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火柴头染色体核型及核糖体基因原位杂交研究 被引量:6

Studies on chromosomal karyotype and ribosome genes in Bengal dayflower ( commelina bengalensis L.) by fluo-rescent in situ hybridization
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摘要 火柴头是一年生单子叶恶性杂草 ,具有地上和地下茎同时开花结实的特殊习性。研究表明 ,地上和地下部分种子产生的植株体细胞染色体核型相同 ,中期染色体平均长 10 μ ,体细胞染色体核型由两对随体染色体(染色体 5和 9)、4对中部着丝点 (染色体 1,3,8,11)和 5对亚中部着丝点染色体组成 (染色体 2 ,4 ,6 ,7,10 ) ,属对称型。核型公式为 2n =2 2 =4m +5sm +2st。核糖体基因 (4 5S)位于两对随体染色体的核仁组织区 ,杂交信号在两对染色体上的程度不同 ,表明了该基因的拷贝数在位点间有差别 ,并明确证实地下种子是正常自花受精的结果。本文对利用核糖体基因作为分子标记 ,通过原位杂交进行植物染色体的识别和染色体的进化进行了讨论。
出处 《杂草科学》 2004年第1期1-4,共4页 Weed Science
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