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Comparison of the effect of leaf rust on the grain yield of resistant, partially resistant, and susceptible spring wheat cultivars

Published online by Cambridge University Press:  30 October 2009

R. P. Singh ,
T. S. Payne ,
P. Figueroa  and
S. Valenzuela
R. P. Singh
Affiliation:
Geneticist/Pathologist, International Maize and Wheat Improvement Center (CIMMYT), Lisboa 27, Apdo. Postal 6–641, 06600 Mexico D.F., Mexico.
T. S. Payne
Affiliation:
Winter Wheat Breeder, CIMMYT, P. K. 39 Emek, Ankara 06511, Turkey.
P. Figueroa
Affiliation:
Pathologists, Centro de Investigaciones Forestales y Agropecuarias, Cd. Obregon, Sonora, Mexico.
S. Valenzuela
Affiliation:
Pathologists, Centro de Investigaciones Forestales y Agropecuarias, Cd. Obregon, Sonora, Mexico.
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Abstract

Three hypersensitive resistant, six partially resistant (slow rusting), and one susceptible spring bread wheat (Triticum aestivum L.) cultivars were evaluated for grain yield, test weight, and kernel weight under artificially created epiphytotics of leaf rust disease (caused by Puccinia recondita f. sp. tritici) with and without fungicide protection for three years. Rusted plot yields were 4 percent lower compared to fungicide-protected plot yields for cultivars with hypersensitive resistance. In rusted plots, grain yield and kernel weight averaged 8 percent less for cultivars with partial resistance but varied from 2 to 20 percent less depending on cultivar. The susceptible check cultivar, Yecora 70, averaged 27 percent lower grain yield, 22 percent lower kernel weight, and 6 percent lower test weight in rusted plots. Slight reduction in test weight was also observed for each cultivar. Losses in grain yield could, therefore, be reduced to levels similar to those of hypersensitive resistant cultivars by the use of partial resistance. We discuss the sustainability of partial genetic resistance to leaf rust. Since partial resistance is expected to be durable, and since rust levels and effects on yield in farmers' fields are likely to be less than in this experimental plot study, partial resistance should give long-lasting resistance at a negligible cost in yield that is insufficient to justify the use of fungicides.

Keywords

CIMMYTdurable genetic resistancepartial resistancePuccinia recondita tritici
Type
Articles
Information
American Journal of Alternative Agriculture , Volume 6 , Issue 3 , September 1991 , pp. 115 - 121
Copyright
Copyright © Cambridge University Press 1991

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