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The alleviation effects of exogenous putrescine treatment on the ultrastructure of and calcium ion flow rate in lettuce (Lactuca sativa L.) leaf cells under drought stress were studied. Lettuce seedlings were treated with foliar sprays of 0.1 mM putrescine for 8 days, after which drought stress was simulated by using 10% polyethylene glycol 6000. The morphological characteristics of the seedlings...
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