Fontes de resistência à murcha-de-curtobacterium em cultivares locais de feijoeiro, coletadas em Santa Catarina

Abstract

RESUMOAvaliou-se a reação de 73 cultivares locais de feijoeiro, coletadas em Santa Catarina, à murcha-de-curtobacterium, causada por Curtobacterium flaccumfaciens pv. flaccumfaciens. Os experimentos foram instalados em condições de casa-de-vegetação e as cultivares IAC Carioca Pyatã e IPR 88 -Uirapuru foram os padrões resistente e suscetível, respectivamente. Aos 10 dias após a emergência, houve a inoculação das plantas com o isolado FJ 36 e as avaliações dos sintomas ocorreram aos 10, 14, 21 e 28 dias após a inoculação. Foi possível identificar as cv. locais Mouro Piratuba (grupo de coloração variada) e Vagem Amarela (grupo preto) como fontes de resistência à murcha-de-curtobacterium. Termos para indexação:Phaseolus vulgaris, resistência genética, controle, Curtobacterium flaccumfaciens pv. flaccumfaciens. ABSTRACTIt was evaluated the reaction of 73 common bean land races, collected in Santa Catarina State, to the bacterial wilt, caused by Curtobacterium flaccumfaciens pv. flaccumfaciens. The experiments were set up under greenhouse conditions and the cultivars IAC Carioca Pyatã and IPR 88 Uirapuru were the resistant and susceptible standards, respectively. The inoculation with the strain FJ 36 was done in the 10 th day after the sowing and the disease evaluations were at the 10, 14, 21 and 28 th day after the inoculation. The landraces Mouro Piratuba (color bean group) and Vagem Amarela (black bean group) were identified as resistance sources of bacterial wilt of bean.

Reaction of common bean lines to Xanthomonas axonopodis pv. phaseoli and Curtobacterium flaccumfaciens pv. Flaccumfaciens

“…Parent IPR-Uirapuru was classified as susceptible to C. flaccumfaciens pv. flaccumfaciens by Theodoro et al (2007) and Maringoni et al (2015).…”

“…According to Valentini et al (2011), the resistance inheritance of this pathogen is polygenic and, according to Souza et al (2006b), Wendland et al (2008), and Torres et al (2009b), the occurrence of genetic diversity and widespread dissemination in the producing regions of Brazil, makes the development of resistance sources even more difficult. For this reason, techniques have been developed to identify this bacterium in common bean crops (Maringoni 2002, Hsieh et al 2005, Herbes et al 2008, as well as to evaluate the resistance of genotypes and lines, with a view to the development of new resistant cultivars (Maringoni 2002, Souza et al 2006a, Theodoro et al 2007). …”

Differential interactions between Curtobacterium flaccumfaciens pv. flaccumfaciens and common bean

“…In 1995, this disease was reported in the State of São Paulo, Brazil, during the raining season (Maringoni and Rosa, 1997). Bacterial wilt can also be found in several additional Brazilian states, such as Santa Catarina, Goiás, and the Federal District (Uesugi et al, 2003;Theodoro et al, 2007).…”

Sources of resistance to Curtobacterium flaccumfaciens pv. flaccumfaciens in common bean accessions

“…To meet the need for resistant genotypes, the identification of bean genotypes with good resistance levels is essential for the development of a breeding program, facilitating the incorporation of resistance genes into highyielding, susceptible genotypes (Maringoni 2002, Souza et al 2006, Theodoro et al 2007, Krause et al 2009). For this purpose, the collections in the living genebanks contain a huge variability of genes, which must be characterized for the use in breeding programs.…”