Iulia Mineață, Ionuț Vasile Ungureanu, Sorina Sîrbu, Iuliana Elena Golache, Ionel Perju, Mihai Istrate, Carmen Doina Jităreanu
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canopy, chlorophyll, leaves, pigments, stomatal conductance
Sweet cherry has the highest intensity of photosynthesis among all stone fruit crops, thus, studies on the physiological processes of using lighting resources and improving photosynthetic activity provide a theoretical basis for increasing and stabilizing fruit production. The purpose of the present study was to evaluate the photosynthesis process by determining the amount of active photosynthetic pigments and the stomatal conductance at the leaf level, under the aspect of the light intensity at the tree canopy level. The research was carried out over two years (2022-2023) on three sweet cherry cultivars (‘Van’, ‘Andreiaș’ and ‘Margonia’), in three distinct phenological stages, according to the BBCH scale (65-full flowering, 75-fruit growth and 89-fruit ripening), with samples taken from two areas of the tree canopy: the external, peripheral part and the internal part, close to the trunk. The obtained results revealed a higher content of chlorophyll a in the internal part of the canopy and during the observed phenophases, the total content of chlorophyll pigments (chlorophyll a and b) increased from 11.06 mg/100g F.W in the flowering stage and 12.96 mg/100g F.W in the fruit growth stage, up to maximum values of 25.84 mg/100g F.W at fruit ripening. The stomatal conductance had average values between 6.70 and 12.52 mmol/m²/s and in correlation with the light intensity, significant correlation coefficients (R2) were obtained: 0.984 at ‘Van’, 0.978 at ‘Andreiaș’ and 0.928 at ‘Margonia’ cultivar. The intensity of the physiological processes varied depending on the light intensity, climatic conditions, cultivar and canopy area.
Cite this paper: Mineață, I., Ungureanu, I.V., Sîrbu, S., Golache, I.E., Perju, I., Istrate, M., Jităreanu, C.D. (2024). THE PROCESS OF PHOTOSYNTHESIS AND THE LIGHT REGIME OF SOME SWEET CHERRY CULTIVARS FROM THE NORTH-EAST OF ROMANIA. Current Trends in Natural Sciences, 13(25), 207-213. https://doi.org/10.47068/ctns.2024.v13i25.025
