Data/hora: 20/05/2024 14:37:31

Biblioteca(s): | Epagri-Sede.
Data corrente: | 28/09/2017
Data da última atualização: | 28/09/2017
Autoria: | HAWERROTH, C.; ARAUJO, L.; RODRIGUES, F. Á.
Título: | Infection process of Gaeumannomyces graminis var. graminis on the roots and culms of rice.
Ano de publicação: | 2017
Fonte/Imprenta: | Journal of Phytopathology, Germany, n. 165, p. 692-700, 2017.
Idioma: | Inglês

Conteúdo:

Crown sheath rot, caused by the ascomycete Gaeumannomyces graminis var. graminis
that infects the root and the base of the culm of rice, causes early grains maturation,
tiller death and reduced yield. As a paucity of information exists in the literature on the
rice-G. graminis var. graminis interaction at the microscopic level, this study aimed to
gain novel insights into the infection process of this pathogen in the root and culm of
rice using both light and scanning electron microscopy. In the roots, the fungus initially
colonized the epidermal, exodermal and sclerenchyma cells. At 15 days after inoculation
(dai), fungal hyphae colonized the cortex and clusters of perithecia were observed
in the roots. At 20 dai, the fungus reached the central cylinder, and an intense fungal
colonization at the base of the culm was observed that resulted in the formation of a
mycelial mat on both adaxial and abaxial surfaces of the leaf sheaths. At 25 dai, fungal
growth was noticed in the parenchyma cells, vascular bundles and airspaces. Perithecia
emerged through the base of prophyllum and from the first leaf sheath at 30 dai. The
results of this study provide new insights into the infection process of G. graminis var.
graminis in rice and may help to find better control measures in reducing crown sheath
rot development.

Palavras-Chave: | crown sheath rot; Oryza sativa L; perithecium; scanning electron microscopy.
Categoria do assunto: | F Plantas e Produtos de Origem Vegetal
URL: | http://intranetdoc.epagri.sc.gov.br/producao_tecnico_cientifica/DOC_39860.pdf
Registro original: | Epagri-Sede (Epagri-Sede)
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