The effect of Uncinula necator (powdery mildew) and Botrytis cinerea infection of grapes on the levels of haze-forming pathogenesis-related proteins in grape juice and wine

The effect of Uncinula necator (powdery mildew) and Botrytis cinerea infection of grapes on the levels of haze-forming pathogenesis-related proteins in grape juice and wine

Powdery mildew on Chardonnay grapes resulted in increased levels of a grape thaumatin‐like protein, VvTL2, in the free run juice compared to that from uninfected grapes. These increased levels persisted through winemaking and at the highest level of infection (> 30% of bunches infected) had a sig...

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Bibliographic Details
Published in:Australian journal of grape and wine research Vol. 10; no. 2; pp. 125 - 133
Main Authors: GIRBAU, TERESA, STUMMER, BELINDA E., POCOCK, KENNETH F., BALDOCK, GAYLE A., SCOTT, EILEEN S., WATERS, ELIZABETH J.
Format: Journal Article
Language:English
Published: Oxford, UK Blackwell Publishing Ltd 01-07-2004
Subjects:
Botrytis cinerea
chitinases
heat-induced haze
oidium
PR proteins
umatin-like proteins
Uncinula necator
Vitaceae
Vitis vinifera
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Summary:Powdery mildew on Chardonnay grapes resulted in increased levels of a grape thaumatin‐like protein, VvTL2, in the free run juice compared to that from uninfected grapes. These increased levels persisted through winemaking and at the highest level of infection (> 30% of bunches infected) had a significant impact on the haziness in the wine following a heat test. Infection of Cabernet Sauvignon grapes (1–20% of bunches infected) did not affect the protein concentration of free run juice, and only traces of pathogenesis‐related (PR) proteins remained detectable in the Cabernet Sauvignon wines from either infected or healthy grapes. In contrast, infection of Chardonnay or Semillon grapes by Botrytis cinerea in the vineyard resulted in decreased levels of all PR proteins in the free run juice and in a total protein extract from infected berries compared to that from uninfected grapes. Similar trends were observed when B. cinerea was grown in the laboratory on surface‐sterilised berries or in filter‐sterilised juice.
Bibliography:istex:AFBD434AD1E9348C764BDF243C60B4134AF43D73
ArticleID:AJGW125
ark:/67375/WNG-LWBP7577-L
ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
ISSN:1322-7130
1755-0238
DOI:10.1111/j.1755-0238.2004.tb00015.x