Comparison of the distribution of the repetitive DNA sequences in three variants of Cucumis sativus reveals their phylogenetic relationships

Xin Zhao; Jingyuan Lu; Zhonghua Zhang; Jiajin Hu; Sanwen Huang; Weiwei Jin

doi:10.1016/j.jcg.2010.12.005

Volume 38 Issue 1

Jan. 2011

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Article Navigation > Journal of Genetics and Genomics > 2011 > 38(1): 39-45

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Comparison of the distribution of the repetitive DNA sequences in three variants of Cucumis sativus reveals their phylogenetic relationships

doi: 10.1016/j.jcg.2010.12.005

a
National Maize Improvement Center of China, Key Laboratory of Crop Genetic Improvement and Genome of Ministry of Agriculture, Beijing Key Laboratory of Crop Genetic Improvement, China Agricultural University, Beijing 100193, China
b
College of Bioscience and Biotechnology, Hunan Agricultural University, Changsha 410128, China
c
Opening Lab of Genetic Improvement of Agricultural Crops of Ministry of Agriculture, Sino-Dutch Joint Lab of Horticultural Genomics, Institute of Vegetables and Flowers, Chinese Academy of Agricultural Sciences, Beijing 100081, China

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Corresponding author: E-mail address: huangsanwen@caas.net.cn (Sanwen Huang); E-mail address: weiweijin@cau.edu.cn (Weiwei Jin)
Received Date: 2010-12-01
Accepted Date: 2010-12-24
Rev Recd Date: 2010-12-20

Available Online: 2011-02-19

Publish Date: 2011-01-20

Abstract

Abstract

Repetitive DNA sequences with variability in copy number or/and sequence polymorphism can be employed as useful molecular markers to study phylogenetics and identify species/chromosomes when combined with fluorescence in situ hybridization (FISH). Cucumis sativus has three variants, Cucumis sativus L. var. sativus, Cucumis sativus L. var. hardwickii and Cucumis sativus L. var. xishuangbannesis. The phylogenetics among these three variants has not been well explored using cytological landmarks. Here, we concentrate on the organization and distribution of highly repetitive DNA sequences in cucumbers, with emphasis on the differences between cultivar and wild cucumber. The diversity of chromosomal karyotypes in cucumber and its relatives was detected in our study. Thereby, sequential FISH with three sets of multi-probe cocktails (combined repetitive DNA with chromosome-specific fosmid clones as probes) were conducted on the same metaphase cell, which helped us to simultaneously identify each of the 7 metaphase chromosomes of wild cucumber C. sativus var. hardwickii. A standardized karyotype of somatic metaphase chromosomes was constructed. Our data also indicated that the relationship between cultivar cucumber and C. s. var. xishuangbannesis was closer than that of C. s. var. xishuangbannesis and C. s. var. hardwickii.
- Cucumber,
- Wild cucumber,
- Satellite repeats

These authors contributed equally to this paper.

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References(32)

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