Development of novel chloroplast microsatellite markers for Cucumis from sequence database
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Abstract
The development of chloroplast microsatellite (cpSSR) markers in Cucumis species and analysis of their polymorphism and transferability were reported. Fifteen microsatellite markers, represented by mononucleotide repeats, were developed from the complete sequence of Cucumis sativus chloroplast genome. Intraspecific variation was successfully detected in C. sativus and C. melo and revealed mean 1.6 and 1.9 alleles per cpSSR locus, respectively. With the exception of two exon region-located cpSSR markers being monomorphic, each of the others amplified polymorphic fragments in C. sativus or C. melo. A total of 34 polymorphic loci were detected with these cpSSR markers in the two species. Transferability of the newly developed cpSSR markers was checked on an additional set of 41 Cucurbitaceae accessions (belonging to 12 different species), and except for two markers with no amplification in Cucurbita maxima, the others could be transferable to all the accessions tested. Of the 15 cpSSR markers, 14 markers generated fragments with expected band sizes and 13 markers detected interspecific polymorphism among the accessions. Intraspecific polymorphism was also observed within four Cucurbitaceae species excluding C. sativus and C. melo.
Additional key words
Cucurbitaceae monomorphism polymorphism transferabilityAbbreviations
- SSR
microsatellite or simple sequence repeat
- cpSSR
chloroplast microsatellite
- RFLP
restriction fragment length polymorphism
- CTAB
cetyltrimethylammonium bromide
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