Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/200077
Type: Artigo de periódico
Title: Mapping Of Angular Leaf Spot Resistance Qtl In Common Bean (phaseolus Vulgaris L.) Under Different Environments.
Author: Oblessuc, Paula Rodrigues
Baroni, Renata Moro
Garcia, Antonio Augusto Franco
Chioratto, Alisson Fernando
Carbonell, Sérgio Augusto Morais
Camargo, Luis Eduardo Aranha
Benchimol, Luciana Lasry
Abstract: Common bean (Phaseolus vulgaris L.) is the most important grain legume for human diet worldwide and the angular leaf spot (ALS) is one of the most devastating diseases of this crop, leading to yield losses as high as 80%. In an attempt to breed resistant cultivars, it is important to first understand the inheritance mode of resistance and to develop tools that could be used in assisted breeding. Therefore, the aim of this study was to identify quantitative trait loci (QTL) controlling resistance to ALS under natural infection conditions in the field and under inoculated conditions in the greenhouse. QTL analyses were made using phenotypic data from 346 recombinant inbreed lines from the IAC-UNAxCAL 143 cross, gathered in three experiments, two of which were conducted in the field in different seasons and one in the greenhouse. Joint composite interval mapping analysis of QTLxenvironment interaction was performed. In all, seven QTLs were mapped on five linkage groups. Most of them, with the exception of two, were significant in all experiments. Among these, ALS10.1DG,UC presented major effects (R2 between 16%-22%). This QTL was found linked to the GATS11b marker of linkage group B10, which was consistently amplified across a set of common bean lines and was associated with the resistance. Four new QTLs were identified. Between them the ALS5.2 showed an important effect (9.4%) under inoculated conditions in the greenhouse. ALS4.2 was another major QTL, under natural infection in the field, explaining 10.8% of the variability for resistance reaction. The other QTLs showed minor effects on resistance. The results indicated a quantitative inheritance pattern of ALS resistance in the common bean line CAL 143. QTL x environment interactions were observed. Moreover, the major QTL identified on linkage group B10 could be important for bean breeding, as it was stable in all the environments. Thereby, the GATS11b marker is a potential tool for marker assisted selection for ALS resistance.
Subject: Chromosome Mapping
Crosses, Genetic
Disease Resistance
Gene-environment Interaction
Genetic Linkage
Phaseolus
Plant Diseases
Plant Leaves
Quantitative Trait Loci
Rights: aberto
Identifier DOI: 10.1186/1471-2156-13-50
Address: http://www.ncbi.nlm.nih.gov/pubmed/22738188
Date Issue: 2012
Appears in Collections:Artigos e Materiais de Revistas Científicas - Unicamp

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