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Resistance of Brazilian commercially grown maize genotypes to Macrospora Leaf Spot

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Title: Resistance of Brazilian commercially grown maize genotypes to Macrospora Leaf Spot
Authors: João Américo Wordell Filho, Rafael Dal Bosco Ducatti, Cristiano Nunes Nesi
Source: Acta Scientiarum: Agronomy, Vol 46, Iss 1 (2023)
Publisher Information: Eduem (Editora da Universidade Estadual de Maringá), 2023.
Publication Year: 2023
Collection: LCC:Agriculture (General)
Subject Terms: corn, leaf wetness duration, lesion expansion rate, severity, Stenocarpella macrospora., Agriculture (General), S1-972
More Details: Macrospora leaf spot (MLS), caused by the fungus Stenocarpella macrospora, is one of the most important diseases affecting maize in Brazil. However, there are no MLS-resistant cultivars commercially available. Therefore, this study aimed to investigate the lesion expansion rate of MLS in four maize genotypes, leaf wetness duration (0-, 6-, 12-, 18-, 24-, 30-, 36-, 42-, and 54-hour post-inoculation), disease development severity in three maize genotypes, and resistance/tolerance levels to MLS in 141 maize genotypes commercially grown in Brazil. The estimates were performed using logistic models adjusted to the parameters analyzed, except for resistance/tolerance levels, which were analyzed using proposed severity and resistance scales. The experiment was carried out at the Laboratory of Plant Phytopathology of the Epagri/Cepaf, Santa Catarina State, Brazil, from 2016 to 2020. Disease resistance was significantly different among genotypes and fungal isolates. However, none of the genotypes showed resistance or high tolerance levels to MLS. Leaf wetness duration influenced maximum disease severity, and lesion expansion rate differed significantly among the genotypes tested. All information generated in this study is essential for breeding programs of maize for MLS resistance
Document Type: article
File Description: electronic resource
Language: English
ISSN: 1679-9275
1807-8621
Relation: https://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/63370; https://doaj.org/toc/1679-9275; https://doaj.org/toc/1807-8621
DOI: 10.4025/actasciagron.v46i1.63370
Access URL: https://doaj.org/article/8e65ba9afc324b58bb8b4f97d61fca2a
Accession Number: edsdoj.8e65ba9afc324b58bb8b4f97d61fca2a
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  Data: Resistance of Brazilian commercially grown maize genotypes to Macrospora Leaf Spot
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  Data: <searchLink fieldCode="AR" term="%22João+Américo+Wordell+Filho%22">João Américo Wordell Filho</searchLink><br /><searchLink fieldCode="AR" term="%22Rafael+Dal+Bosco+Ducatti%22">Rafael Dal Bosco Ducatti</searchLink><br /><searchLink fieldCode="AR" term="%22Cristiano+Nunes+Nesi%22">Cristiano Nunes Nesi</searchLink>
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  Data: Acta Scientiarum: Agronomy, Vol 46, Iss 1 (2023)
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  Data: 2023
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  Data: Macrospora leaf spot (MLS), caused by the fungus Stenocarpella macrospora, is one of the most important diseases affecting maize in Brazil. However, there are no MLS-resistant cultivars commercially available. Therefore, this study aimed to investigate the lesion expansion rate of MLS in four maize genotypes, leaf wetness duration (0-, 6-, 12-, 18-, 24-, 30-, 36-, 42-, and 54-hour post-inoculation), disease development severity in three maize genotypes, and resistance/tolerance levels to MLS in 141 maize genotypes commercially grown in Brazil. The estimates were performed using logistic models adjusted to the parameters analyzed, except for resistance/tolerance levels, which were analyzed using proposed severity and resistance scales. The experiment was carried out at the Laboratory of Plant Phytopathology of the Epagri/Cepaf, Santa Catarina State, Brazil, from 2016 to 2020. Disease resistance was significantly different among genotypes and fungal isolates. However, none of the genotypes showed resistance or high tolerance levels to MLS. Leaf wetness duration influenced maximum disease severity, and lesion expansion rate differed significantly among the genotypes tested. All information generated in this study is essential for breeding programs of maize for MLS resistance
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  Data: https://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/63370; https://doaj.org/toc/1679-9275; https://doaj.org/toc/1807-8621
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      – Text: English
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        Type: general
      – SubjectFull: leaf wetness duration
        Type: general
      – SubjectFull: lesion expansion rate
        Type: general
      – SubjectFull: severity
        Type: general
      – SubjectFull: Stenocarpella macrospora.
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      – SubjectFull: Agriculture (General)
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      – TitleFull: Resistance of Brazilian commercially grown maize genotypes to Macrospora Leaf Spot
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