Abstract
We set out to characterize some aspects of growth and metabolism of wheat seedlings that have grown for 7 days on media supplemented with gibberellic acid (GA3) or salicylic acid (SA), at concentrations of 10 μmol∙L-1 and 100 μmol∙L-1. Compared to control plants, increased concentration of glucose and lipid peroxidation products were observed in GA3 series, while higher levels of soluble proteins, glucose, acid phosphatase and peroxidase activity were measured in SA series. Data from photosynthetic pigment analysis pointed out minor differences regarding chlorophylls and carotenoids content in plants’ leaves, both within and between the groups. Although total carotenoid content didn’t vary markedly among the experimental variants, certain changes of the relative contribution of the pigments in the carotenoid pool were observed, mainly a decrease of neoxanthin content paralleled by an increase of violaxanthin content. However, as the biometric data have shown, plant growth was neither inhibited nor stimulated, irrespective of the growth conditions. The observed modulation of certain biochemical parameters may be considered as part of the plants’ adaptive responses to an environmental challenge, where the differences between GA3 and SA regarding bioavailability, mobility and specific mechanisms of action underlie the different outcomes.
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