alexa A COSII genetic map of the pepper genome provides a detailed picture of synteny with tomato and new insights into recent chromosome evolution in the genus Capsicum.
Biochemistry

Biochemistry

Journal of Plant Biochemistry & Physiology

Author(s): Wu F, Eannetta NT, Xu Y, Durrett R, Mazourek M,

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Abstract We report herein the development of a pepper genetic linkage map which comprises 299 orthologous markers between the pepper and tomato genomes (including 263 conserved ortholog set II or COSII markers). The expected position of additional 288 COSII markers was inferred in the pepper map via pepper-tomato synteny, bringing the total orthologous markers in the pepper genome to 587. While pepper maps have been previously reported, this is the first complete map in the sense that all markers could be placed in 12 linkage groups corresponding to the 12 chromosomes. The map presented herein is relevant to the genomes of cultivated C. annuum and wild C. annuum (as well as related Capsicum species) which differ by a reciprocal chromosome translocation. This map is also unique in that it is largely based on COSII markers, which permits the inference of a detailed syntenic relationship between the pepper and tomato genomes-shedding new light on chromosome evolution in the Solanaceae. Since divergence from their last common ancestor is approximately 20 million years ago, the two genomes have become differentiated by a minimum number of 19 inversions and 6 chromosome translocations, as well as numerous putative single gene transpositions. Nevertheless, the two genomes share 35 conserved syntenic segments (CSSs) within which gene/marker order is well preserved. The high resolution COSII synteny map described herein provides a platform for cross-reference of genetic and genomic information (including the tomato genome sequence) between pepper and tomato and therefore will facilitate both applied and basic research in pepper. This article was published in Theor Appl Genet and referenced in Journal of Plant Biochemistry & Physiology

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