Potencial genético de germoplasma elite de feijão carioca para resistência ao mofo-branco
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2019-05-07
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Universidade Federal de Goiás
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The common bean (Phaseolus vulgaris L.) represents an important source of protein and fiber on human nutrition and Brazil stands out on the production and consumption of this leguminous, especially those of the carioca market class. The incidence of white mold, one
of the most destructive diseases of bean, is among the factors responsible for the reduction of the productivity and the increasing of the production costs, meanly in winter irrigated crops, in which the microclimatic conditions such as mild temperatures and high humidity contribute for a higher proliferation of the disease. There are few cultivars or Brazilian
bean elite lines that have partial resistance to the white mold, thus, the objectives of this paper are: (i) to characterize cultivars and elite lines of the carioca bean regarding the reaction to the white mold on the field and in a controlled environment aiming to select resistance sources and (ii) to estimate genetical parameters and number of genes
controlling the character for resistance to white mold in a controlled environment utilizing the RILs K-407 × BRS Cometa population. During the characterization of the cultivars and elite lines the field trials were held in Goianira (GO), and Oratorios (MG), and in
controlled environment it was utilized the modified straw test. A 1 to 9 visual score scale was utilized for the evaluation of the trials. The data were subjected to statistical analysis utilizing mixed models through REML / BLUP and the best genotypes were selected by
their selection coincidence coefficient. Accordingly to the results the elite lineages selected as resistant both in the field and controlled environment were CNFC 16820, CNFC 15875, CNFC 15859 and CNFC 15458, in addition to the cultivars BRS Notável and BRS
Sublime. These genotypes could be indicated for growing or as parents with partial resistance to white mold in genetic breeding programs. During the white mold resistance parameters estimation study for the population of RILs BRS Cometa × K-407, 140 RILs on the F9:10 generation were artificially inoculated through the modified straw test and the disease severity was evaluated through a 1 to 9 score scale. It was employed a mixed models methodology to analyze the data. The heritability in the broad sense was moderate (0.60), the calculation of the number of genes indicated the presence of two loci of greater effect controlling the character and the relative coefficient of variation was superior to 1, indicating good experimental precision and favorable situation for the selection.
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SILVA, L. I. M. Potencial genético de germoplasma elite de feijão carioca para resistência ao mofo-branco. 2019. 65 f. Dissertação (Mestrado em Genética e Melhoramento de Plantas) - Universidade Federal de Goiás, Goiânia, 2019.