caa a22 4500 475793617 CHVBK 20180406123717.0 cr unu---uuuuu 170329e20001101xx s 000 0 eng 10.1007/s001220051593 doi (NATIONALLICENCE)springer-10.1007/s001220051593 The effect of the accumulation of disease resistance genes on the long-term association of a global sample of environments for testing spring bread wheat [Elektronische Daten] [I. H. DeLacy, S. Rajaram, M. Cooper, P. N. Fox, K. E. Basford] Abstract : CIMMYT (the International Maize and Wheat Improvement Center) has routinely conducted international wheat yield trials to study the adaptation of spring bread wheat. The first of these, the International Spring Wheat Yield Nursery (ISWYN), was conducted for 31years from 1964 to 1994 inclusive (30 cycles were conducted as no nursery was distributed in 1993 because of Karnal Bunt). Recently, pattern analysis methods have been developed and a set of computer programs written, which enable retrospective analyses of such historical databases to appraise the relationships among test environments in a way that discriminates among genotypes. Such an analysis was conducted on the 30 years of yield data from ISWYN and the classification derived from these analyses was compared with an agroecological classification of spring wheat test environments derived by CIMMYT. The incidence of foliar diseases (stem rust, leaf rust, yellow rust, Septoria spp. and Fusarium spp.) was important in the distinction between the high-rainfall low-latitude (mega-environment 2) and the high-input-irrigated low-latitude (mega-environment 1) environment types. The accumulation of resistance genes for these diseases has been an objective of the CIMMYT wheat breeding program. It was hypothesized that, as the relevant resistance genes were successfully pyramided into the germplasm, the distinction between these two mega-environment types would disappear. The results of the retrospective analyses support this hypothesis. Springer-Verlag Berlin Heidelberg, 2000 Keywords CIMMYT nationallicence ISWYN nationallicence Mega-environments nationallicence Retrospective analysis nationallicence Pattern analysis nationallicence DeLacy I. H. School of Land and Food Sciences, The University of Queensland, Brisbane, 4072, Australia e-mail: I.delacy@mailbox.uq.edu.au Fax: +61 7 33651188, AU aut Rajaram S. International Maize and Wheat Improvement Center, Apdo. Postal 6-641, 06600 Mexico, D.F., Mexico, MX aut Cooper M. School of Land and Food Sciences, The University of Queensland, Brisbane, 4072, Australia e-mail: I.delacy@mailbox.uq.edu.au Fax: +61 7 33651188, AU aut Fox P. N. International Maize and Wheat Improvement Center, Apdo. Postal 6-641, 06600 Mexico, D.F., Mexico, MX aut Basford K. E. School of Land and Food Sciences, The University of Queensland, Brisbane, 4072, Australia e-mail: I.delacy@mailbox.uq.edu.au Fax: +61 7 33651188, AU aut https://doi.org/10.1007/s001220051593 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s001220051593 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- DeLacy I. H. School of Land and Food Sciences, The University of Queensland, Brisbane, 4072, Australia e-mail: I.delacy@mailbox.uq.edu.au Fax: +61 7 33651188, AU aut NATIONALLICENCE 700 1- Rajaram S. International Maize and Wheat Improvement Center, Apdo. Postal 6-641, 06600 Mexico, D.F., Mexico, MX aut NATIONALLICENCE 700 1- Cooper M. School of Land and Food Sciences, The University of Queensland, Brisbane, 4072, Australia e-mail: I.delacy@mailbox.uq.edu.au Fax: +61 7 33651188, AU aut NATIONALLICENCE 700 1- Fox P. N. International Maize and Wheat Improvement Center, Apdo. Postal 6-641, 06600 Mexico, D.F., Mexico, MX aut NATIONALLICENCE 700 1- Basford K. E. School of Land and Food Sciences, The University of Queensland, Brisbane, 4072, Australia e-mail: I.delacy@mailbox.uq.edu.au Fax: +61 7 33651188, AU aut Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer