THE EFFECT OF BUNCH LOCATION IN RELATION TO LIGHT AND TEMPERATURE ON FRUIT DEVELOPMENT AND MATURATION OF CV. PERLETTE (VITIS VINIFERA) VINES IN TWO TRAINING SYSTEMS

The microclimate within the vineyard and the vine canopy have a major effect of the physiology of the vine (7,8) bud differentiation (7), fruit growth (1,5,6) and maturation (3,4,6). The absorption of light radiation is dependent on the training form canopy size and row orientation (8). The degree of light interception was found to have a major effect on canopy and fruit temperature.
Temperature was shown to have a major role in berry growth (1,6) and ripening (2,5). The radiation effect on temperature is usually moderated by wind (6,8). The temperature of shaded fruit was shown to be 6–10°C lower than of exposed ones (5). Temperature above 30–32°C inhibit berry growth.
High temperature enhance the degradation of malic acid in the fruit during its third growth stage (1). High temperature (35°C) also reduce sugar accumulation (1,3). However, there are contradictory results whether this is due to a reduction in the photosynthetic efficiency or the sink potential of the fruit (4).

In this study we tried to determine the effect of two training systems on the microclimate near the exposed and inner bunches of cv.
Perlette and its effect on berry growth and maturation.

V International Symposium on Orchard and Plantation Systems

S. Lavee, S. Rauchberger

https://doi.org/10.17660/ActaHortic.1993.349.19