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Cytogenetic relationships among Citrullus species in comparison with some genera of the tribe Benincaseae (Cucurbitaceae) as inferred from rDNA distribution patterns

文献类型： 外文期刊

作者： Li, Kun-Peng 1 ; Wu, Yun-Xiang 1 ; Zhao, Hong 2 ; Wang, Yan 1 ; Lu, Xing-Ming 1 ; Wang, Ji-Ming 3 ; Xu, Yong 2 ; Li, Zong 1 ;

作者机构： 1.Jiangsu Normal Univ, Sch Life Sci, Inst Integrat Plant Biol, Xuzhou 221116, Peoples R China

2.Beijing Acad Agr & Forestry Sci, Natl Engn Res Ctr Vegetables, Key Lab Biol & Genet Improvement Hort Crops North, Beijing 100097, Peoples R China

3.Chinese Acad Agr Sci, Zhengzhou Fruit Res Inst, Zhengzhou 450009, Peoples R China

关键词： rDNA;Oligonucleotides probes;Citrullus species;Cytogenetic relationship;Fluorescence in situ hybridization

期刊名称：BMC EVOLUTIONARY BIOLOGY （ 影响因子：3.26； 五年影响因子：3.732 ）

ISSN： 1471-2148

年卷期： 2016 年 16 卷

页码：

收录情况： SCI

摘要： Background: Comparative mapping of 5S and 45S rDNA by fluorescent in situ hybridization (FISH) technique is an excellent tool to determine cytogenetic relationships among closely related species. Results: In this study, the number and position of 5S and 45S rDNA loci in all Citrullus species and subspecies were determined. The cultivated watermelon (C. lanatus subsp. vulgaris), C. lanatus subsp. mucosospermus, C. colocynthis and C. naudinianus (or Acanthosicyos naudinianus) had two 45S rDNA loci and one 5S rDNA locus which was located syntenic to one of the 45S rDNA loci. C. ecirrhosus and C. lanatus subsp. lanatus had one 45S rDNA locus and two 5S rDNA loci, each located on a different chromosome. C. rehmii had one 5S and one 45S rDNA locus positioned on different chromosomes. The distribution of 5S and 45S rDNA in several species belonging to other genera in Benincaseae tribe was also investigated. The distribution pattern of rDNAs showed a great difference among these species. Conclusions: The present study confirmed evolutionary closeness among cultivated watermelon (C. lanatus subsp. vulgaris), C. lanatus subsp. mucosospermus and C. colocynthis. Our result also supported that C. lanatus subsp. lanatus was not a wild form of the cultivated watermelon instead was a separate crop species. In addition, present cytogenetic analysis suggested that A. naudinianus was more closely related to Cucumis than to Citrullus or Acanthosicyos, but with a unique position and may be a link bridge between the Citrullus and the Cucumis.

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