Agressividade diferencial de espécies do complexo Fusarium graminearum em interação com o fungicida tebuconazole na redução do rendimento de trigo

Spolti, Piérri; Ponte, Emerson Medeiros de Agronomia Departamento de Fitossanidade Del Faculdade

doi:10.1590/s0103-84782013000900006

Cited by 7 publications

(11 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A recent study comparing 15-ADON and NIV strains of F. graminearum from China showed that the former grew faster at both 20 oC and 25 oC, produced higher amount of perithecia, and were more aggressive towards a wheat cultivar (Liu et al 2017). These findings of enhanced aggressiveness of the 15-ADON agree with studies in Brazil, although the NIV strains were of a different species ( F. meridionale ) (Spolti et al 2012a; Spolti et al 2013). The toxigenic potential of F. graminearum also appeared to be higher than F. meridionale because much greater amount of DON was produced compared to NIV produced by the latter (Nicolli et al 2015).…”

Section: Introductionsupporting

confidence: 89%

“…Differences in macroconidia production in culture among species may be suggestive of advantages for further spread by assexual means (Leplat et al 2013). We found that the variation in this trait was very large among isolates of the same species, especially F. graminearum and F. meridionale , the most represented species, which prevented us from detecting differences as found in our previous studies using a different set of isolates and smaller sample (Spolti et al 2012a; Spolti & Del Ponte 2013). Recently, Liu et al (2017) reported significantly greater macroconidia production by 20 F. graminearum 15-ADON strains than 20 F. asiaticum NIV strains, but they both did not differ from the F. asiaticum 3-ADON strains.…”

Section: Discussionmentioning

confidence: 54%

See 1 more Smart Citation

Fitness traits of deoxynivalenol and nivalenol-producing Fusarium graminearum species complex strains from wheat

Nicolli

Machado

Spolti

et al. 2017

Preprint

View full text Add to dashboard Cite

Fusarium graminearum of the 15-acetyl(A)deoxynivalenol(D0N) chemotype is the main cause of Fusarium head blight (FHB) of wheat in south of Brazil. However, 3-ADON and nivalenol(NIV) chemotypes have been found in other members of the species complex causing FHB in wheat. To improve our understanding of the pathogen ecology, we assessed a range of fitness-related traits in a sample of 30 strains representatives of 15-ADON (F. graminearum), 3-ADON (F. cortaderiae and F. austroamericanum) and NIV (F. meridionale and F. cortaderiae). These included: perithecia formation on three cereal-based substrates, mycelial growth at two suboptimal temperatures, sporulation and germination, pathogenicity towards a susceptible and a moderately resistant cultivar and sensitivity to tebuconazole. The most important trait favoring F. graminearum was its 2x higher sexual fertility (> 40% PPI = perithecia production index) than the other species (< 30% PPI); PPI varied among substrates (maize > rice > wheat). In addition, sensitivity to tebuconazole appeared lower in F. graminearum which had the only strain with EC50 > 1 ppm. In the pathogenicity assays, the DON-producers were generally more aggressive (1.5 to 2x higher final severity) towards the two cultivars, with 3-ADON or 15-ADON leading to higher area under the severity curve than the NIV strains in the susceptible and moderately resistant cv., respectively. There was significant variation among strains of a same species with regards asexual fertility (mycelial growth, macroconidia production and germination), which suggest a strain-rather than a species-specific differences. These results contribute new knowledge to improve our understanding of the pathogen-related traits that may explain the dominance of certain members of the species complex in specific wheat agroecosystems.

show abstract

Section: Introductionsupporting

confidence: 89%

Section: Discussionmentioning

confidence: 54%

Fitness traits of deoxynivalenol and nivalenol-producing Fusarium graminearum species complex strains from wheat

Nicolli

Machado

Spolti

et al. 2017

Preprint

View full text Add to dashboard Cite

show abstract

“…In previous studies, saprophytic (asexual growth) and pathogenic fitness traits of Brazilian isolates of F. graminearum (15-ADON) and F. meridionale (NIV) have been compared, with some fitness advantages being attributed to the former (Spolti et al 2012;Spolti and Del Ponte 2013). It is not well understood whether the Brazilian isolates of the DON and NIV genotypes produce only the respective main trichothecene form during pathogenesis.…”

Section: Introductionmentioning

confidence: 99%

Fusarium head blight and trichothecene production in wheat by Fusarium graminearum and F. meridionale applied alone or in mixture at post-flowering

Nicolli

Spolti

Tibola

et al. 2015

Trop. plant pathol.

View full text Add to dashboard Cite

A greenhouse study was conducted to expand our knowledge of the disease and mycotoxin production by Fusarium graminearum (Fgra) and F. meridionale (Fmer) inoculated at post-flowering, either alone or in equal mixture, into three cultivars varying in their reaction to Fusarium head blight (FHB) in the field. In the first experiment, the entire spike was spray-inoculated and the proportion of diseased spikes (or incidence, INC) was monitored up to 15 days after inoculation (dai). In the second experiment, the inoculum was dispensed into the central-spikelet and the proportion of disease spikelets (or severity, SEV) was evaluated at 15 dai. The inoculum composition and the inoculum x cultivar interaction on both experiments were not significant. However, BRS 194, a standard for susceptibility, had significantly higher INC and SEV than BRS Parrudo and BRS 179, the latter a standard for moderate resistance. Fmer was less damaging to grain yield than Fgra and grain yield of BRS Parrudo was the least affected among the cultivars. Trichothecenes (DON + NIV) were detected in both experiments, irrespectively of the cultivar, at levels up to 2,000 and 15,000 μg/kg, in the spray-inoculation and central-spikelet inoculation experiment, respectively. Fgra alone produced only DON and Fgra+Fmer produced mainly DON and small amount of NIV. Fmer produced mainly NIV, but also trace amounts of DON. Our results suggest that post-flowering infections may contribute with trichothecenes in mature grain, especially DON. Nevertheless, NIV should be considered in analytical surveys due to its high toxicity.

show abstract

“…The fungicidal effect of C 16 MImCl occurred within the first hour of exposure, which is an advantage over tebuconazole, for example, which exhibit a fungistatic effect (Yin et al 2009). In fact, a temporary suppression of FHB severity progress has been reported for tebuconazole-treated wheat plants (Becher et al 2010;Spolti and Del Ponte 2013).…”

Section: Discussionmentioning

confidence: 97%

“…In fact, a temporary suppression of FHB severity progress has been reported for tebuconazole‐treated wheat plants (Becher et al . ; Spolti and Del Ponte ).…”

Section: Discussionmentioning

confidence: 98%

Imidazolium salts with antifungal potential for the control of head blight of wheat caused by Fusarium graminearum

et al. 2016

View full text Add to dashboard Cite

show abstract

Agressividade diferencial de espécies do complexo Fusarium graminearum em interação com o fungicida tebuconazole na redução do rendimento de trigo

Cited by 7 publications

References 19 publications

Fitness traits of deoxynivalenol and nivalenol-producing Fusarium graminearum species complex strains from wheat

Fitness traits of deoxynivalenol and nivalenol-producing Fusarium graminearum species complex strains from wheat

Fusarium head blight and trichothecene production in wheat by Fusarium graminearum and F. meridionale applied alone or in mixture at post-flowering

Imidazolium salts with antifungal potential for the control of head blight of wheat caused by Fusarium graminearum

Contact Info

Product

Resources

About