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Biochemical adaptations and morphological changes are cellular aptitude originated on biotic and abiotic stresses. Polyethylene glycol (PEG) induces drought stress in the nutrient solution. In the present investigation, Caralluma tuberculata calli is exposed to PEG and antioxidative molecules. By increasing the level of antioxidative enzymes (SOD, POD, CAT, APX, and GR), the PEG-stressed calli falls off upon exposure to non-enzymatic antioxidants (ascorbic acid and salicylic acid). Under PEG-stress, several cellular and sub-cellular changes such as alteration in plasma membrane thickness, change in nucleus shape, increase in nucleoli, deformation of thylakoid membranes, and increase in plastoglobuli are observed through electron microscopic images. From our results we conclude that application of PEG (a drought causative agent) leads to an increase in the level of antioxidative enzymes and also deformation of cellular organelles. However, application of ascorbic acid and salicylic acid eradicate drought effect induced by PEG.

Salicylic acid and ascorbic acid retrieve activity of antioxidative enzymes and structure of Caralluma tuberculata calli on PEG stress