Extraordinarily conserved chromosomal synteny ofCitrusspecies revealed by chromosome-specific painting
文献类型： 外文期刊
作者： He, Li 1 ; Zhao, Hainan 2 ; He, Jian 1 ; Yang, Zujun 3 ; Guan, Bin 1 ; Chen, Keling 1 ; Hong, Qibin 4 ; Wang, Jianhui 1 ; Li 1 ;
作者机构： 1.Sichuan Acad Agr Sci, Cultivat Hort Inst, Natl Local Joint Engn Lab Citrus Breeding, Chengdu 610066, Peoples R China
2.Michigan State Univ, Dept Plant Biol, E Lansing, MI 48824 USA
3.Univ Elect Sci & Technol China, Ctr Informat Biol, Sch Life Sci & Technol, Chengdu 611731, Peoples R China
4.Southwest Univ, Natl Citrus Engn Res Ctr, Citrus Res Inst, Chinese Acad Agr Sci, Chongqing 400712, Peoples R China
5.Michigan State Univ, Dept Hort, E Lansing, MI 48824 USA
6.Michigan State Univ AgBioRes, E Lansing, MI 48824 USA
关键词： chromosome synteny; oligo-FISH; karyotype; Citrusspecies
期刊名称：PLANT JOURNAL （ 影响因子：6.417； 五年影响因子：7.627 ）
ISSN： 0960-7412
年卷期：
页码：
收录情况： SCI
摘要： Reliable identification of individual chromosomes in eukaryotic species is the foundation for comparative chromosome synteny and evolutionary studies. Unfortunately, chromosome identification has been a major challenge for plants with small chromosomes, such as theCitrusspecies. We developed oligonucleotide-based chromosome painting probes for all nine chromosomes inCitrus maxima(Pummelo). We were able to identify allC. maximachromosomes in the same metaphase cells using multiple rounds of sequential fluorescencein situhybridization with the painting probes. We conducted comparative chromosome painting analysis in six differentCitrusand related species. We found that each painting probe hybridized to only a single chromosome in all other five species, suggesting that the six species have maintained a complete chromosomal synteny after more than 9 million years of divergence. No interchromosomal rearrangement was identified in any species. These results support the hypothesis that karyotypes of woody species are more stable than herbaceous plants because woody plants need a longer period to fix chromosome structural variants in natural populations.
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