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Uniqueness of the Gossypium mustelinum Genome Revealed by GISH and 45S rDNA FISH

文献类型： 外文期刊

作者： Wu, Qiong 1 ; Liu, Fang 1 ; Li, Shaohui 1 ; Song, Guoli 1 ; Wang, Chunying 1 ; Zhang, Xiangdi 1 ; Wang, Yuhong 1 ; Stelly 1 ;

作者机构： 1.Chinese Acad Agr Sci, Natl Key Lab Cotton Biol, Cotton Res Inst, Anyang 455000, Peoples R China

2.Chinese Acad Trop Agr Sci, Haikou Expt Stn, Haikou 570102, Peoples R China

3.Texas A&M Univ, Dept Soil & Crop Sci, College Stn, TX 77843 USA

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： SCI

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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