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采用60Coγ射线200Gy辐照处理晚粳稻品种“浙粳20”纯系干种子,在其后代发现2个粳稻耐旱突变体G1和G2。经(生殖生长期)海南和杭州(营养生长期)耐旱性鉴定,2个突变体耐旱性明显优于原亲本“浙粳20”,也优于巴西陆稻“IAPAR-9”。普通灌溉栽培条件下的农艺性状测试表明,2个突变体对水陆环境具有较好的双重适应性。G1综合性状优良,可直接应用于生产,G2产量偏低,可作为新的优质耐旱种质利用。
Two japonica rice drought tolerant mutants G1 and G2 were found in their offspring using 60Co γ-ray irradiation at 200 Gy for pure japonica rice “Zhejing 20”. The drought tolerance of the two mutants was significantly better than that of the original parent “Zhejing 20” and also superior to that of the Brazilian upland rice “IAPAR-9” through the (reproductive growth) of Hainan and Hangzhou (vegetative growth periods). Agronomic traits under normal irrigation conditions showed that the two mutants had good dual adaptability to the water and land environment. G1 excellent traits, can be applied directly to the production, G2 yield is low, can be used as a new high-quality drought-resistant germplasm.