摘要
对诸葛菜减数分裂的研究表明，染色体在终变期表现出30多种配对构型。其中主要的9种为：12Ⅱ，10Ⅱ＋1Ⅳ，8Ⅱ＋2Ⅳ，9Ⅱ＋1Ⅳ，6Ⅱ＋2Ⅵ，8Ⅱ＋1Ⅶ，6Ⅱ＋1Ⅵ＋1Ⅶ，7Ⅱ＋1Ⅹ，5Ⅱ＋1Ⅳ＋1Ⅹ。121Ⅱ的构型与其它构型各约1／2。四、六、八、十等多价体为环状或链状。在中期Ⅰ时观察到高频率的次级联会。以上结果表明诸葛菜的染色体间存在高度同源性，故其可能为一自然多倍体种。另外，诸葛菜的10条染色体形成一个完整的染色体环，这表明其12对染色体中有5条非同源染色体发生了相互易位。文中还对诸葛菜染色体组所具有的特殊结构的意义等进行了讨论。
More than thirty chromosome pairing configurations were observed in the pollen mother cells of O' violaceus, mainly being 12Ⅱ,10Ⅱ＋1Ⅳ,8Ⅱ＋2Ⅳ,9Ⅱ＋1Ⅳ,6Ⅱ＋2Ⅵ,8Ⅱ＋1Ⅶ,6Ⅱ＋1Ⅵ＋1Ⅶ，7Ⅱ＋1Ⅹ,5Ⅱ ＋1Ⅳ＋1Ⅹ X and 5 Ⅱ+1Ⅳ+1Ⅹ. The multivalents with 4, 6, 8 and 10 chromosomes appeared The percentage of PMCs with 12 Ⅱ was 50. 6 %' The secondary association of chromosomes with a high frequency at metaphase I and the chro-mosome pairing above suggested that O. violaceus be a natural polyploidy species. The for mation of the crossed ring shape tenvalents showed that the translocations occurred among 5 nonhomologous chromosome pairs of O' violaceus' The implications of , the polyploidy nature of the species lor chromosome engineering were discussed.
出处
《华中农业大学学报》
CAS
CSCD
北大核心
1995年第5期435-439,T002,共6页
Journal of Huazhong Agricultural University
基金
国家自然科学基金
关键词
诸葛菜
染色体配对
减数分裂
Orychophragmus violaceus
chromosome pairing
meiosis
