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1水稻亚种间杂种及亚种间杂种的标准人们认识的水稻亚种间的超强杂种优势来自籼粳稻直接杂交产生的大青棵(或称冬不老)。大青棵巨大的“源”、“库”优势,吸引了国内外众多水稻育种家们的强烈关注和悉心研究。大青棵的低育或不育、超高和延迟抽穗,这些只是表现型特征,而与其对应的是大青棵的细胞核为籼粳各半,即为籼粳两大基因组等量集合的基因型(简称“基因组基因型”),这个基因型特征在籼粳亚种间杂种优势利用的研究中鲜见有人从此角度来思考,特别是将其表现型特征
1 Rice Subspecies Interspecific Hybrids and Interspecies Hybrids The super hybrid heterosis among rice subspecies recognized by the direct hybridization of indica and japonica Daqing (or Asparagus). Daqing tree huge “source ”, “library ” advantage, attracted many domestic and foreign rice breeders strong concern and careful study. Daqingcong’s low fertility or sterility, high and delayed heading are only phenotypic characteristics, but their corresponding nuclei of Daqingcong are half of indica and japonica, which is the same set of genes of two major genomes of indica and japonica (“Genomic genotype” for short), it is seldom seen in this study on the heterosis utilization between indica and japonica subspecies of genotypes from this point of view. In particular, the phenotypic characteristics