Articles
POLYPHENOLS AND RESISTANCE OF GRAPEVINES TO DOWNY MILDEW
Article number
381_110
Pages
763 – 766
Language
Abstract
Host-parasite interaction between the grapevines (Vitis spp.) and the downy mildew (Plasmopara viticola (B. C.) Berl. et de T.) have been studied using histochemical and biochemical analysis.
Research was closely connected with the genetic improvement programme to obtain a better knowledge of host-parasite interaction.
Three kinds of behavior, susceptible (S) (Vitis vinifera var.
Grenache), intermediate (M) (V. rupestris du Lot), and resistant (R) (V. rotundifolia var.
Carlos) were chosen for this study.
Analysis of healthy tissues showed that the resistant variety were enriched in gallic derivatives and catechic tannins as compared with the sensitive variety.
Crude foliar extracts of resistant variety (R) had a stronger antifungal activity than intermediate (M) and susceptible varieties (S). In response to infection by P. viticola, in R, the appearence of flavonoids at early stage, may play an important role in it’s resistance.
In M, catechic tannins increased, moreover flavonoids simultaneously accumulated near the vein at later period.
In S, there was only a little accumulation of flavonoids at later stage.
These data suggested that resistance of Vitis spp. against downy mildew involves pre-existing and induced chemical barriers.
Research was closely connected with the genetic improvement programme to obtain a better knowledge of host-parasite interaction.
Three kinds of behavior, susceptible (S) (Vitis vinifera var.
Grenache), intermediate (M) (V. rupestris du Lot), and resistant (R) (V. rotundifolia var.
Carlos) were chosen for this study.
Analysis of healthy tissues showed that the resistant variety were enriched in gallic derivatives and catechic tannins as compared with the sensitive variety.
Crude foliar extracts of resistant variety (R) had a stronger antifungal activity than intermediate (M) and susceptible varieties (S). In response to infection by P. viticola, in R, the appearence of flavonoids at early stage, may play an important role in it’s resistance.
In M, catechic tannins increased, moreover flavonoids simultaneously accumulated near the vein at later period.
In S, there was only a little accumulation of flavonoids at later stage.
These data suggested that resistance of Vitis spp. against downy mildew involves pre-existing and induced chemical barriers.
Authors
G.H. DAI, C. ANDARY, L. COSSON-MONDOLOT, D. BOUBALS
Keywords
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