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Impact of drought stress on physiological parameters in tolerant and sensitive thyme [15]: (a) soil moisture (%); (b) water potential (bar); (c) water content (%); and (d) shoot dry weight (g). Drought stress was imposed by water withholding on one-month-old plants of tolerant and sensitive populations (Thymus serpyllum and Thymus vulgaris, respectively). Physiological parameters were recorded at 4-day intervals.
