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| Author(s): |
Paula Rodrigues Oblessuc
Total Authors: 1
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| Document type: | Master's Dissertation |
| Press: | Campinas, SP. |
| Institution: | Universidade Estadual de Campinas (UNICAMP). Instituto de Biologia |
| Defense date: | 2009-02-27 |
| Examining board members: |
Luciana Lasry Benchimol Reis;
Monalisa Sampaio Carneiro;
Marcos Antonio Machado
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| Advisor: | Anete Pereira de Souza; Luciana Lasry Benchimol Reis |
| Abstract | |
Common bean (Phaseolus vulgaris L.) is the most consuming legume worldwide. Common bean breeding is seeking alternatives to transfer resistance genes to cultivars of interest. The angular leaf spot disease caused by the fungus Pseudocercospora griseola (Sacc.) Crous & U. Braun is responsible for great losses for common bean producers. A new genetic map for common bean using microsatellites was obtained from a segregating population of 380 endogamic lines. This population was generated from the 'IAC-UNA' (Mesoamerican/ susceptible) x 'CAL 143' (Andean/resistant) cross. The UC map was generated with 198 microsatellites assigned to eleven linkage groups, using a minimum LOD of 3.0 and a maximum recombinant ratio of 0.40. Total map length found was 1864.2 cM. The angular leaf spot resistance phenotypic data from UC lines was obtained under natural infection condition with P. griseola, on the field, and with controlling greenhouse conditions (race 60.54). Eleven QTLs (Quantitative Trait Loci) were mapped for angular leaf spot resistance using compositive interval mapping. Seven QTLs were identified from field condition and other four QTLs, obtained from greenhouse data. The QTL effects were quantified. Total phenotypic variance explained was 34% on field experiment, in which the major QTL involved on phenotype was identified (9.1%). On the greenhouse experiment it was possible to explain 18% of total phenotypic variance, with the second major QTL, being of 7.2%. The results obtained in this work indicate a polygenic inheritance for angular leaf spot resistance, and it is necessary to carry out new phenotypic experiments with repetitions in order to reduce the environmental effects and, thus, better isolate the genetic effects. (AU) | |