Reaction and colonization of common bean genotypes by Curtobacterium flaccumfaciens pv. Flaccumfaciens

Abstract

Reaction and colonization of common bean genotypes by INTRODUCTIONBrazil is one of the world's leading common bean producers and consumers, with a harvest of almost three million tons in 2012, in the main producing states of Paraná, Minas Gerais, São Paulo and Goiás (Agrianual 2013). Bacterial diseases are among the yield-limiting factors of the crop in the country, particularly bacterial wilt. This disease is caused by Curtobacterium flaccumfaciens pv. flaccumfaciens (Cff), and was first described by Hedges (1922) in the USA. Currently, the disease has already been detected in several countries (EPPO 2011) and Brazilian states (Valentini et al. 2010). Bacterial wilt colonizes the xylem vessels of the affected plants, leading to disruption and degradation of the primary xylem. Infected plants show symptoms of wilting leaves, which later evolve to withering and death (Dinesen 1978). Yield losses in susceptible cultivars can be close to 50% (Miranda Filho 2006). Bacterial wilt is controlled by preventive measures, e.g., by using healthy seeds, incorporation of crop bean residues into the soil, crop rotation with non-host species, and by using cultivars with some level of resistance (Huang et al. 2009, Valentini et al. 2010.A number of studies identified Cff-resistant common bean genotypes in Brazil. According to Maringoni (2002), high resistance levels were observed in the cultivars IAC Carioca Akytã, IAC Carioca Aruã, and IAC Carioca Pyatã. Souza et al. (2006) Carioca Aruã, IAC Carioca Pyatã, and IAC Carioca Tybatã, whose resistance reactions were found to be as described by Maringoni (2002) and Souza et al. (2006).

Bacterial wilt of dry beans caused by Curtobacterium flaccumfaciens pv. flaccumfaciens: A new threat from an old enemy

“…Greenhouse experiments provided promising results confirming the source of resistance against different strains of bacterial wilt and common bacterial blight pathogens in Iran (Osdaghi et al , ; Osdaghi and Lak, ). In Brazil under greenhouse conditions, resistance to bacterial wilt was observed in dry bean cultivars IAC Diplomata, IAC Alvorada, IAC Imperador, IAC Carioca Tybatã, IAC Carioca Pyatã, IPR Corujinha, and IPR Tangará, and in the lines P5‐4‐4‐1 and C4‐5‐4‐1‐2 (Maringoni et al , ).…”

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

“…IAC Diplomata and IAC Alvorada were classified as resistant, while IAC Una was classified as susceptible by Maringoni et al (2015). Parent IPR-Uirapuru was classified as susceptible to C. flaccumfaciens pv.…”

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

“…Rava et al (2003), Souza et al (2006a), Theodoro and Maringoni (2006), Costa et al (2008), Silva et al (2009), andMaringoni et al (2015). These authors emphasized the importance of obtaining resistance sources to both bacterial diseases.…”

Ação in vitro de fontes de silício sobre isolados de Curtobacterium flaccumfaciens pv. flaccumfaciens

“…Esta doença é causada pela bactéria Curtobacterium flaccumfaciens pv. flaccumfaciens (Cff) e causa os sintomas de escurecimento vascular, murcha, amarelecimento de folhas, subdesenvolvimento e morte das plantas (26); em decorrência do patógeno colonizar os vasos do xilema e obstruir a passagem de seiva (16). Após a morte da planta a bactéria pode permanecer nos restos de cultura, quando mantidos na superfície do solo, tornando-se uma importante fonte de inóculo (22).…”