Isozyme variation and species relationships in peanut and its wild relatives (Arachis L. — Leguminosae)

Lu, J. and Pickersgill , B. (1993) Isozyme variation and species relationships in peanut and its wild relatives (Arachis L. — Leguminosae). Theoretical and Applied Genetics, 85 (5). pp. 550-560.

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Arachis hypogaea is an AABB allotetraploid whose precise ancestry is not yet clear. Its closest diploid relatives are the annual and perennial wild species included with it in the section Arachis. Variation in these species for 11 different enzymes was studied by starch-gel electrophoresis. Differences attributed to at least 13 genetic loci were found among eight enzymes, while three enzymes appeared uniform throughout the section. Values for Nei's genetic distance were calculated for all pairs of species and were used to estimate relationships. All diploid species, apart from two whose validity had previously been questioned could be distinguished by their overall zymotypes, but few contained unique alleles. When species were grouped by their mean genetic distances, they formed two clusters, which agreed reasonably well with the division of the section into annual versus perennial species. The single B-genome species was an outlier within the annual group. A. hypogaea showed fixed heterozygosity at four loci (in subsp. hypogaea) or six loci (in subsp. fastigiata), which agrees with previous conclusions that groundnut is an allotetraploid. None of the diploids included in this survey could be conclusively identified as donors of either the A or the B genome to the tetraploids. The two sub-species of A. hypogaea differed consistently in two of the thirteen putative loci studied. This may call into question the simple hypothesis that A. hyopogaea originated from just two diploid species

Item Type: Article
Additional Information: SNNigam collections
Author Affiliation: Department of Agricultural Botany, School of Plant Sciences, University of Reading, Reading, RG6 2AS, UK
Subjects: Plant Protection
Crop Improvement
Divisions: Groundnut
Depositing User: Mr T L Gautham
Date Deposited: 02 Sep 2013 05:02
Last Modified: 02 Sep 2013 05:02
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