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在自花授粉的作物中,育成生产上用的杂种有一些固定存在的困难。细胞质雄性不育性以及育性恢复基因在水稻中是存在的,但是在异交中雄性不育株不能产生令人满意的结实。小穗不育性受环境影响很大,但有些不育系比其他一些较稳定。已经发现半矮水稻品种,台中本地一号是不育细胞质和育性恢复基因的一个来源。另一品种,Pankhari 203可起保持系的作用。由Pankhari×台中本地一号组合和两次回交Pankhari获得了完全的雄性不育后代,提供了有关杂种优势的研究的文献。在稻属中,发现了花的形态的一些变异的跡象和异交可能性。
In self-pollinating crops, there are some fixed difficulties with breeding hybrids for production. Cytoplasmic male sterility and fertility restorer genes are present in rice, but male sterile lines do not produce satisfactory grain quality during outcrossing. Spikelet sterility is greatly affected by the environment, but some CMS lines are more stable than others. It has been found that a semi-short rice variety, Taichung Local One, is a source of sterile cytoplasm and fertility restorer genes. Another species, Pankhari 203, can function as a maintainer. Complete male sterile offspring were obtained from the Pankhari × Taichung native-one combination and two backcrossing Pankhari, providing a literature on the study of heterosis. In the genus Oryza, some signs of variation and the possibility of outcrossing were found in flower morphology.