Resumo

SOLIS-MOYA, Ernesto et al. Resistance to leaf rust in wheat (Triticum spp. L.) varieties adapted to El Bajío, México. Agrociencia [online]. 2013, vol.47, n.5, pp.457-469. ISSN 2521-9766.

Leaf rust caused by Puccinia triticina is one of the main diseases of wheat (Triticum spp. L.) in México. Through breeding it is possible to incorporate resistance genes in seedling and adult plant that maintain resistance to leaf rust for long periods of time. The objective of this study was to postulate genes of seedling and determine adult plant resistance to leaf rust in wheat varieties recommended for El Bajío, México. The genes in seedlings were postulated, under greenhouse conditions, in 11 varieties and in the field adult plant resistance was determined. In durum wheat, genes Lr10 and 23 were postulated and one not identified. Lr10 and 23 in seedling and adult plant are ineffective to race BBG/BN that overcame the resistance of durum wheat varieties grown in México. In the eight bread wheat varieties the resistance genes Lr1, 3, 3bg, 10, 13, 14a, 16, 17, 23, 27 and 31, alone or in combinations were postulated. These do not differ substantially from those postulated in the varieties released in México until 1990. In the field tests adult plant resistance was identified as different from that of the seedling, but at levels that should be improved with larger number of durable resistance genes and diversifying the sources of resistance.

Palavras-chave : resistance genes; Puccinia triticina; adult plant; seedling.

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