Combining ability for nodulation in common bean (Phaseolus vulgaris L.) genotypes from Andean and Middle American gene pools |
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Authors: | Marília Caixeta Franco Sérvio Tulio Cassini Valter Rodrigues Oliveira Clibas Vieira Siu Mui Tsai Cosme Damiao Cruz |
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Institution: | 1. Centro de Energia Nuclear na Agricultura (CENA-USP), Av. Centenário 303, CP. 96, 13400-970, Piracicaba, S?o Paulo, Brazil 2. Centro Tecnologico, DHS, UFES, 29060-970, Vitoria, ES, Brazil 3. Centro Tecnológico do Centro-Oeste, Empresa de Pesquisa Agropecuária de Minas Gerais, CP. 295, 35701-970, Sete Lagoas, Minas Gerais, Brazil 4. Departamento de Fitotecnia, UFV, 36571-000, Vi?osa, Minas Gerais, Brazil
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Abstract: | Ten F1's obtained from crosses among five common bean genotypes of Andean (WAF 15, Mineiro Precoce and Batatinha) and Middle American
(BAT 304 and Ouro) gene pools were assessed for their combining abilities for root nodulation with Rhizobium tropici strain CIAT 899. The plants were grown under controlled conditions and evaluated for number of nodules per plant (NN), nodule
dry weight (NDW), mean nodule weight (MNW) and plant fresh weight (PFW). The subdivision of the treatment effects on the general
(GCA) and specific combining effects (SCA) were performed according to Griffing's diallel analysis method 2, model 1. The
analyses of variance and estimates of quadratic components showed that non-additive gene effects were more important in the
expression of NN and PFW, whereas additive gene effect was predominant for NDW and MNW. A close association was observed between
high number of nodules and GCA. Generally, crosses involving parents of different gene pools yielded hybrids with high positive
estimates of SCA for all assessed traits. The genotypes of Andean origin WAF 15 and Mineiro Precoce are the most promising
parents for breeding programs to increase NN and NDW in common beans.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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Keywords: | breeding common bean diallel analysis nodulation Phaseolus vulgaris L Rhizobium tropici |
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