2012 journal article

Comparative mapping in intraspecific populations uncovers a high degree of macrosynteny between A- and B-genome diploid species of peanut

BMC GENOMICS, 13.

By: Y. Guo *, S. Khanal *, S. Tang*, J. Bowers *, A. Heesacker*, N. Khalilian*, E. Nagy *, D. Zhang * ...

author keywords: Peanut (Arachis hypogaea); SSR; Genetic linkage map; Intraspecific cross; EST
MeSH headings : Alleles; Arachis / classification; Arachis / genetics; Biological Evolution; Chromosome Mapping; Diploidy; Expressed Sequence Tags; Genetic Linkage; Genetic Markers; Genome, Plant; Microsatellite Repeats; Polymorphism, Genetic; Polyploidy; Quantitative Trait Loci; Sequence Analysis, DNA; Synteny
topics (OpenAlex): Peanut Plant Research Studies; Coconut Research and Applications; Nitrogen and Sulfur Effects on Brassica
TL;DR: This work comparatively mapped the A- and B-genome diploid species of Arachis using intraspecific F2 populations to contribute to understanding tetraploid peanut genome origin and evolution and eventually promote its genetic improvement. (via Semantic Scholar)
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Cultivated peanut or groundnut (Arachis hypogaea L.) is an important oilseed crop with an allotetraploid genome (AABB, 2n = 4x = 40). Both the low level of genetic variation within the cultivated gene pool and its polyploid nature limit the utilization of molecular markers to explore genome structure and facilitate genetic improvement. Nevertheless, a wealth of genetic diversity exists in diploid Arachis species (2n = 2x = 20), which represent a valuable gene pool for cultivated peanut improvement. Interspecific populations have been used widely for genetic mapping in diploid species of Arachis. However, an intraspecific mapping strategy was essential to detect chromosomal rearrangements among species that could be obscured by mapping in interspecific populations. To develop intraspecific reference linkage maps and gain insights into karyotypic evolution within the genus, we comparatively mapped the A- and B-genome diploid species using intraspecific F2 populations. Exploring genome organization among diploid peanut species by comparative mapping will enhance our understanding of the cultivated tetraploid peanut genome. Moreover, new sources of molecular markers that are highly transferable between species and developed from expressed genes will be required to construct saturated genetic maps for peanut.