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.
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