Gliadin genotypes worldwide for spring wheats (Triticum aestivum L.) 2. Strong differentiation of polymorphism between countries and regions of origin. (May 2019)

• Record Type: Journal Article
• Authors: Metakovsky, E.; Melnik, V.A.; Pascual, L.; Wrigley, C.W.
• Is Part Of: Journal of cereal science. Volume 87(2019)
• Page Start: 311
• Page End: 317
• Publication Date: 2019-05
• Subjects: Gliadin alleles -- Wheat-gene geography -- Genetic diversity -- History; Grain -- Periodicals; Cereal products -- Periodicals; Céréales -- Périodiques; Produits céréaliers -- Périodiques; Cereal products; Grain; Periodicals; 664.705
• DOI: 10.1016/j.jcs.2019.04.015
• Languages: English
• ISSNs: 0733-5210

Abstract

Abstract: Genotypes of 290 cultivars from ten countries (four continents) of spring wheat Triticum aestivum, were analyzed through the identification of alleles at the gliadin-encoding ( Gli ) loci. The group of cultivars bred in one country during the 20th century might be characterized by its level of genetic diversity ( H ) and a specific set of alleles. Strong differences between genotypes of cultivars bred in different countries were confirmed by cluster analysis of genetic distances. Genotypes of cultivars bred in regions of the same country might differ, but they always composed a single cluster and strongly differed from genotypes from other countries or regions. Therefore, world polymorphism of spring wheat germplasm of the 20th century is highly structured and differentiated between countries and their regions. This differentiation seems to be mainly a result of natural selection acting in different ways in different eco-climatic conditions of breeding and propagation. At a regional scale, statistically significant temporal changes in frequency of some gliadin alleles and a tendency to temporal decrease of overall genetic diversity were discovered in cultivars bred in each of seven regions studied in Australia, Canada and the former USSR. In regions of Canada (provinces of Manitoba and Ontario) and of the former USSR (Saratov), a statistically significant decay of the genetic diversity of cultivars bred during the 20th century was discovered. However, the influence of breeders' selection for end-use wheat quality on the wheat genetic diversity was the least, if any. Highlights: Gliadin genotypes of 299 world-wide T. aestivum cultivars and accessions are compared. Genetic distances between groups of cultivars from different countries are very long. The 20th-century's wheat polymorphism is highly structured among countries and regions. There was a statistically confirmed genetic erosion of polymorphism in two regions. Differentiation of polymorphism is not necessarily a result of breeders' selection for quality.