文献类型: 外文期刊
第一作者: Qiong Wu
作者: Qiong Wu;Fang Liu;Shaohui Li;Guoli Song;Chunying Wang;Xiangdi Zhang;Yuhong Wang;David Stelly;Kunbo Wang
作者机构:
关键词: Chromosomes;cotton;Gossypium mustelinum;in situ hybridization;nucleolar organizer region;genome
期刊名称:Journal of Integrative Plant Biology ( 影响因子:7.061; 五年影响因子:6.002 )
ISSN: 1672-9072
年卷期: 2013 年 55 卷 7 期
页码:
收录情况: CSCD
摘要: Gossypium mustelinum ((AD)_4) is one of five disomic species in Gossypium. Three 45S ribosomal DNA (rDNA) loci were detected in (AD)_4 with 45S rDNA as probe, and three pairs of brighter signals were detected with genomic DNA (gDNA) of Gossypium D genome species as probes. The size and the location of these brighter signals were the same as those detected with 45S rDNA as probe, and were named GISH-NOR. One of them was super-major, which accounted for the fact that about one-half of its chromosome at metaphase was located at chromosome 3, and other two were minor and located at chromosomes 5 and 9, respectively. All GISH-NORs were located in A sub-genome chromosomes, separate from the other four allopolyploid cotton species. GISH-NOR were detected with D genome species as probe, but not A. The greatly abnormal sizes and sites of (AD)_4 NORs or GISH-NORs indicate a possible mechanism for 45S rDNA diversification following (AD)_4 speciation. Comparisons of GISH intensities and GISH-NOR production with gDNA probes between A and D genomes show that the better relationship of (AD)_4 is with A genome. The shortest two chromosomes of A sub-genome of G. mustelinum were shorter than the longest chromosome of D sub-genome chromosomes. Therefore, the longest 13 chromosomes of tetraploid cotton being classified as A sub-genome, while the shorter 13 chromosomes being classified as D sub-genome in traditional cytogenetic and karyotype analyses may not be entirely correct.
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