Efeito Do Silício Na Intensidade Da Cercosporiose E Na Nutrição Mineral De Mudas De Cafeeiro

Botelho, D. M. S.; Pozza, Edson Ampélio; Alves, Eduardo; Botelho, César Elias; Pozza, Adélia Aziz Alexandre; Souza, Paulo Estevão de

doi:10.1590/1808-1657v78p0232011

Cited by 4 publications

(3 citation statements)

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“…In this study, no significant differences were observed among the inoculated and non-inoculated genotypes of coffee plants with C. coffeicola regarding total soluble phenolic compounds and soluble lignin levels. Similar results have been reported elsewhere on this pathosystem [25,26]. Since phenolic compounds and lignin are produced as a physical and chemical defense mechanism against pathogen attacks [27,28,29], it was expected that the inoculated genotypes would present higher levels of these metabolites as compared to non-inoculated ones.…”

Section: Vastatrixsupporting

confidence: 86%

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Screening coffee genotypes for Cercospora coffeicola resistance in Brazil

Ramos

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Botelho

et al. 2021

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Several efforts have been made by many researchers worldwide to develop coffee plants resistant to different Cercospora species; however, studies concerning C. coffeicola , specifically, are still incipient. In the present study, a blend of strains from this pathogen was inoculated into 18 Brazilian commercial cultivars, a coffee clone of Arabica, as well as into 41 accessions from the Germplasm Collection of Minas Gerais, to evaluate the genetic resistance ability within the population and select superior genotypes for the breeding program. After predicting genotypic values of the evaluated material, the most efficient way to select genotypes based on the data of severity to brown eye spot (BES) was also examined. Moreover, the action of defense mechanisms against C. coffeicola attacks was investigated by assessing the levels of total soluble phenolic compounds and soluble lignin in contrasting genotypes regarding disease susceptibility. Based on the results, the accession MG 1207 Sumatra demonstrated an intrinsic genetic capacity to maintain low levels of severity to brown eye spot. This genotype can thus substantially contribute to the development of new cultivars, which may lead to reduced use of pesticides. This study also evidenced that four evaluations of severity is enough to reach accuracy and efficiency for the severity of BES, thus providing expressive genetic gains. Finally, it is suggested that the levels of lignin and phenolic compounds are not associated with the resistance of coffee genotypes to brown eye spot.

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Section: Vastatrixsupporting

confidence: 86%

“…elsewhere on this pathosystem [25,26]. Since phenolic compounds and lignin are produced as a physical and chemical defense mechanism against pathogen attacks [27,28,29], it was expected that the inoculated genotypes would present higher levels of these metabolites as compared to non-inoculated ones.…”

Section: Vastatrixmentioning

confidence: 99%

Screening coffee genotypes for Cercospora coffeicola resistance in Brazil

Ramos

Resende

Botelho

et al. 2021

Preprint

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“…Furthermore, cultivars with less robust symbiosis traits often require higher levels of fertilisation. For example the coffee cultivar Caturra supports mycorrhizal fungi with reduced hyphal length compared to other cultivars and has an unusually high requirement for fertilisation (Abruña et al, 1969;Botelho et al, 2011;Lebrón et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Impacts of domestication on the rhizobial mutualism of five legumes across a gradient of nitrogen-fertilisation

2023

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AimsDomestication has improved plant traits to facilitate human use, but can have unintended consequences for traits that are not the target of selection. Disruption in the mycorrhizal mutualism has already been observed in domesticated plants, but little is known about whether the legume-rhizobia mutualism can be similarly disrupted, despite the ecological importance of symbiotic nitrogen xation. We aim to identify differences in the outcome of this mutualism between wild and domesticated legumes, in terms of reaction norms across varying nitrogen levels. MethodsIn a series of greenhouse experiments, we characterise rhizobial symbiosis traits in chickpeas, lentils, peas, peanuts, and soybeans across six levels of nitrogen fertilisation to characterise whether and how symbiosis traits differ across continuous variation in soil conditions for wild and domesticated lineages. ResultsOur reaction norm characterisations reveal that at lower levels of nitrogen fertilisation, wild soybeans receive a greater bene t from rhizobia than do domesticated soybeans. Additionally, domesticated chickpeas abandon symbiosis at a lower level of nitrogen fertilizer than do wild chickpeas. However, other crops we tested express symbiosis trait reaction norms that are indistinguishable from those of their wild relatives. ConclusionsDifferences are evident between the mutualism reaction norms of domesticated and wild chickpea and soybean, but not lentil, pea, or peanut. This indicates that mutualism disruption is a possible, but not necessary, consequence of domestication.

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