Effets de l'eutypiose sur des feuilles de <i>Vitis vinifera</i> cv. Cabernet Sauvignon. Etude cytologique

Authors

  • I. Philippe
  • J. Fallot
  • M. Petitprez
  • R. Dargent

DOI:

https://doi.org/10.5073/vitis.1992.31.45-53

Keywords:

Eutypa lata, fungus, disease, leaf, cell, chloroplast, plasmalemma, ultrastructure, cytology

Abstract

Effects of Eutypa dieback on the leaves of Vitis vinifera cv. Cabernet Sauvignon.
Cytological studies

The fungus Eutypa lata only grows in lignified wood (trunk and arms) and causes at a distance typical symptoms on the leaves of Vitis vinifera cv. Cabernet Sauvignon, a very sensitive variety. For the first time, lesions induced in vivo in leaf cells were examined by transmission electron microscopy. The main alterations of ultrastructure are depending on the level of disease.

In the cells of slightly affected leaves, the enlarged chloroplasts show dilated thylakoids with a lowered electron density and sometimes contain very large starch grains. In the severely affected leaves, the cells are completely disorganized, with plasmalemma retraction, chloroplast degradation, cytoplasm lysis and endomembrane breakdown.

These results suggest that structural decline of the photosynthetic system can be responsible, at least partly, for the death of Cabernet Sauvignon grapevines.

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Published

2015-10-08

Issue

Vol. 31 No. 1 (1992): Vitis

Section

Article

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