Biodégradation des lignocelluloses de vigne (<i>Vitis vinifera</i> cv. Cabernet Sauvignon) par <i>Eutypa lata</i> (PERS. FR.) TUL.

Authors

  • B. Elghazali
  • G. Gas
  • J. Fallot

DOI:

https://doi.org/10.5073/vitis.1992.31.95-103

Keywords:

Eutypa lata, fungus, disease, pathotype, wood, lignin, cellulose, degradation, sugar, nitrogen, oxygen

Abstract

Biodegradation of lignocelluloses in grapevine (Vitis vinifera cv. Cabernet Sauvignon) by Eutypa lata (PERS. FR.) TUL.

The biodegradation of lignocelluloses in Vitis vinifera cv. Cabernet Sauvignon by the parasitic fungus Eutypa lata was studied in dependence on culture conditions. By use of lignocelluloses labelled with 14C in two different ways, it was possible for the first time to determine the degradation rates of two main parietal constituents, cellulose and lignin. The rate of lignin decomposition in the overall degradation was constantly weak. This can explain the prolonged time span needed for mycelium development in the trunk or in the arms (3-10 years). The just slight lignin degradation may also be responsible for the hardness of the attacked tissue.
The fungus activity was stimulated when E. lata was cultivated in media of low nitrogen and sugar concentration and in an atmosphere which was rich in oxygen. These reactions are similar to those shown by Phanerochaete chrysosporium, lignivorous fungus most often reported.
Several pathotypes of E. lata showed similar aggressiveness, whereas in studies using other model systems their toxicity was more or less different.

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Published

2015-10-08

Issue

Vol. 31 No. 2 (1992): Vitis

Section

Article

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