Powdery mildew of <i>Vitis</i>: Papillae (wall appositions) as a host response to infection

Authors

  • Charlotte Pratt
  • M. C. Goffinet
  • M. J. Welser
  • R. C. Pearson

DOI:

https://doi.org/10.5073/vitis.1984.23.225-229

Abstract

Powdery mildew, caused by Uncinula necator (ScHW.) BURR., of grapevines, as exemplified by cv. Rosette, induces papillae (wall appositions) inside periclinal cell walls. Papillae occur in epidermal and subepidermal cells of leaves, petioles, cluster rachises and green shoots. Aniline blue fluorescence tests showed the papillae to be composed of callose (polysaccharides). Ultrastructurally, they are characterized by vesicles in the electron-dense material.

L'oïdium de la vigne: Papillae (appositions du paroi) comme un répons de l'hôte au infection 

L'oïdium, provoqué par Uncinula necator (ScHW.) BURR., de la vigne, par l'exemple du cultivar Rosette, produit papillae (appositions du paroi) en dedans des parois periclinales des cellules. On a vu les papillae dans des cellules épidermiques et subépidermiques des feuilles, des pétioles, des rafles et des rameaux verts. La fluorescence avec bleu d'aniline a démontré que les papillae consistent en callose (polysaccharides). Au microscope élect ronique à transmission, elles sont sombreuses aux électrons et elles se composent de vésicules.

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Published

2016-02-08

Issue

Vol. 23 No. 3 (1984): Vitis

Section

Article

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