Phenotypic recurrent selection in the common bean (Phaseolus vulgaris L) with carioca-type grains for resistance to the fungi Phaeoisariopsis griseola

Abstract

The efficiency of recurrent selection was assessed in obtaining common bean (Phaseolus vulgaris L) plant lines resistant to the phytopathogenic fungi Phaeoisariopsis griseola. The base bean population was obtained from the partial diallel between seven lines with carioca-type grains and 10 sources of resistance to P. griseola. The plants most resistant to the pathogen were selected in the F 2 (S 0 ) generation of the populations (C-0). The best S 0:1 plants that presented carioca-type grains were intercrossed to obtain cycle I (C-I). The same procedure was adopted to obtain cycles C-II to C-V. In each recurrent selection cycle, S 0:1 progenies selected were also assessed in experiments carried out in Lavras, Brazil, always using as check the Carioca MG (susceptible to P. griseola) and Pérola (tolerant) cultivars. The response to selection for resistance to the pathogen was estimated from the general mean of the S 0:1 progenies from each selective cycle compared to the susceptible check Carioca MG. The estimated gain was 6.4% per cycle and the indirect response in grain yield by selection for resistance to the pathogen was 8.9% per cycle. The variability detected among the progenies in the last selective cycles enabled the prediction of additional responses to recurrent selection.

Inheritance of resistance to Fusarium oxysporum f. sp. phaseoli Brazilian race 2 in common bean

“…However, in lines of Mesoamerican origin similar to those used here, the authors evidenced the existence of polygene control of resistance. In contrast, Brick et al (2004) stated that different genes are involved in the genetic control of races 4 and 5 of F. oxysporum f. sp. phaseoli and that the dominant allele is responsible for the resistance of both races.…”

“…Estimates of heritability for resistance to other pathogens in common bean are frequent in the literature. Amaro et al (2007) evaluated angular leaf spot (Pseudocercospora griseola) using S 0:1 progenies and obtained varying heritability estimates, from 21.8% to 70.5%. Ribeiro et al (2007) also studied the genetic control of Asian soybean rust (Phakopsora pachyrhizi), using percentage of disease severity.…”

“…There are some reports of ge- netic control of resistance; the first was probably the study of Ribeiro & Hagedorn (1979), who identified the presence of only one gene with a dominant allele conferring resistance. More recently, other results were reported for the genetic control of resistance (Salgado et al, 1995;Cross et al, 2000;Brick et al, 2004). No report was found on the genetic control of resistance to this pathogen using exclusively germplasm developed in Brazil, nor any information about the use of the estimated mean and variance components to study this trait.…”

“…phaseoli Kendrick & Snyder, is a serious vascular disease of common bean (Phaseolus vugaris L.) in Latin America, in Africa and in the northwestern United States (Buruchara & Camacho, 2000). In Brazil, this disease has attracted special interest in the last years, due to a higher degree of mechanization in the fields, successive plantings and more than one common bean harvest per year.…”

Genetic control of the angular leaf spot reaction in common bean leaves and pods

“…Otherwise, Mahuku et al (2002) described the resistance of line México 54 to pathotype 31-55 as a single gene with the resistance due the recessive allele, when crossed with a snap bean cultivar. Another fact that stands out is the continuous response to phenotypic recurrent selection for resistance to the angular leaf spot (Amaro et al, 2007). In the genetic control of resistance to the angular leaf spot minor genes could be involved that were environmental influenced, in addition to major genes or modifier genes.…”