RESULTS REGARDING THE TOLERANCE TO THERMO-HYDRIC STRESS OF SOME POTATO LINES CULTIVATED ON THE SANDY SOILS FROM THE SOUTH OF OLTENIA

DIACONU AURELIA, PARASCHIV ALINA-NICOLETA, NANU ŞTEFAN

Abstract


In this paper are presented the results regarding the physiological reactions of the 11 potato lines studied, on vegetation phenophases, in order to determine their tolerance to the thermo-hydric stress characteristic of the sandy soils area in the south of Oltenia. During the vegetation period, determinations were made with the LC Pro SD portable device, which focused on active solar radiation in photosynthesis, photosynthesis rate, air temperature, leaf transpiration rate and correlations established between these physiological parameters, specific climatic conditions of 2020 and production of potatoes obtained under these conditions. Between the physiological processes of photosynthesis and foliar transpiration, registered at RDSPCS Dăbuleni, a positive, distinctly significant correlation was established. The lines with higher tolerance to thermo-hydric stress showed an intense assimilation, directly proportional to the intensity of foliar transpiration. Lines L 15-1876 / 7 and L 18-1828 / 6 were noted in this regard. At the opposite pole, the lowest physiological activity was recorded on the lines L 1901/11 and L 1901/6.


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