水稻不同类型杂种F_2产量性状变异及籼粳分类研究

比较了盐粳68/密阳50、盐粳68/盐粳34和盐粳68/一目惚3个不同类型组合F2产量性状变异及盐粳68/密阳50植株的F2程氏指数分布、不同类型产量性状的变化。结果表明,不同类型水稻杂种F2产量性状的变异幅度存在着粳/籼>粳/中间型>粳/粳的趋势,但粳/籼出现优良单株的频率低于粳/中间型。粳/籼后代程氏指数表现出正态分布,即偏籼、偏粳的中间型占绝大多数。籼型、粳型后代的程氏指数性状表现典型特征,偏籼、偏粳型后代的程氏指数性状表现中间类型。籼型、偏籼型、偏粳型、粳型后代产量性状上存在着明显区别。

Study on Yield Characteristics Variation of F2 in Different Types in Rice and Classification of indica- japonica

Comparison of yields characteristics variation among the F2 progeny of different types of crosses,Yanjing68/Milyang50,Yanjing68/Yanjing34,and Yanjing68/Hitomebore and Cheng's indexes distribution of F2 progeny of Yanjing68/Milyang50.Results showed that the yield characteristics variation of F2 progeny was that japonica/indica>japonica/intermediate> japonica/japonica,but the F2 progeny of japonica/indica has less good individual-plant frequency than japonica/intermediate.Cheng's index was normal distribution,indicating that indica-clinous and japonica-clinous intermediate types constitute the majority.The Cheng's index traits in F2 progeny of indica type and japonica type performed typically,while Cheng's index traits of indica-clinous and japonica-clinous progeny showed intermediate type.The yield characteristics have definite difference among F2 progeny of indica,indica-clinous,japonica-clinous and japonica types.