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Bragantia

versão impressa ISSN 0006-8705versão On-line ISSN 1678-4499

Resumo

FELICIO, João Carlos; CAMARGO, Carlos Eduardo de Oliveira; CHAVES, Márcia Soares  e  CASTRO, Jairo Lopes de. Leaf rust resistance and grain yield potential in wheat genotypes. Bragantia [online]. 2008, vol.67, n.4, pp.855-863. ISSN 0006-8705.  http://dx.doi.org/10.1590/S0006-87052008000400007.

Eighteen wheat genotypes obtained from crosses between the parental line BH1146//AA"S"/WIN"S" originated from interespecific crosses between Triticum aestivum L. and Triticum durum L. and the cultivars IAC 289 and IAC 1004 were evaluated in experiments carried out in upland conditions at Manduri (Zone A); Capão Bonito and Itapeva (Zone B) and Paranapanema (Zone C), in the State of São Paulo, Brazil, during 2003-2005 crop seasons. The evaluation of the genotypes to the causal agent of leaf rust was made at the seedling stage in greenhouse, where the genotypes were individually inoculated with spores of 12 races of Puccinia triticina, which represented the spectrum of pathogen virulence occurring in Brazil and under natural infection out in the field. Grain yield of each genotype was evaluated in the different regions and in a group of experiments, as well as the stability and adaptability. The genotypes 8 (BH1146// AA"S"/WIN"S"/3/BUC/FKL//MYNA/VUL), 12 and 14 (BH1146//AA"S"/WIN"S"/3/VEE //DOVE/BUC) showed resistance the physiologic races of Puccinia triticina in greenhouse in the seedling stage. The genotypes 4, 5, 8, 12, 13, 16 e 20 and the cultivar IAC 1004 (T. durum) presented leaf rust resistance, under natural disease infection conditions. The highest grain yields were obtained by the genotypes 8 (BH1146// AA"S"/WIN"S"/3/BUC/FKL//MYNA/VUL), 7 (BH1146//AA"S"/WIN"S"/3/HANN*2/ PRL) and 18 (CMH75.A.66/SERI/ 3/BH1146// AA"S"/WIN"S"). Genotype 16 (KAUZ/3/ BH1146//AA"S"/WIN"S") presented the lowest yield.

Palavras-chave : Triticum aestivum L. and Triticum durum L; resistance to leaf rust; yield stability and adaptability.

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