Published in Scientific Papers. Series B, Horticulture, Vol. LXVIV, Issue 2
Written by Alina-Nicoleta PARASCHIV, Aurelia DIACONU, Gheorghe COTEȚ, Ștefan NANU, Floriana Maria ȘTEFAN, Cristina BÎRSOGHE
This study presents the research conducted at the Dăbuleni Research and Development Station for Plant Culture on Sands, which aimed at monitoring the physiological reactions of 11 potato genotypes, in order to determine their tolerance to the thermo-hydric stress characteristic of the sandy soil area in southern Oltenia. At an air temperature between 33.4-35.07°C and a very strong solar radiation, between 1800-2090 μmol/m2/s, the photosynthesis rate ranged between 6.08 μmol CO2/m2/s for the TS 12-1489-1576 genotype and 15.46 μmol CO2/m2/s for the 22-1941/8 genotype. Calculating the water use efficiency, as the ratio between the photosynthesis rate and transpiration (μmol / mmol), in all experimental variants supraunitary values were obtained, which demonstrates that the plants efficiently used the water lost through transpiration. From this point of view, the genotypes TS 09-1441-1525, TS 12-1489-1576 and TS 16-1527-1867 were highlighted. Between stomatal conductance and the physiological processes of photosynthesis and foliar transpiration, statistically significant correlations were established.
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