Abstract
PsaF is a nuclear encoded gene for the subunit III of photosystem I. It is located at the lumenal side of the thylakoid membrane and interacts with plastocyanin. Starting from a low-level expression in the cotyledons of etiolated seedlings the gene is upregulated by light. Light can be replaced by Ca2+ or phosphoinositides like phorbol myristate acetate, an analogue of diacylglycerol. We tested the effects of these components on PsaF promoter-driven gene expression in roots and found that the PsaF promoter includes a positive regulatory region [-220/-179] activated by cytokinin and a negative regulatory region [-687/-221] activated by abscisic acid. In addition, the promoter is activated by Ca2+, mastoparan and phorbol myristate acetate which suggests a role for phospholipases and protein kinase C in PsaF gene expression.
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