Proteinase Inhibitor II Gene Expression Induced by Electrical Stimulation and Control of Photosynthetic Activity in Tomato Plants : ENVIRONMENTAL AND STRESS RESPONSES

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Mechanical damage and heat stimulation were used to activate proteinase inhibitor II (Pin2) gene expression in tomato plants in both treated (local induction) and non-treated tissues (systemic induction). Both stimuli have been shown to generate electrical signals, leading to a systemic activation of gene expression. Treatment of tomato leaves with electrical current resulted in the accumulation of Pin2 mRNA in the local and systemic leaves. Additionally, all treatments inducing Pin2 gene activity gave rise to a significant alteration of stomatal aperture. However, heat stimulation provoked a different response in the stomatal parameters than mechanical wounding or electric treatment. Both mechanical damage and electrical stimulation activated two characteristic time constants in the gas exchange relaxation kinetics. Conversely, heat stimulation resulted in only one major time constant. The results clearly show that direct current application to tomato leaves initiates Pin2 mRNA accumulation locally and systemically. In addition, they suggest the participation of a second slow electrical/hydraulic component in the wound response mechanism of tomato plants and a possible alternative pathway regulating heat-induced Pin2 gene expression.
日本植物生理学会の論文