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vol.64 número4Avaliação das cultivares Mundo Novo, Bourbon Amarelo e Bourbon Vermelho de Coffea arabica L. em Campinas, SPHíbridos de milho inter e intrapopulacionais obtidos a partir de populações S0 de híbridos simples comerciais índice de autoresíndice de assuntospesquisa de artigos
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Bragantia

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

Resumo

CONCEICAO, Albano Silva da; FAZUOLI, Luiz Carlos  e  BRAGHINI, Masako Toma. Evaluation and selection of Coffea arabica F3 progenies with low height and the leaf-rust SH3 resistence gene. Bragantia [online]. 2005, vol.64, n.4, pp.547-559. ISSN 0006-8705.  http://dx.doi.org/10.1590/S0006-87052005000400004.

The present work evaluated 36 arabic coffee (Coffea arabica L.) F3 progenies, originated from crosses among cultivars Catuaí Vermelho IAC 46 and Catuaí Vermelho IAC 81 and access IAC 1110 (BA-10). This last cultivar came from India and exhibits SH2 and SH3 rust resistance genes. The experiment was installed in 1988 at the Experimental Center of the Agronomic Institute (IAC/APTA), in Campinas, using random blocks design with six repetitions and two plants per plot. Field evaluations included yield (average of seven annual harvests), vegetative vigor, resistance to leaf rust, plant size, color of young leaves and complete fruit maturation period. Based on these evaluations, plants exhibiting high yield, good vegetative vigor, low height, and resistance to the leaf rust agent Hemileia vastatrix were selected. Fruit yield of selected plants was calculated and seeds were characterized according to type (flat, peaberry and elephant), outturn and grain size. A total of 11 optimal F3 progenies were identified as rust resistant. By further classifications, 39 plants out from these progenies were selected, along with 15 plants from other 25 evaluated progenies. Laboratory analyses lead to a final selection of 18 coffee trees, all exhibiting leaf rust resistance, high yield and low height. Also, F4 progenies of selected plants had been evaluated regarding height and leaf rust resistance, at seedling stage, in greenhouse conditions. Eighteen plants were selected for further analysis and move forward from F3 to F4 generation in the coffee breeding program developed by IAC.

Palavras-chave : Coffee; selection; rust resistance; SH3 gene.

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