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Combining abilities of some common bean (Phaseolus vulgaris L.) cultivars having different mechanisms of resistance to bean golden mosaic virus (BGMV)^*

Oscar Niceforo Vizgarra^I; Francisco José Morales^II; Magno Antônio Patto Ramalho^III

^IEEAOC, C.C. no. 9, 4101, Las Talitas, Tucumán, Argentina
^IICIAT, A.A. 6713, Cali, Colômbia
^IIIDepartamento de Biologia, Escola Superior de Agricultura de Lavras, Caixa Postal 37, 37200-000 Lavras, MG, Brasil. Send correspondence to M.A.P.R.

ABSTRACT

Adequate knowledge of combining ability and inheritance of has not been available for resistance to bean golden mosaic virus (BGMV) parental genotypes of common bean (Phaseolus vulgaris L.). An 8 x 8 complete diallel cross, including 28 crosses, their 28 reciprocals, and 8 parents was evaluated in the F₁ and F₂ generations, at Viclos (Tucuman), Argentina in 1990. Data were recorded on leaf yellowing (mosaic), number of pods and seeds/plant, seed weight and seed yield. Mean square values due to general combining ability (GCA) were highly significant and were larger than the estimates for specific combining ability (SCA) for all characters in the F₁ and F₂. Porrillo Sintetico proved to be one of the best parents for increased yield of the susceptible cultivar Alubia Cerrillos. However, Royal Red contributed to lower mosaic expression. Pinto 114, Great Northern and Red Mexican 36 significantly increased the number of pods and seeds per plant, as well.

Keywords: Combining abilities; Phaseolus vulgaris; Resistance; Bean golden mosaic virus; BGMV.

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* Part of a thesis presented by O.N.V. to Escola Superior de Agricultura de Lavras in fulfillment of the requirements for the Master's degree.