Abstract
Expressed sequence tag (EST)-derived simple sequence repeat (eSSR) markers are important resources for gene discovery and comparative mapping aimed at crop improvement. In this study, we developed eSSR markers for Medicago truncatula and assessed their cross-species transferability. We detected 36,847 non-redundant sequences ("unigenes") from 198,642 M. truncatula EST sequences. Mining of microsatellites from the 36,847 unigene sequences (representing approximately 25.8 Mb) revealed 14,637 eSSRs in 11,750 SSR-containing ESTs, and primer pairs were successfully designed for 4,636 (39.5%). Of the 14 637 eSSRs, 82.6% were mononucleotide repeats and the rest (in descending order of abundance) were tri-, di-, penta-, and tetranucleotide repeats. When less stringent SSR detection criteria were used, the frequency of dinucleotide repeat motifs increased more than twofold, and the frequencies of di- (11%) and trinucleotide motifs (10.6%) were almost equal. This demonstrates that the eSSR frequency and distribution were related to the choice of search criteria. Forty-one randomly selected primer pairs were validated, and their transferability in three leguminous and three non-leguminous species was assessed. The markers showed a high le...Continue Reading
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