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半个多世纪以来,对于杂种优势的研究和应用,虽然有了长足的进展,并且对世界各国的动植物育种和生产实践起了巨大的作用。然而在遗传学的理论上,迄今还没有一个十分完善的解释。Schwartz(1960)在对玉米杂交种的酯酶同工酶研究中发现了“杂种酶”现象,并首次尝试了对显性学说的分子遗传学解释。Bechman(1964)在对玉米亮氨酸氢肽酶的研究中,又发现了杂种F_1具有双亲不同酶带类型之间的互补现象。七十年代中期,Rice和Carlson等又进一步对多基因累加作用的杂种优势现象作了研究。李继耕
For more than half a century, great progress has been made in the study and application of heterosis, and it has played a huge role in the breeding and production of plants and animals all over the world. However, in the theory of genetics, so far there is no perfect explanation. Schwartz (1960) found “hybrid enzymes” in the esterase isozyme study of maize hybrids and for the first time attempted a molecular genetic explanation of the dominant theory. Bechman (1964) in the corn leucine hydrogen peptidase research, also found that the hybrid F_1 has a complementary between the parental different enzyme band types. In the mid-1970s, Rice and Carlson et al. Further studied the heterosis of multigene accumulation. Li Jiguang