Interaction of salinity and chromium on pigments and photosystem II function of Portulaca oleracea L

The aim of this study was to investigate the interaction of salinity and chromium stress on some morphological and physiological characteristics of portulaca oleracea. In a completely randomized design with 3 replications and 4 salinity levels (0, 4, 8 and 12 dS/m) using sodium chloride every 4 days through irrigation and 5 levels of chromium (0, 7, 14, 21 and 28 mg/ml). Kg (dry weight of soil) experiment was performed and before sowing seeds in soil with increasing potassium dichromate to soil, different levels of chromium treatment were prepared. The values of ion leakage, fresh and dry weight and leaf area, chlorophyll a, b and total, chlorophyll stability coefficient, carotenoids, photosystem II efficiency and relative water content of leaves were measured after 60 days of planting. The results showed that with increasing different levels of chromium and salinity, a significant decreasing trend (P≤0.05) was observed in fresh and dry weight, leaf area, chlorophyll a, b and total, carotenoids, photosystem II efficiency. The lowest efficiency of photosystem II and the highest rate of ion leakage were observed at salinity levels of 12 dS/m and chromium 28 mg/kg. The interaction of salinity and chromium had a significant decreasing effect on chlorophyll content, fresh and dry weight and leaf area. Was alone. However, salinity and chromium reduced the growth of portulaca oleracea leaves.