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      Desempenho de familias do cruzamento entre linhagens de feijões andinos e mesoamericanos em produtividade e resistência a Phaeoisariopsis griseola Translated title: Performance of common bean families from cross between of andean and mesoamerica lines on grain yield and resistance to Phaeoisariopsis griseola

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          Abstract

          No Estado de Minas Gerais, tem sido constatado que as raças fisiológicas prevalecentes de Phaeiosariopsis griseola (Sacc.) Ferr. infectam predominantemente os feijões mesoamericanos. Os feijões andinos normalmente apresentam boa resistência. A introdução de alelos de resistência de cultivares andinas em cultivares mesoamericanas é uma boa estratégia na obtenção de cultivares adaptadas e resistentes a esse patógeno. Com esse objetivo foi realizado o cruzamento entre a linhagem ESAL 550 (grupo andino e resistente à mancha angular) x Carioca-MG (grupo mesoamericano e suscetível à mancha angular). Após a avaliação das famílias segregantes nas gerações F2:3, F2:4 e F2:5, foram selecionadas linhagens que associavam bom nível de resistência à P. griseola e grãos creme com rajas marrons porém, nenhum deles em condições de ter aceitação comercial.

          Translated abstract

          In some regions of Minas Gerais State, prevalent physiological races of Phaeoisariopsis griseola (Sacc.) Ferr. infect mainly cultivars of Mesoamerican origin, but the Andean cultivars are resistant. The introduction of alleles for resistance of Andean cultivars in Mesoamerican cultivars is a good strategy to obtain adapted cultivars with resistance to this disease. With this purpose, the cross between ESAL 550 (Andean group and resistant to angular leaf spot) and Carioca-MG (Mesoamerican group and susceptible to angular leaf spot) was performed. After evaluation of the segregant families in generations F2:3, F2:4 and F2:5, some lines with high resistance to P. griseola and grain type far from market standard were identified.

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          Modeling the Physiological Growth of Swine Part I: Model Logic and Growth Concepts

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            Interações genótipos x épocas de semeadura, anos e locais na avaliação de cultivares de feijão nas Regiões Sul e Alto Paranaíba em Minas Gerais

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              Identification of Phaeoisariopsis griseola pathotypes from five States in Brazil

              Due to the increased importance of angular leaf spot of common bean (Phaseolus vulgaris) in Brazil, monitoring the pathogenic variability of its causal agent (Phaeoisariopsis griseola) is the best strategy for a breeding program aimed at developing resistant genotypes. Fifty one isolates of P. griseola collected in five Brazilian States were tested on a set of 12 international differential cultivars in the greenhouse. When inoculated plants showed symptoms but no sporulation was observed, they were transferred to a moist chamber for approximately 20-24 h. After this period of time, if no sporulation was observed, the plants were considered resistant; otherwise, they were considered susceptible. From the fifty-one tested isolates, seven different pathotypes were identified. No Andean pathotypes were identified; consequently, all isolates were classified as Middle American pathotypes. Pathotype 63-31 was the most widespread. Pathotype 63-63 overcame resistance genes present in all differential cultivars and also the resistance gene(s) present in the cultivar AND 277. This fact has important implications for breeding angular leaf spot resistance in beans, and suggests that searching for new resistance genes to angular leaf spot must be pursued.
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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Journal
                cagro
                Ciência e Agrotecnologia
                Ciênc. agrotec.
                Editora da Universidade Federal de Lavras (Lavras )
                1981-1829
                June 2007
                : 31
                : 3
                : 650-655
                Affiliations
                [1 ] Universidade Federal de Lavras Brazil
                [2 ] Universidade Federal de Lavras Brazil
                [3 ] Embrapa Arroz e Feijão Brazil
                Article
                S1413-70542007000300008
                10.1590/S1413-70542007000300008
                fbe05861-75c6-4e2b-b07d-bb78f7beae36

                http://creativecommons.org/licenses/by/4.0/

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                SciELO Brazil

                Self URI (journal page): http://www.scielo.br/scielo.php?script=sci_serial&pid=1413-7054&lng=en
                Categories
                AGRICULTURE, MULTIDISCIPLINARY

                General agriculture
                Resistance to angular leaf spot,genetics breeding,heritability,Resistência à mancha angular,melhoramento genético,herdabilidade

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