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چکیده
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Salicylic acid have been found to play a key role in the regulation of plant growth, development, interaction with other organisms and in the responses to environmental stress. The effect of salicylic acid (1 mM) on growth parameters (root dry mass, crown dry mass, petiole dry mass, leaf dry mass, leaf area, leaf number and total biomass), leaf relative water content (RWC) and stomatal conductance (gs) in two strawberry cultivars ("Kurdistan" and "Queen elisa") was investigated under drought (-10 bar). "Kurdistan" is a local cultivar that grown in Kurdistan province in west of Iran. "Queen elisa" is new foreign cultivar that newly entered in this zon. Results showed that RWC and gs reduced by drought stress while RWC and gs were not altered by salicylic acid application. Reduction in some growth parameters obtained in both cultivars under drought stress. Root dry mass, Root volume and leaf number did not affect by drought and salicylic acid in both cultivars. Crown dry mass and petiole dry mass were reduced at drought stress in "Queen elisa" cultivar. Drought stress reduced leaf dry mass in both cultivars but salicylic acid did not effect on leaf dry mass. Leaf area decreased by drought stress significantly in two cultivars and acid did not altered by salicylic. Total dry mass in "Queen elisa" was higher than "Kurdistan" under control condition while total dry mass was equal at drought stress in both cultivars. Drought stress reduced total dry mass in "Queen elisa" but did not reduce by drought in "Kurdistan" cultivar. These results showed that drought reduced growth parameters in two strawberry cultivars. Lower reduction of total dry mass and higher RWC in "Kurdistan" cultivars may be related to higher tolerance of "Kurdistan" cultivar to drought in compare to "Queen elisa" cultivar. Results of this study showed that Salicylic acid could not alter physiological responses in strawberry
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