• 作者： 吳大本
• 作者服務機構： 國立臺灣大學植物學系
• 中文摘要： Sorghum roxburghii和S. propinquum的外部形態截然不同，但二者的粗絲期核型頗相似，而且其雜種F1之粗絲期染色體配對正常，同時該雜種F1結實良好，表示二者之親緣關係密切。詳細分析粗絲期染色體發現二者唯一明顯的區別在於 S. roxburghii的核仁染色體?第一染色體，而S. propinquum之核仁染色體?第十染色體。在雜種F1的細胞核中 核仁組合體的合成能力互不相同，僅S. propinquum. 能合成正常的核仁，而S. roxburghii之核仁組合體的合成作用受到抑 制，因此在雜種F1的細胞核中不能形成其核仁，或偶爾形成其小核仁。
• 英文摘要： Although Sorghum roxburghii is quite different from S. propinquum in its morphological characters, the karyotypes of them are similar to each other. Moreover, in their F1 hybrid, pachytene pairing is normal and followed by full fertility. These results reveal that these two species are very closely related to each other. However, one striking cytological difference reveals that the nucleolus of 5. roxburghii is organized on the longest chromosome of the complement unlike in S. propinquum where the nucleolus associated with the shortest chromosome of the complement. Each of them has its distinctive nucleolus organizer. When they brought together into a single nucleus through hybridization, the organizers exhibit different synthetic abilities. In the F1 hybrid, only the normal nucleolus of S. propinquum is formed, while the nucleolus organizer of S. roxburghii becomes inactive. Inactive organizer forms no nucleolus; occasionally a vestigeal small one can be observed.
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