PIGMENT CHANGES OF RUBINIA TINCTORUM ROOT UNDER DIFFERENT LEVELS OF SALINITY AND THEIR RELATIONSHIP WITH SOME CHEMICAL CHARACTERISTICS OF WATER

To achieve sustainable development in water, soil, and medicinal and industrial plant issues, and also, according to different uses of Rubinia tinctorum, especially in dye industry and the importance of salinity in it, this study was carried out to investigate the effect of water salinity stress on Pigments changes of Rubinia tinctorum Root and their relationship with some chemical characteristics of water in 6 regions under cultivation of this plant. This experiment was done on the basis of a compllyete randomized design with three replications in 6 regions under cultivation of it. After sampling and determining the electrical conductivity of irrigation water, the water samples were classified into three groups of 4, 4-8, and 8-16 ds/m and the effect of salinity on desire parameters was investigated. Data analysis was done using SPSS and Excel software. The results showed that with increasing salinity, the wool brightness (L*) was decreased (p<0.01). The amount of A* (redness and greenness) (p<0.05) and B* (yellowness and blueness) (P<0.01) parameters was increased with increasing water salinity. Investigation of the correlation between some chemical characteristics of water and pigments parameters, showed that there is a negative correlation between B* parameter and water acidity. There is also a negative correlation between L* parameter and all chemical characteristics of water except acidity (p<0.01). However, there is a positive correlation between A* parameter and electrical conductivity and SAR, so that A* parameter increases after increasing these parameters (p<0.01). In general, the quality of Rubinia tinctorum color was increased with increasing water salinity. So, progressing toward economic production of this industrial and medicinal plant is possible by using appropriate salinity treatments.