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Histopathology of the Shoot Apex of Sugarcane Colonized by Leifsonia xyli subsp. xyli.
Marques, João Paulo Rodrigues; Cia, Mariana Cicarelli; Batista de Andrade Granato, Adrielle; Muniz, Larissa Fernanda; Appezzato-da-Glória, Beatriz; Camargo, Luis Eduardo Aranha.
Afiliação
  • Marques JPR; Department of Basic Sciences, Faculty of Animal Science and Food Engineering, University of São Paulo, 13635-900, Pirassununga, São Paulo, Brazil.
  • Cia MC; Department of Plant Pathology and Nematology, Luiz de Queiroz College of Agriculture, University of São Paulo, 13418-900, Piracicaba, São Paulo, Brazil.
  • Batista de Andrade Granato A; Department of Biological Sciences, Luiz de Queiroz College of Agriculture, University of São Paulo, 13418-900, Piracicaba, São Paulo, Brazil.
  • Muniz LF; Department of Biological Sciences, Luiz de Queiroz College of Agriculture, University of São Paulo, 13418-900, Piracicaba, São Paulo, Brazil.
  • Appezzato-da-Glória B; Department of Biological Sciences, Luiz de Queiroz College of Agriculture, University of São Paulo, 13418-900, Piracicaba, São Paulo, Brazil.
  • Camargo LEA; Department of Plant Pathology and Nematology, Luiz de Queiroz College of Agriculture, University of São Paulo, 13418-900, Piracicaba, São Paulo, Brazil.
Phytopathology ; 112(10): 2062-2071, 2022 Oct.
Article em En | MEDLINE | ID: mdl-35509210
ABSTRACT
Colonization of the xylem of sugarcane by Leifsonia xyli subsp. xyli results in the occlusion of the vessels by a gum-like compound and compromises the elongation of the stalk leading to stunted plants. However, no study has been performed in the apical tissue where the elongation of the stalks initiates at the intercalary meristem (IM). Microscopic and histochemical analyses were performed in plants with lower and higher bacterial titers and revealed that in both cases L. xyli subsp. xyli is present in this tissue and colonizes the forming xylem vessels in a similar way as observed in developed internodes. In both cases, it was observed adhering to the secondary walls, but only in plants with higher titers were a mild degradation of the walls and a granular material filling the vessels observed. The mixed composition of lipids, proteins, and pectin indicates that the filling is not a bacterial extracellular polymeric substance. Plants with higher bacterial populations also presented lower starch content in the ground parenchyma at the node elements, possibly resulting from the reported downregulation of photosynthesis and increased accumulation of phenolics. Their second and third IMs presented fewer cells and reduced expression of genes related to the cell cycle and to the synthesis of ABA in the apical tissue. These results indicate that increased L. xyli subsp. xyli colonization affects the development of the IM, which ultimately would reduce the length of the internodes, resulting in the main symptom of the disease.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Actinomycetales / Saccharum Idioma: En Revista: Phytopathology Assunto da revista: BOTANICA Ano de publicação: 2022 Tipo de documento: Article País de afiliação: Brasil

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Actinomycetales / Saccharum Idioma: En Revista: Phytopathology Assunto da revista: BOTANICA Ano de publicação: 2022 Tipo de documento: Article País de afiliação: Brasil