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Figure 4: Overexpression of SlGRAS7 enhances tolerance to salt and drought stress treatment. (a) Quantitative RT-PCR analysis of SlGRAS7 from one-month-old plants sprayed with 200 mM NaCl and 100 mM D-mannitol. Expression data were normalized with an expression of SlGRAS7 in treated plants as 0 h set as 1. Asterisks show significant differences using Student’s -test (, ). (b) Photographs of representative plants after one month of NaCl salt treatment and of drought stress compared to control plants. (c, d) Total chlorophyll concentration and relative water content (RWC) of plants shown in (b) under salt stress. (e, f) Total chlorophyll concentration and relative water content (RWC) of plants shown in (b) under drought stress.