特异株型恢复系R456配组的两个杂交组合的抗寒性

Cold Tolerance of Hybrid Rice Liangyou 456 and Shanyou 456 Combined from Restorer Line R456 of Special Plant Type

对特异株型恢复系R456配组的杂交稻两优456和汕优456两个组合在高海拔地区抽穗期的气候、结实率和产量进行了分析,初步探讨了两个组合的抗寒性和产量表现。结果表明,汕优456的平均产量达512.53kg/667m^2,平均结实率为70.07％;两优456的平均产量达490.5kg/667m^2,平均结实率为75.33％,均比对照汕优63(产量为321.2kg/667m^2,结实率为64.3％)高,在日均温低于20.0C的条件下,这两个杂交组合仍有较高的结实率。表明,用特异株型恢复系R456配组的两个杂交组合具有较强的抗寒性。

It was tested to two new hybrids rice Liangyou 456 (mated from two line system male sterile 555S and restorer R456) and Shanyou 456 (mated from three line system male sterile Zhengshan 97A and restorer 456) in the provincial hybrid rice trial at 6 different areas of Guizhou. The autumn cold weather always occurred at the rice heading period in 3 high altitude sites especially at Guiyang site and it affect the seed setting rate and yield of some rice varieties. However, the seed setting rate and yield of Shanyou 456 (with seed setting rate 70. 07% and yield 7687. 95kg/ha) and Liang you 456 (with seed setting rate 75. 3% and yield 7357kg/ha) were higher than CK Shanyou 63 (with seed setting rate 64.3% and yield 4818kg/ha). It indicated that these two new hybrids were cold tolerant certainly.