Summary
A durum wheat world collection of 349 entries has been used to study the amount and distribution of genetic variability based on isoenzymatic characters involving a minimum of 13 loci. Genetic variability has been studied in a hierarchical fashion: between origins and within origins, further divided into between entries per origin and within entries. Factorial analysis of correspondences and chi-square distance were the basic statistical tools. The effect of domestication is deduced by comparing isozymic frequencies between wild emmer and durum wheat. It involves changes in frequencies mainly towards the accumulation of “null” alleles. The richest origins of genetic variation for durum wheat were Iran, Mexico, Ethiopia, Egypt and Afghanistan. Generally, between-entry variability was larger than the withinentry component. Exceptions were the accessions from Mexico, Greece, Argentina and Cyprus. The relationships between origins were greatly affected by their within-variability, the logic in the grou** is mostly along geographical or political lines. Egypt might be considered a microcenter of diversity for durum wheat within the Mediterranean center, although it is certainly related to Ethiopia (included in the Abisinic center). Mexico has become a new microcenter of diversity, quite likely man-made, and is distant from other centers of durum wheat diversity as far as gene frequency is concerned.
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References
Asins MJ (1983) Genetic and phylogenetic studies in diploid and tetraploid species of genus Triticum by the analysis of peroxidase and phosphatase isozymes. Universidad Complutense, Madrid
Asins MJ, Carbonell EA (1986a) A comparative study on variability and phylogeny of Triticum species. 1. Intraspecific variability. Theor Appl Genet 72:551–558
Asins MJ, Carbonell EA (1986b) A comparative study on variability and phylogeny of Triticum species. 2. Interspecific relationships. Theor Appl Genet 72:559–568
Asins MJ, Carbonell EA (1987) Concepts involved in measuring genetic variability and its importance in conservation of plant genetic resources. Evolutionary Trends in Plants 1:51–62
Asins MJ, Perez de la Vega M (1985a) The inheritance of tetraploid wheat seed peroxidases. Theor Appl Genet 71:61–67
Asins MJ, Pérez de la Vega M (1985b) Inheritance of endosperm phosphatases in durum wheat. Z Pflanzenzücht 95:319–324
Asins MJ, Benito C, Pérez de la Vega M (1981) Endosperm peroxidase electrophoresis patterns to distinguish tetraploid from hexaploid wheats. Euphytica 30:389–392
Bekele E (1985) The biology of cereal land race populations. Hereditas 103:119–134
Benito C, Pérez de la Vega M (1979) The chromosomal location of peroxidase isozymes of the wheat kernel. Theor Appl Genet 55:73–76
Benzecri JP (1970) Distance distributionelle et metrique chideux en analyse factorielle des correspondances. Laboratoire de Statistique Math., Paris
Benzecri JP, Benzecri F (1980) Practique de l'analyse des données. 1. Analyse des correspondences. Exposé elementaire. Dunod, Paris
Brown AHD (1978) Isozymes, plant population genetic structure and genetic conservation. Theor Appl Genet 52: 145–157
Darwin C (1970) The origin of species (1859). In: Appleman P (ed) Darwin. Norton and Company, New York, pp 98–199
Duvick DN (1984) Genetic diversity in major farm crops on the farm and in reserve. Econ Bot 38:161–178
Feldman M (1976) Wheats. In: Simmonds NW (ed) Evolution of crop plants. Longman, London, pp 120–128
Ghaderi A, Adams MW, Nassib AM (1984) Relationship between genetic distance and heterosis for yield and morphological traits in dry edible bean and faba bean. Crop Sci 24:37–43
Holden JHW (1984) The second ten years. In: Holden JHW, Williams JT (eds) Crop genetic resources: Conservation and evaluation. Allen and Unwin, Winchester/MA, pp 276–285
Jain SK, Qualset CO, Bhatt GM, Wu KK (1975) Geographical patterns of phenotypic diversity in a world collection of durum wheats. Crop Sci 15:700–704
Kobrehel K, Laignelet B, Feillet P (1972) Relation entre les activités peroxidasiques et polyphenoloxydasiques des bles durs et la brunissement des pâtes alimentaires. CR Séances Acad Agric Fr 14:1099–1106
Lance GN, Williams WT (1967) Mixed-data classificatory programs. 1. Agglomerative system. Aust Comp J 1:15–20
Salinas J, Pérez de la Vega M, Benito C (1982) Identification of hexaploid wheat cultivars based on isozyme patterns. J Sci Food Agric 33:221–226
Spagnoletti Zeuli PL, Qualset CO (1987) Geographical diversity for quantitative spike characters in a world collection of durum wheat. Crop Sci 27:235–241
Vavilov NI (1951) Phytogeographic basis of plant breeding. The origin, variation, immunity and breeding of cultivated plants. Chronica Bot 13:1–366
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Communicated by P.M.A. Tigerstedt
The experimental part of this study was carried out at the Department of Genetics, Fac. Biologia, Universidad Complutense, Madrid, Spain
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Asins, M.J., Carbonell, E.A. Distribution of genetic variability in a durum wheat world collection. Theoret. Appl. Genetics 77, 287–294 (1989). https://doi.org/10.1007/BF00266199
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DOI: https://doi.org/10.1007/BF00266199