Fusarium species from tropical grasses in Brazil and description of two new taxa

Costa, Marileide Moreira; Melo, Maruzanete Pereira de; Carmo, Filipe Sandin do; Moreira, Guilherme Musse; Guimarães, E. A.; Rocha, Fernando da Silva; Costa, S. S.; Abreu, Lucas M.; Pfenning, Ludwig H.

doi:10.1007/s11557-020-01658-5

Cited by 12 publications

(8 citation statements)

References 39 publications

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“…Purss [56] found perithecia and sporodochia on senesced grasses collected in spring and therefore assumes that phytopathogenic fungi may also use wild grasses residues as noncrop hosts to overwinter. Costa et al [57] noted that over the last years, "the interest in investigating Fusarium species associated with asymptomatic native or introduced plants has increased". However, little is known about the importance of weeds in the Fusarium head blight disease cycle [21,[58][59][60].…”

Section: Discussionmentioning

confidence: 99%

Arable Weeds at the Edges of Kettle Holes as Overwintering Habitat for Phytopathogenic Fungi

et al. 2022

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Weeds in agricultural landscapes can serve as alternate hosts for phytopathogenic fungi and promote the spatial and long-term distribution of these fungi. Especially, semi-natural habitats such as kettle holes are considered as a source of fungal pathogens because they are a permanent habitat for various weed species in arable lands. In our study, we investigated the suitability of nine different weed species and families at the edges of 18 kettle holes in two consecutive autumn/winter seasons as alternate hosts for Fusarium and Alternaria. We detected a fungal infestation with both genera on every weed species investigated with significantly higher abundances of these fungi in the second, notably wetter season. Eight weed species were described as non-host plants for Fusarium and Alternaria in agricultural landscapes in Brandenburg, Germany for the first time. In both autumn/winter periods, weeds harbored more Alternaria than Fusarium. The study revealed a high Fusarium species diversity in weeds and a community structure of up to 12 Fusarium species at the edges of kettle holes. Grasses showed the highest diversity and often the highest fungal abundances compared to herbaceous plants. Therefore, these habitats in arable lands can act as ecosystem disservice and promote the spread of fungal diseases in the surrounding crop fields.

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Section: Discussionmentioning

confidence: 99%

Arable Weeds at the Edges of Kettle Holes as Overwintering Habitat for Phytopathogenic Fungi

et al. 2022

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“…was recently reported in Brazil. Eleven species of Fusarium associated with wild grass seeds were identified, five of which belong to the FFSC (Costa, Melo, et al, 2021). Although F. sacchari was not identified, this species is likely transmitted by grass seeds in Brazil based on similar reports in other countries (Petrovic et al, 2013).…”

Section: Discussionmentioning

confidence: 99%

“…was recently reported in Brazil. Eleven species of Fusarium associated with wild grass seeds were identified, five of which belong to the FFSC (Costa, Melo, et al, 2021). Although F.…”

Section: Ta B L Ementioning

confidence: 99%

“…Although pokkah boeng is an important disease in sugarcane growing areas in southeastern Brazil (Costa et al, 2019; Costa, Melo, et al, 2021), this disease has been neglected because its symptoms are confused with that of boron mineral deficiency (Rice et al, 2006). The spread of the aetiological agent occurs through propagating material, since most sugarcane varieties are carriers of the pathogen; however, the plants do not show symptoms, which allows the pathogen to spread through propagating material (Tokeshi & Rago, 2005).…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Identification and genetic diversity ofFusarium sacchariassociated with pokkah boeng disease of sugarcane in Northeast Brazil

Carvalho

Rocha

Melo

et al. 2022

Journal of Phytopathology

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Isolates from the Fusarium fujikuroi species complex, mainly F. sacchari, have been reported to be the causal agents of pokkah boeng in sugarcane in Brazil. However, inadequate information was available on the occurrence and genetic diversity of F. sacchari in Northeast Brazil, which is a limiting factor on management. Thus, isolates of F. subglutinans sensu lato from sugarcane plants with symptoms of pokkah boeng were evaluated using the sexual cross-fertility to determine species. All the isolates produced black perithecia when they were crossed with the test isolates of F. sacchari.Three weeks after the crossing, the formation of fertile ascospores cirri was observed.Thirty-four isolates were self-sterile hermaphrodites, while 21 were fertile only as males. Five isolates were homothallic. The effective size [N e(f) ] of the population as a function of the frequency of hermaphrodites and female sterile strains was 95.5%.The F. sacchari isolates were separated into four genetic groups independent of geographic location. The mean of polymorphism among all populations was 79%, and the average unbiased genetic diversity (uh) was considered moderate (0.31). This study in addition to confirming that F. sacchari as the main species associated with pokkah boeng in sugarcane in Northeast Brazil, reveals the relationship of mating type and genetic diversity of F. sacchari. The unrestricted gene flow between regions is probably the best explanation for the low geographic correlation. This knowledge will help in the adoption of management measures with fungicides or resistant cultivars.

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Seed-borne diseases in pasture grasses and legumes: state of the art and gaps in knowledge

2022

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Fusarium species from tropical grasses in Brazil and description of two new taxa

Cited by 12 publications

References 39 publications

Arable Weeds at the Edges of Kettle Holes as Overwintering Habitat for Phytopathogenic Fungi

Arable Weeds at the Edges of Kettle Holes as Overwintering Habitat for Phytopathogenic Fungi

Identification and genetic diversity ofFusarium sacchariassociated with pokkah boeng disease of sugarcane in Northeast Brazil

Seed-borne diseases in pasture grasses and legumes: state of the art and gaps in knowledge

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