Studies on Classification of F_1、F_2 and Varieties Breed Through Hybridization between Indica and Japonica Rice

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.