Submitted to: Agronomy Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: November 14, 2002
Publication Date: November 14, 2002
Citation: JARADAT, A.A. THE OMANI BARLEY LANDRAC BAHTINI: II. DIVERSITY OF ISOZYME MARKERS. CD-ROM. MADISON, WI: AGRONOMY ABSTRACTS. 2002. Technical Abstract: Patterns of variation, based on ten isozyme loci, were used in characterizing seven ecotypes of the salt tolerant "Bahtini" Omani barley landrace. A total of 22 alleles were observed on all ten isozyme loci; all were polymorphic except for Pgd-1. Seven of the loci were found to be common widespread, three common sporadic, six common localized and six rare localized. Total gene diversity within ecotypes (0.332) was partitioned into average gene diversity within (0.267) and among (.0646) ecotypes. Gene diversity among ecotypes relative to total gene diversity was 0.1946. Three esterase loci (Est1, Est2 and Est4) had the highest average gene diversities (0.552, 0.542 and 0.432, respectively). Three of the seven ecotypes showed unique esterase isozyme genotypes. The unbiased estimates of genetic distances between ecotypes ranged from 0.0321 to 0.294 and separated all seven ecotypes into four distinct subgroups. Results of the study will be utilized in maximizing genetic diversity in germplasm collections of this landrace threatened by increasing salinity in the irrigation water.