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近来,在水稻育种的学术问题上,提出了一种采用籼粳杂交,选育矮秆大穗、根系发达、繁茂性好、叶片直立、产量高的籼粳型新品种,这种品种既具有杂交水稻的优势,又可省去年年制种的麻烦,暂称为“非杂种优势”的理论。关于“非杂种优势”的提法,我们认为是值得商榷的。杂种优势是指两种不同遗传基础的纯合体亲本杂交所产生的第一代超亲的现象。由于杂种一代每个个体的杂合遗传物质相同,个体之间的表现一致,因此杂交种可作为品种在生产上应用,但由于杂交种的遗传基础是杂合的,自交繁殖的后代发生分离,所以
Recently, on the academic issue of rice breeding, a new indica and japonica variety with indica-japonica cross breeding, dwarf big spike, well-developed root system, good lushness, upright leaves and high yield was proposed. This variety has both The advantages of hybrid rice, but also save the trouble of annual seed production, tentatively called “non-heterosis” theory. As for the reference to “non-heterosis,” we think it is debatable. Heterosis refers to the phenomenon of first-generation hyper-progeny produced by the homozygous parental crosses of two different genetic bases. Since hybrids have the same heterozygous genetic material among individuals and the same performance among individuals, the hybrids can be used as varieties in production. However, since the genetic basis of hybrids is heterozygous, offspring of offspring are segregated ,and so