Published in Scientific Papers. Series B, Horticulture, Vol. LXVIV, Issue 2
Written by Georgeta Mihaela BUCUR, Elena DELIAN, Marinela Vicuța STROE, Roxana Mihaela FILIMON
In this study, we followed the physiological characteristics of three local table grape varieties, under conditions of thermal and hydric stress, which have an essential role in their transpiration and implicitly drought resistance. The varieties 'Augusta’, 'Victoria’ and 'Xenia’ were studied, in the phenophases of flowering, berry growth, veraison and ripening. The content of chlorophyll and carotenoid pigments was generally sub-unitary, compared to the values reported for grapevines (1.05-1.58 mg 100 g-1 FW). Regarding the number of stomata, the most were determined in the 'Augusta’ variety (123 stomata/mm2), followed by 'Xenia’ (98 stomata/mm2) and 'Victoria’ (88 stomata/mm2). The photosynthesis rate recorded maximum values in the flowering phenophase in the 'Augusta’ (16.14 μmols CO2 m-2s-1) and 'Xenia’ varieties (12.37 μmols CO2 m-2s-1), possibly also due to a high requirement for photoassimilates. In the 'Victoria’ variety, the highest value was reached at veraison (11.19 μmols CO2 m-2s-1). As a result, the recorded productions were diminished, without affecting the quality of the grapes.
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