Geographical patterns of phenotypic diversity in a world collection of durum wheats.

Jain, S.K. and Qualset, C.O. and Bhatt, G.M. and Wu, K.K. (1975) Geographical patterns of phenotypic diversity in a world collection of durum wheats. Crop Science , 15 (5). pp. 700-704.

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More than 3000 Triticum durum entries from the USDA world wheat collection were grown in the field and classified for leaf-sheath glossiness, glume pubescence and colour, awn and kernel colour, and basal-spike node fertility. The entries were grouped by geographic origin, and the frequencies of the phenotypes examined. Variation for all characters was found, and usually within each geographic region. The number of entries in the collection was very small from some areas known to be important sources of germplasm, pointing to the importance of intensifying efforts in exploration and conservation. The Shannon-Weaver diversity index (H') was used to examined overall genetic divergence on a country and regional basis. Of the large collections, those from Ethiopia and Portugal had the greatest diverity (H' = 0.87 and 0.86), and those from Turkey, Bulgaria, and the United States had significantly less diversity (H' = 0.50, 0.42 and 0.39). Based on the characters studied and the relatively small collection evaluated, the centres of diversity seem to be Ethiopia, the Mediterranean region, and India.

Item Type: Article
Uncontrolled Keywords: Triticum turgidum l., Tetraploid wheat, Germplasm conservation, Diversity index
Author Affiliation: Department of Agronomy and Range Science, University of California, Davis,USA.
Subjects: Crop Improvement
Divisions: Other Crops
Depositing User: Mr Arbind Seth
Date Deposited: 20 Dec 2012 06:24
Last Modified: 20 Dec 2012 06:24
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