材料;含IRBB5组合衍生后代中,有15份1级强耐冷材料;BPHR96组合衍生后代有3份1级强耐冷材料。研究结果表明,稻种资源中具有较丰富耐冷性资源,利用强耐冷的普通野生稻资源和耐冷的籼粳稻品种杂交,是选育耐冷水稻品种的途径之一。

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 cnitivars. 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 indlca 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.