Abstract
Salvia macrosiphon is a medicinal plant belonging to Lamiaceae family, which has many pharmaceutical properties. In the present investigation, effects of different levels of salinity [0.4 (control), 2.3, 4.5, 6.8 dS m−1] were studied on photosynthesis and some biochemical constituents of S. macrosiphon plants at vegetative stage. Our results showed that reduction in photosynthesis in salt stressed plants caused not only by reduction in available CO2 due to stomatal closure, but also by the cumulative effects of stomatal resistance and transpiration rate. Salinity caused a significant increase in leaves MDA content as compared to control plants. The amounts of chlorophylls a and b, and carotenoids in S. macrosiphon plants decreased with the increase in external salt concentration. Proline, total soluble carbohydrates, and total soluble protein accumulated significantly in tissues under salt stress. Results presented indicate that S. macrosiphon is able to tolerate low to moderate salinity. These findings should be taken into consideration in the commercial cultivation of this valuable medicinal plant.
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