Cercospora zeina is the main species causing gray leaf spot in southern and central Brazilian maize regions

Neves, Danilo L.; Silva, Cleiltan N.; Pereira, Carolina Bertuzzi; Campos, H. D.; Tessmann, Dauri José

doi:10.1007/s40858-015-0053-5

Cited by 9 publications

(4 citation statements)

References 18 publications

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“…The fungus Cercospora zeae-maydis is the predominant causal agent in the USA and other maize-growing regions (Wang et al, 1998). The related fungal species Cercospora zeina also causes GLS, and has been recently documented in South Africa, China and Brazil (Meisel et al, 2009;Liu and Xu, 2013;Neves et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Systems genetics reveals a transcriptional network associated with susceptibility in the maize–grey leaf spot pathosystem

et al. 2017

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We used a systems genetics approach to elucidate the molecular mechanisms of the responses of maize to grey leaf spot (GLS) disease caused by Cercospora zeina, a threat to maize production globally. Expression analysis of earleaf samples in a subtropical maize recombinant inbred line population (CML444 × SC Malawi) subjected in the field to C. zeina infection allowed detection of 20 206 expression quantitative trait loci (eQTLs). Four trans-eQTL hotspots coincided with GLS disease QTLs mapped in the same field experiment. Co-expression network analysis identified three expression modules correlated with GLS disease scores. The module (GY-s) most highly correlated with susceptibility (r = 0.71; 179 genes) was enriched for the glyoxylate pathway, lipid metabolism, diterpenoid biosynthesis and responses to pathogen molecules such as chitin. The GY-s module was enriched for genes with trans-eQTLs in hotspots on chromosomes 9 and 10, which also coincided with phenotypic QTLs for susceptibility to GLS. This transcriptional network has significant overlap with the GLS susceptibility response of maize line B73, and may reflect pathogen manipulation for nutrient acquisition and/or unsuccessful defence responses, such as kauralexin production by the diterpenoid biosynthesis pathway. The co-expression module that correlated best with resistance (TQ-r; 1498 genes) was enriched for genes with trans-eQTLs in hotspots coinciding with GLS resistance QTLs on chromosome 9. Jasmonate responses were implicated in resistance to GLS through co-expression of COI1 and enrichment of genes with the Gene Ontology term 'cullin-RING ubiquitin ligase complex' in the TQ-r module. Consistent with this, JAZ repressor expression was highly correlated with the severity of GLS disease in the GY-s susceptibility network.

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Section: Introductionmentioning

confidence: 99%

Systems genetics reveals a transcriptional network associated with susceptibility in the maize–grey leaf spot pathosystem

et al. 2017

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“…CPC 12062 ) and C. sorghi var. maydis (Carson [23] Phytopathology et al 2002;Neves et al 2015) were not observed in this survey in South Africa. However, it is not clear whether these species are causal agents of GLS or saprophytes associated with GLS lesions caused by C. zeina or C. zeae-maydis.…”

Section: Discussionmentioning

confidence: 75%

Cercospora zeina from Maize in South Africa Exhibits High Genetic Diversity and Lack of Regional Population Differentiation

Müller

Barnes

Kunene³

et al. 2016

Phytopathology®

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South Africa is one of the leading maize-producing countries in sub-Saharan Africa. Since the 1980s, Cercospora zeina, a causal agent of gray leaf spot (GLS) of maize, has become endemic in South Africa, and is responsible for substantial yield reductions. To assess genetic diversity and population structure of C. zeina in South Africa, 369 isolates were collected from commercial maize farms in three provinces (KwaZulu-Natal, Mpumalanga and North West). These isolates were evaluated with fourteen microsatellite markers and species-specific mating type markers that were designed from draft genome sequences of C. zeina isolates from Africa (CMW 25467) and USA (USPA-4). Sixty alleles were identified across 14 loci, and gene diversity values within each

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“…and moderate activity against Colletotrichum graminicola. This latest, is an important fungus of maize crops [33,50,51]. However, strain…”

Section: Discussionmentioning

confidence: 99%

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2018

BRB

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Maize (Zea mays L.) culture has a great importance in several countries, especially in Brazil the third-largest world producer. The increase in maize production has been achieved with a high use of fungicide; however, in view of a more sustainable agriculture plant growth promoting bacteria have been explored aiming for the replacement of chemical fertilizers and biological control. In this study, we investigated the bacterial community isolated from maize roots in order to evaluate their capacity of growth promotion as well as of inhibition of fungal species associated with maize leaf diseases. All isolates evaluated were positive for at least one of the parameters evaluated-growth promotion, enzymatic production or bio control. The best results were observed for Enterobacter sp. LGMB221 and Bacillus sp. LGMB242 that showed the high potential for growth promotion, acting in the early stage of maize seedlings development. Bacillus sp. LGMB152 showed the best enzymatic results, indicating that it might play a role against pathogens, a premise supported by the antagonist activity observed. The next steps involve evaluations under field conditions to confirm if these isolates have biotechnological potential as inoculants for the maize crop. In addition, we suggest that Enterobacter strains LGMB221 and LGMB235 and Escherichia strain LGMB159 might represent new species, indicating the high diversity of bacteria in maize rhizosphere that remains to be determined.

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Cercospora zeina is the main species causing gray leaf spot in southern and central Brazilian maize regions

Cited by 9 publications

References 18 publications

Systems genetics reveals a transcriptional network associated with susceptibility in the maize–grey leaf spot pathosystem

Systems genetics reveals a transcriptional network associated with susceptibility in the maize–grey leaf spot pathosystem

Cercospora zeina from Maize in South Africa Exhibits High Genetic Diversity and Lack of Regional Population Differentiation

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