Abstract
In 1992, 465 individual spikes of bread wheat were collected from 24 sites in three states of Mexico. They were examined for 15 morphological, agronomic and grain quality attributes as part of the routine regeneration process conducted by the CIMMYT Wheat Genetic Resources Program in unreplicated hill plots in a screen house. A pattern analysis (combined use of classification and ordination methods) of the data provided a good description of the accessions and the collection sites. Since economically useful attributes were used the analysis provided relevant information for both potential users and the germplasm curators. Potential users have a description of the accessions from which to choose relevant breeding material and curators can assess how well the accessions represent the diversity in the collection sites. The analysis would not have been possible if the individual spikes from collection sites were bulked as is the common practice.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Anon., 1985. Revised descriptor list for wheat (Triticum spp.). IBPGR Secretariat & CEC Secretariat, Rome & Brussels.
Anon., 1991. Managing global genetic resources. The U.S. national plant germplasm system. National Academy Press, Washington, D.C.
Anon., 1995. Manual of operations and procedures of the International rice genebank. IRRI, Los Banos, Phillipines.
Burr, E.J., 1968. Cluster sorting with mixed character types. I. Standardization of character values. Australian Computer J. 1: 97–99.
Burr, E.J., 1970. Cluster sorting with mixed character types. II. Fusion strategies. Australian Computer J. 2: 98-103.
DeLacy, I.H., K.E. Basford, M. Cooper, J.K. Bull & C.G. McLaren, 1996. Analysis of multi-environment trials-an historical perspective. pp. 39-124. In: M. Cooper & G.L. Hammer (Eds.), Plant Adaptation and Crop Improvement, CAB International, IRRI and ICRISAT, Wallingford.
Eckart, C. & G. Young, 1936. The approximation of one matrix by another of lower rank. Psychometrika 1: 211-218.
Evenson, R.E. & S. Lemaire, 1998. Optimal collection and search for crop genetic resources. pp. 79-92. In: M. Smale (ed.) Farmers, Gene Banks and Crop Breeding: Economic Analyses of Diversity inWheat, Maize, and Rice, Kluwer Academic Publishers, London.
Gabriel, K.R., 1971. The biplot-graphical display of matrices with application to principal component analysis. Biometrika 58: 453-467.
Gollin, D., M. Smale & B. Skovmand, 1998. Optimal search in ex situ collections of wheat genetic resources. CIMMYT Economics Working Paper 98-03, Mexico D.F., CIMMYT.
Gower, J.C., 1966. Some distance properties of latent root and vector methods used in multivariate analysis. Biometrika 53: 325-338.
Gower, J.C., 1967. Multivariate analysis and multidimensional geometry. The Statistician 17: 13-28.
Hede, A.R., B. Skovmand, M.P. Reynolds, J. Crossa, A.L. Vilhelmsen & O. Stolen, 1999. Evaluating genetic diversity for heat tolerance traits in Mexican wheat landraces. Genet. Resour. Crop Evol. 46: 37-45.
Hodgkin, T.A., H.D. Brown, ThJ.L. van Hintum, E.V.A. Morales & A. McCusker, 1995. Preface. p. In: T. Hodgkin, A.H.D. Brown, T.J.L. van Hintum, E.V.A. Morales & A. McCusker (Eds.), Core Collections of plant genetic resources. John Willey and Sons, Chicester.
Mackay, M.C., 1990. Strategic planning for effective evaluation of plant germplasm. pp. 21-25. In: J.P. Srivastava & A.B. Damania (Eds.) Wheat Genetic Resources: Meeting Diverse Needs, John Wiley & Sons, Chichester.
Skovmand, B., A.R. Hede & J. Huerta, 1997. Introduction of Mediterranean wheat landraces to Mexico and their adaptation. p. In: A.B. Damania & J. Valkoun (Eds.), The Harlan Symposium, 10-14 May Allepo, Syria. Book of Abstracts. ICARDA, Allepo, Syria.
Ward, J.H., 1963. Hierarchical grouping to optimise an objective function. J. American Statistical Association 58: 236-244.
Watson, S.L., I.H. DeLacy, D.W. Podlich, and K.E. Basford, 1996. GEBEI. An analysis package using agglomerative hierarchical classificatory and SVD ordination procedures for genotype x environment data. Version 2 for DOS. p. 39. In: (ed.) Centre for Statistics Research Report #57. Department of Mathematics, The University of Queensland, Brisbane, Australia.
Williams, W.T., 1976. Pattern Analysis in Agricultural Science. Elsevier Scientific Publishing Company, Amsterdam.
Wishart, D., 1969. An algorithm for hierarchical classification. Biometrics 25: 165-170.
Rights and permissions
About this article
Cite this article
DeLacy, I., Skovmand, B. & Huerta, J. Characterization of Mexican wheat landraces using agronomically useful attributes. Genetic Resources and Crop Evolution 47, 591–602 (2000). https://doi.org/10.1023/A:1026550624037
Issue Date:
DOI: https://doi.org/10.1023/A:1026550624037