水稻籼粳交F_1、F_2代及杂交育成品种分类的研究

利用程氏形态指数分类法对水稻籼粳交F1、F2 代及籼粳杂交育成品种进行分类。研究结果表明 :程氏形态指数分类法能较好地对籼粳亚种及其杂交后代进行分类 :籼粳交F1代大多数分类性状均偏向于籼稻特性 ,类型上划分为偏籼型 ;F2 代呈正态分布 ,4种类型均有 ,以中间类型为最多 ,F2 代类型丰富 ;在参试杂交育成品种中 ,尽管各个品种 (系 )都或多或少地带有籼稻和粳稻的血缘 ,但就程氏指数 6个亚种特性而言 ,除穗节长外 ,其它 5个性状仍然基本保持典型粳稻特性 ,在分类地位上仍然属于粳稻

Studies on classification of F1

In this study,the F 1?F 2 and their parents of crossing combination between different type rice varieties and varieties breed through hybridization between indica and japonica were classified using Cheng's morphology index method,the results were: Indica,japonica,intermediate rice and varieties breed through hybridization between indica and japonica could be well classified by Cheng's morphology index method;The classific research to F 1 of crossing combinations between different types indicated that F 1 from indica_japonica reciprocal cross combinations were indicaclinous;The classific research to the segregation generation-F 2 of different cross combination indicated that Cheng's index distrbution in F 2 of different hybrid combination showed a consistent variation.The segregation of Indica_japonica combinations were normal distributions,with most of the hybrids were intermediate types;The classific results of varieties breed through hybridization between indica and japonica indicated that these varieties were still japonica with a few japonicaclinous from view of classific position.For these six characters,GC?LP?GP?L/W PhR of these varieties were still japonica characters,except that LOR was normal distribued and well recombined with two parents characters.heading time (GC),glume pubescence(GP),leaf pubescence(LP),length of the lst & the 2nd rachis(LOR),length/width ratio of spikelets (L/W),phenol reaction(PhR)],the varieties breed belonged to japonica.