Plant Genetic Resources: Characterization and Utilization

Research Article

Population and multilocus isozyme structures in a barley landrace

A.A. Jaradata1 c1 and M. Shahida2

a1 USDA-ARS, 803 Iowa Avenue, Morris, MN 56267, USA

a2 Plant Genetic Resources Program, International Center for Biosaline Agriculture (ICBA), P.O. Box 14660, Dubai, United Arab Emirates

Abstract

Isozyme data were used to assess genetic diversity within and among a subdivided population of the salt-tolerant Batini barley landrace. Population diversity and its components were estimated on the basis of 12 isozymes scored on 450 single plants representing seven subpopulations. Two principal components, based on mean gene diversity, Shannon's diversity index, percentage polymorphic loci, genetic identity and genetic distance among subpopulations accounted for 91.7% of total variation and separated the subpopulations into four distinct groups. Contributions to total diversity by individual subpopulations were partitioned into intra- and inter-population components. The level of population differentiation indicates that a large percentage of total genetic diversity was apportioned within subpopulations. The presence of valuable genetic diversity in this landrace was confirmed.

(Received May 02 2005)

(Accepted September 22 2005)

Correspondence:

c1 *Corresponding author: E-mail: jaradat@morris.ars.usda.gov

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