Aggressiveness of Pseudocercospora griseola strains in common bean genotypes and implications for genetic improvement

Pereira, Rucyan Walace; Souza, Elaine Aparecida de; Barcelos, Q.L.; Abreu, A. F. B.; Librelon, Samira Santiago

doi:10.4238/2015.may.12.7

Cited by 27 publications

(32 citation statements)

References 24 publications

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“…Therefore, for the proposed scale to reproduce results similar to those obtained by the Van Schoonhoven and Pastor Corrales (1987) scale, it was necessary to increase the levels of symptoms represented at each grade of the scale. This is important because the resistance in the P. griseola/ common bean pathosystem is mainly horizontal (Pereira et al 2015) and resistant genotypes could be eliminated in early evaluations without adjustment in scale.…”

Section: Discussionmentioning

confidence: 99%

Diagrammatic scale to evaluate angular leaf spot severity in primary leaves of common bean

Librelon

Souza

Pereira

et al. 2015

Australasian Plant Pathol.

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The aim of this study was to develop a diagrammatic scale to evaluate angular leaf spot (ALS) severity in primary leaves of common bean. A diagrammatic scale was developed and validated with nine levels of severity: 0 %; 0.1 to 0.5 %; 0.6 to 4.0 %; 4.1 to 7.0 %; 7.1 to 16 %; 16.1 to 26 %; 26.1 to 32 %; 32.1 to 38 % and 38.1 to 60 %. The use of this scale, associated with the early inoculation method, allowed rating of ALS severity in common bean leaves in the V2 stage of development that is, when the primary leaves are fully open. Validation of the scale was performed by 14 Evaluators. These Evaluators estimated the severity in 40 common bean leaves with different levels of severity, previously measured by the software Quant®. The accuracy and precision of each Evaluator were determined by simple linear regression, by comparing between actual severity, measured electronically, and that estimated by the Evaluator. Without the scale, most of the Evaluators overestimated the severity of the disease. With the scale, the Evaluators obtained better levels of accuracy and precision, with absolute errors less than 5 %. The diagrammatic scale proposed proved to be adequate for early performance of the pathogenicity test.

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Section: Discussionmentioning

confidence: 99%

Diagrammatic scale to evaluate angular leaf spot severity in primary leaves of common bean

Librelon

Souza

Pereira

et al. 2015

Australasian Plant Pathol.

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“…, refs in Christie and Shattuck 1992; Lenarcic et al 2012; Okoro and Mbajiorgu 2017), including host-pathogen interactions in, e.g. , crickets (Rantala and Roff 2006), flies (Wayne et al 2011), and insects (Pereira et al 2015) (see Methods and Discussion for connections to other diallel literature).…”

Section: Introductionmentioning

confidence: 99%

Diallel analysis revealsMx1-dependent andMx1-independent effects on response to influenza A virus in mice

Maurizio

Ferris

Keele

et al. 2017

Preprint

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Influenza A virus (IAV) is a respiratory pathogen that causes substantial morbidity and mortality during both seasonal and pandemic 1 outbreaks. Infection outcomes in unexposed populations are affected by host genetics, but this host genetic architecture is not well 2 understood. Here we obtain a broad view of how heritable factors affect a mouse model of response to IAV infection using an 8×8 diallel 3 of the eight inbred founder strains of the Collaborative Cross (CC). Expanding on a prior statistical framework for modeling treatment 4 response in diallels, we explore how a range of heritable effects modify acute host response to IAV through 4 days post-infection. Heritable 5 effects in aggregate explained about 57% of the variance in IAV-induced weight loss. Much of this was attributable to a pattern of additive 6 effects that became more prominent through day 4 post-infection and was consistent with previous reports of anti-influenza myxovirus 7 resistance 1 (Mx1) polymorphisms segregating between these strains; the additive effects largely recapitulated haplotype effects observed 8 at the Mx1 locus in a previous study of the incipient CC (pre-CC), and are also replicated here in a CC recombinant intercross (CC-RIX) 9 population. Genetic dominance of protective Mx1 haplotypes was observed to differ by subspecies origin: relative to the domesticus null 10 Mx1 allele, musculus acts dominantly whereas castaneus acts additively. After controlling for Mx1, heritable effects, though less distinct, 11 accounted for about 34% of the phenotypic variance. Implications for future mapping studies are discussed. 12Keywords: treatment response, multiparental population, causal effect, Bayesian model, multiple imputation ARTICLE SUMMARY 14Seasonal and pandemic influenza viruses comprise an important public health burden, but the architecture of host genetic resistance to 15 viruses is poorly understood. We conducted an influenza challenge in a diallel cross of eight inbred mouse strains. Roughly 60% of variation 16 in disease at 4 days post-infection was explained by genetic and non-genetic diallel effects, with about 34% of variation independent of the 17 host resistance factor, Mx1. The dominance of Mx1 resistance was highly dependent on subspecies Mx1 allelic origin, and similar Mx1 18 effect patterns were found in the related Collaborative Cross strains, motivating integrated infection studies in these populations.

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“…It was verified that the pathosystem common bean– P . griseola presents vertical and horizontal resistance [83]. These authors also observed that the recurrent selection has provide accumulate both types of resistance.…”

Section: Discussionmentioning

confidence: 99%

Are duplicated genes responsible for anthracnose resistance in common bean?

et al. 2017

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The race 65 of Colletotrichum lindemuthianum, etiologic agent of anthracnose in common bean, is distributed worldwide, having great importance in breeding programs for anthracnose resistance. Several resistance alleles have been identified promoting resistance to this race. However, the variability that has been detected within race has made it difficult to obtain cultivars with durable resistance, because cultivars may have different reactions to each strain of race 65. Thus, this work aimed at studying the resistance inheritance of common bean lines to different strains of C. lindemuthianum, race 65. We used six C. lindemuthianum strains previously characterized as belonging to the race 65 through the international set of differential cultivars of anthracnose and nine commercial cultivars, adapted to the Brazilian growing conditions and with potential ability to discriminate the variability within this race. To obtain information on the resistance inheritance related to nine commercial cultivars to six strains of race 65, these cultivars were crossed two by two in all possible combinations, resulting in 36 hybrids. Segregation in the F2 generations revealed that the resistance to each strain is conditioned by two independent genes with the same function, suggesting that they are duplicated genes, where the dominant allele promotes resistance. These results indicate that the specificity between host resistance genes and pathogen avirulence genes is not limited to races, it also occurs within strains of the same race. Further research may be carried out in order to establish if the alleles identified in these cultivars are different from those described in the literature.

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Aggressiveness of Pseudocercospora griseola strains in common bean genotypes and implications for genetic improvement

Cited by 27 publications

References 24 publications

Diagrammatic scale to evaluate angular leaf spot severity in primary leaves of common bean

Diagrammatic scale to evaluate angular leaf spot severity in primary leaves of common bean

Diallel analysis revealsMx1-dependent andMx1-independent effects on response to influenza A virus in mice

Are duplicated genes responsible for anthracnose resistance in common bean?

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