文献类型: 外文期刊
第一作者: Xinglei Cui
作者: Xinglei Cui;Fang Liu;Yuling Liu;Zhongli Zhou;Chunying Wang;Yanyan Zhao;Fei Meng;Xingxing Wang;Xiaoyan Cai;Yuhong Wang;Renhai Peng;Kunbo Wang
作者机构:
关键词: Cotton;BAC;FISH;cytological marker;microcolinearity
期刊名称:COMPARATIVE CYTOGENETICS ( 影响因子:1.8; 五年影响因子:1.438 )
ISSN: 1993-0771
年卷期: 2016 年 10 卷 1 期
页码:
收录情况: SCI
摘要: Two bacterial artificial chromosome (BAC) clones (350B21 and 299N22) of Pima 90-53 cotton [Gossypium barbadense Linnaeus, 1753 (2n=4x=52)] were screened from a BAC library using SSR markers. Strong hybridization signals were detected at terminal regions of all A genome (sub-genome) chromosomes, but were almost absent in D genome (sub-genome) chromosomes with BAC clone 350B21 as the probe. The results indicate that specific sequences, which only exist at the terminal parts of A genome (sub-genome) chromosomes with a huge repeat number, may be contained in BAC clone 350B21. When utilizing FISH with the BAC clone 299N22 as probe, a pair of obvious signals was detected on chromosome 13 of D genome (sub-genome), while strong dispersed signals were detected on all A genome (sub-genome) chromosomes. The results showed that peculiar repetitive sequence, which was distributed throughout all A genome (sub-genome) chromosomes, may exist in BAC clone 299N22. The absence of the repetitive sequences, which exist in the two BAC clones, in D genome may account for the genome-size variation between A and D genomes. In addition, the microcolinearity analysis of the clone 299N22 and its homologous region on G. raimondii Ulbrich, 1932 chromosome 13 (D(5)13) indicated that the clone 299N22 might come from A sub-genome of sea island cotton (G. barbadense), and a huge number of small deletions, illegitimate recombination, translocation and rearrangements may have occurred during the genus evolution. The two BAC clones studied here can be used as cytological markers but will be also be helpful to research in cotton genome evolution and comparative genomics.
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