Studies on the Breeding of Oil Rape (Brassica napus var. oleifera) by Means of Interspecific Crosses between B. campestris ssp. oleifera and B. oleracea : I. Interspecific Crosses with the Application of Grafting Method or the Treatment of Sugar Solution

Abstract

It is extremely difficult to obtain the hybrid seeds between the 10- and the 9-chromosome species in the genus Brassica by ordinary methods of crossing. However, the author succeeded in the hybridization with fairly high cross fertility through the application of grafting method, yielding three types of hybrid plants whose diploid number of chromosomes was 19, 28 38, respetively.