Exploitation of Pepper EST-SSRs and an SSR-based Linkage Map

Overview

Journal Theor Appl Genet

Publisher Springer

Specialty Genetics

Date 2006 Oct 19

PMID 17047912

Citations 40

Authors

Gibum Yi

Je Min Lee

Sanghyeob Lee

Doil Choi

Byung-Dong Kim

Affiliations

Soon will be listed here.

Abstract

As genome and cDNA sequencing projects progress, a tremendous amount of sequence information is becoming publicly available. These sequence resources can be exploited for gene discovery and marker development. Simple sequence repeat (SSR) markers are among the most useful because of their great variability, abundance, and ease of analysis. By in silico analysis of 10,232 non-redundant expressed sequence tags (ESTs) in pepper as a source of SSR markers, 1,201 SSRs were found, corresponding to one SSR in every 3.8 kb of the ESTs. Eighteen percent of the SSR-ESTs were dinucleotide repeats, 66.0% were trinucleotide, 7.7% tetranucleotide, and 8.2% pentanucleotide; AAG (14%) and AG (12.4%) motifs were the most abundant repeat types. Based on the flanking sequences of these 1,201 SSRs, 812 primer pairs that satisfied melting temperature conditions and PCR product sizes were designed. 513 SSRs (63.1%) were successfully amplified and 150 of them (29.2%) showed polymorphism between Capsicum annuum 'TF68' and C. chinense 'Habanero'. Dinucleotide SSRs and EST-SSR markers containing AC-motifs were the most polymorphic. Polymorphism increased with repeat length and repeat number. The polymorphic EST-SSRs were mapped onto the previously generated pepper linkage map, using 107 F(2) individuals from an interspecific cross of TF68 x Habanero. One-hundred and thirtynine EST-SSRs were located on the linkage map in addition to 41 previous SSRs and 63 RFLP markers, forming 14 linkage groups (LGs) and spanning 2,201.5 cM. The EST-SSR markers were distributed over all the LGs. This SSR-based map will be useful as a reference map in Capsicum and should facilitate the use of molecular markers in pepper breeding.

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