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Study on Selecting and Mating parents of Approved Rice Varieties from 1989 to 2008 in Heilongjiang Province

LIU Hua-zhao1,DU Xin-yi2,WU Hong-yan3,ZHANG Ming-hai3,LIU Yan2(1 Rice Research Institute,Heilongjiang Academy of Land Reclamation Sciences,Jiamusi Heilongjiang 154007,China;2 Plant Protection Research Institute,Heilongjiang Academy of Land Reclamation Sciences,Jiamusi Heilongjiang 154007,China;3 Hongwei Farm,Jiamusi Heilongjiang 156322,China)  
Approved rice varieties from 1989 to 2008 in Heilongjiang Province were analyzed,the parent selecting and mating experience and new genotype developing principle were explored through tracing back to the parent characteristics,elite parents and cross type.The results showed that single cross breeding was a dominating method in japonica rice variety breeding in Heilongjiang and there was an original core gene pool at every stage of rice breeding.The core gene pool was obviously enriched from 1999 to 2008,and the original gene pool accounted for 62.65% of gene pool at the same period.As for the parent selection,the self-breeding materials were given the first place supplementing with Japanese varieties and other introduced materials.It was an effective way to breed new varieties to make cross between local varieties and introduced materials.
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