ISHS Acta Horticulturae 526: V International Symposium on Grapevine Physiology
EFFECTS OF DOWNY MILDEW ON PHOTOSYNTHESIS OF GRAPEVINE LEAVES |
| Authors: | A. Giuntoli, S. Orlandini |
| Keywords: | Plasmopara viticola, Vitis vinifera, gas exchange, host-pathogen interaction, stress condition |
| Abstract:
Nowadays the approach on crop protection should consider the effect of disease on crop physiology to evaluate the consequences of disease on growth, development, yield and economical aspects. This approach finds its best expression in the application of simulation models, which represent a powerful tool to analyse the relationships between host and pathogen. They can offer a better understanding of patho-system dynamics, as well as the improvement of crop protection management. Among the processes that can be affected by pathogens, foliar diseases typically cause a reduction of photosynthesis and, therefore deeply alter the carbon balance of plant. Many papers have reported different hypotheses to explain alteration of photosynthesis and carbohydrates accumulation and translocation. However a mechanistic interpretation of how downy mildew (Plasmopara viticola Berl. et De Toni) affects the rate of photosynthesis in grapevine (Vitis vinifera L.) has not so far been reported. Moreover an estimation of reduction in assimilation is necessary for calculation of potential yield modification and evaluation of an economical threshold of intervention for disease management. This work focused on the physiological aspects of a downy mildew attack on grapevine (cv. Sangiovese) cultivated in Tuscany. Maximum rates of photosynthesis, respiration and transpiration were measured on healthy and diseased leaves by means of a portable gas-analyser. Data obtained were used to calculate daily trend of photosynthesis of diseased and healthy leaves. | |
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