Genetic mapping of EST-derived microsatellites from the diploid Gossypium arboreum in allotetraploid cotton

Molecular Genetics and Genomics : MGG
Z-G HanT-Z Zhang

Abstract

To increase the numbers of microsatellites available for use in constructing a genetic map, and facilitate the use of functional genomics to elucidate fiber development and breeding in cotton, we sampled microsatellite sequences from expressed sequence tags (ESTs) transcribed during fiber elongation in the A-genome species Gossypium arboreum to evaluate their frequency of occurrence, level of polymorphism and distribution in the At and Dt subgenomes of tetraploid cotton. From among ESTs derived from G. arboreum fibers at 7-10 days post anthesis (dpa), 931 ESTs were found to contain simple sequence repeats (SSRs); 544 (58.4%) EST-SSR primer pairs were developed, and 468 (86%) amplified PCR products from allotetraploid cotton (G. hirsutumcv. TM-1 and G. barbadense cv. Hai7124). However, only 99 (18.2%) of these were found to be polymorphic and segregating in our interspecific BC1 mapping population [(TM-1xHai7124)xTM-1]. In these amplified and informative EST-SSRs, hexa- and tri-nucleotide repeat motifs were the most frequent, representing 40.1 and 30%, respectively, of the total. A total of 111 loci detected with these 99 EST-SSRs were integrated into our backbone map including 511 SSR loci. The distribution of the EST-SSRs appe...Continue Reading

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