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Relationship between the number of partial resistance genes and the response to leaf rust in wheat genotypes

Lourdes Ledesma-Ramírez1, Ernesto Solis-Moya1*, Juan G. Ramírez-Pimentel2, Susanne Dreisigacker3, Julio Huerta-Espino4, Cesar L. Aguirre-Mancilla2, and Luis A. Mariscal-Amaro1

The adult plant resistance conferred by genes with an additive effect is an alternative to achieve durable resistance to leaf rust caused by the fungus Puccinia triticina in wheat (Triticum spp.) The objective of this study was to know the response to this disease in bread wheat genotypes that possess the partial resistance genes Lr34, Lr46, Lr67 and Lr68. The severity level of the disease was measured in 280 wheat genotypes in three locations. The presence or absence of partial resistance genes was determined by molecular markers for each gene in 245 wheat genotypes. The different combinations of adult plant genes resulted in the genotypes were classified into nine groups. In 77 of these genotypes, the markers were negative for these genes.The Lr34, <em">Lr46, Lr67 and Lr68 genes were identified individually in 48, 48, 5, and 14 genotypes, respectively. The combination of two genes, Lr34+Lr46, Lr34+Lr68 and Lr46+Lr68, was determined in 18, 17, and 12 genotypes, respectively. Only in six genotypes the combination Lr34+Lr46+Lr68 was identified. The genotypes with the Lr34, Lr46, Lr67 and <em">Lr68 genes in a unique form showed 21%, 24.8%, 21.9% and 21.8% of rust severity on average, respectively. An additive effect was observed in the combinations of two genes, and higher effect in the combinations that included the Lr34 gene since genotypes with this gene combination showed on average 11.4% of rust severity. The combination of three genes Lr34+Lr46+Lr68 provide greater protection in the genotypes with 9.7% of rust severity on average.

Key words: Adult plant resistance, phenotype, severity, slow-rusting, Triticum aestivum.

1Instituto Nacional de Investigaciones Forestales, Agrícolas y Pecuarias (INIFAP), Campo Experimental Bajío, km 6.5, Carr. Celaya-San Miguel C. P. 38110, Celaya, Guanajuato, México. *Corresponding author (solis.ernesto@inifap.gob.mx).
2Instituto Tecnológico de Roque, km 8 Carretera Celaya-Juventino Rosas, A.P. 508, C.P. 38110, Celaya, Guanajuato, México.
3Centro Internacional de Mejoramiento de Maíz y Trigo (CIMMYT), km 45, Carr. México-Veracruz, El Batán, C.P. 56237, Texcoco, Estado de México, México.
4Instituto Nacional de Investigaciones Forestales, Agrícolas y Pecuarias (INIFAP), Campo Experimental Valle de México, A.P. No. 10, C.P. 56230, Chapingo, Estado de México, México.

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