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玉米、二倍体多年生类玉米及其杂交后代异染色质纽重复序列在染色体上的分布 被引量:3

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摘要 利用组成玉米异染色质纽的180-bp重复序列和TR-1元件以及45SrDNA对二倍体多年生类玉米(ZeadiploperennisIltisDoebtey,DP)、玉米自交系F102及其远缘杂交后代的有丝分裂中期染色体进行了定位.在DP中,第1和4染色体的短臂以及第4和5染色体的长臂上的异染色质纽只有180-bp重复序列信号,此外,在第2和5染色体的短臂以及第2,6,7,8和9染色体的长臂同时检测到180-bp重复序列和TR-1的信号.在玉米自交系F102中,180-bp重复序列信号出现在第7染色体短臂和第8染色体一个成员的长臂,TR-1信号是在第6染色体的随体上,该玉米自交系中没有观察到双重复序列同时出现的现象.两物种间,180-bp重复序列和TR-1元件信号大小、数目和染色体分布存在多态性,同一种内部分同源染色体之间具有异态性.以这些细胞学标记为探针,玉米和DP种间杂交后代得以鉴定.180-bp重复序列和TR-1元件比较定位分析有助于了解玉米属基因组间的结构和进化关系.
出处 《科学通报》 EI CAS CSCD 北大核心 2004年第12期1162-1165,共4页 Chinese Science Bulletin
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共引文献28

同被引文献31

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