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Genetic Diversity in the Batini Barley Landrace from Oman: I.‎ Spike and Seed Quantitative and Qualitative Traits

The Batini landrace of barley (Hordeum vulgare L.‎) is endemic to the coastal Batinah region of Oman.‎ Although it is important to sub- sistence farmers, it is threatened by increasing salinity and replacement by high yielding cultivars.‎ Seven bulk seed samples (subpopulations) of the Batini landrace were collected from farmers’ fields, which pro- vided a germplasm collection of 3191 accessions.‎ The objectives of this study were to characterize these accessions for spike and seed qualita- tive and quantitative traits, quantify phenotypic diversity, and explore significant variation in seed and spike morphological traits for future selection and breeding.‎ Variation for 26 morphological traits was assessed among the progeny of 3191 single spikes.‎ Phenotypic diversity indices (H') differed significantly among traits and subpopulations.‎ Weighted H' average for subpopulations was 0.‎501;‎ it ranged from 0.‎154 for spike glaucousness to 0.‎853 for number of spikelets per spike.‎ Differences in phenotypic frequencies for 20 traits were sufficient to discriminate between subpopulations.‎ Total genetic variation (HT) for quantitative (0.‎717)‎ and qualitative (0.‎533)‎ traits differed significantly.‎ Variance component due to subpopulations was significant for seven quantitative and 12 qualitative traits, and the within-subpopulation variance component decreased in the order: qualitative (82.‎12%)‎ > quantitative (78.‎34 )‎ > spike-related (68.‎50)‎ > grain-related (67.‎25)‎ traits.‎ Total genetic variation and genetic differentiation estimates for qualitative traits were 25% lower than for quantitative traits.‎ Strong, nonrandom trait associations among four seed phenotypic markers showed a hierarchical pattern, indicating an adaptive response to environmental conditions and human selection.‎ The long history of in situ conservation of this landrace in a multitude of subsistence farming systems, undoubtedly, contributed to the high variability.‎

Authors: 
A.‎ A.‎ Jaradat, M.‎ Shahid, and A.‎ Y.‎ Al Maskri
Year: 
۲۰۰٤
Publication type: 
Scientific Paper
Publication Source: 
Crop Science Society of America
Volume/Chapter/Issue: 
٤٤
Page Number: 
۳۰٤-۳۱۵