关键词: 青枯雷尔氏菌, 青枯雷尔氏菌, 生理小种, 生化型, 福州

Abstract: Hejiang No.19 is a superexcellence rice variety with early maturity, good quality, high yield, high blast resistance and wide adaptability together. It has been planted for 30 years. It has become the first rice variety in cold regions for its area spreaded, long planted and notable social economic benefits. Pedigree of Hejiang No.19 was analyzed in this paper. Its relative relation and basis of descendiblity were understood. The reasons and the suggestions were discussed at the same time. Indicated that the difficulty of rice breeding in cold regions should be recognized, improved the main varieties through making use of the main varieties as core germplasm and appending the new germplasm. Descendants should be selected on cold tolerance, blast resistance, high yield and wide adaptability in different years and diverse sections. Combine good varieties with compatible planting means, in order to the varieties raised have wider adaptability.