K. Uzunova, Z. Zlatev Abstract. Laboratory experiments were conducted to study the effect of soil drought on photosynthesis of young cowpea plants (Vigna unguiculata L.) – cv. Lagoa and cv. 1183. Drought conditions were imposed on 2-week-old plants by withholding water for 10 days. It

Z. Zlatev, T. Kolev Abstract. Changes of functional activity of the photosynthetic apparatus of four durum wheat cultivars under low positive temperature stress were studied. Parameters of chlorophyll fluorescence in dark-adapted and light-adapted leaves were analyzed, as well as leaf