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The research was carried out on the protected crops, greenhouses and solariums investigating the variations of photosynthesis, transpiration, stomatal conductance and also, sugars leaf fractions in different technological systems (organic and conventional) on the varieties of Capsicum annum L. (peppers) and Solanum melongena L. (eggplant). In May-June, photosynthesis, transpiration and stomatal conductance showed higher values for varieties from the conventional system, while in July these parameters are higher for organically grown varieties, especially at the basis and middle part of plant showing an increase in the latter fruiting phenophase. Wue, the A/E ratio, showed in flowering stage high and close values in classic and in organic systems. In ripening stage, Wue have a quite higher value in organic systems and where plants showed a slower growth than in classic. Higher values of substomatal CO2, Ci have been observed in organic systems which involved a slower rate of absorbtion of atmospheric CO2 in photosynthesis process than was observed in classic variants. In ripening phenophasis, in classic technology system, disaccharides fraction is increased because are involved in growth and sugars accumulation in fruit whilst the monosaccharides and polysaccharides decrease but varieties organically grown showed higher values of disaccharides and also of polysaccharides.

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