Abstract
Photoreceptor phytochrome A (phyA) plays a key role both in the individual development and in the evolution of higher plants. It acts in three distinct modes — far-red light-induced very low fluence responses (VLFRs), high irradiance responses (HIRs), and red/far-red–reversible low fluence responses (LFRs). Signal transduction from phyA includes its transportation from the cytoplasm into the nucleus and activation of light-responsive genes there. It is also active in the cytoplasm. Two types of phyA speckles were detected upon its light-induced nucleocytoplasmic partitioning and a fraction remained in the cytoplasm. In this review, we present a concept that this complex picture of the phyA action is due, at least partially, to the existence of two phyA types in the cell differing by the structure of the N-terminus, probably, by its serine phosphorylation. These are phosphorylated water-soluble phyA′ and underphosphorylated ambiquitous phyA″ represented by two fractions — water-soluble and membrane-associated. From the analysis of the phyA pools’ activity in the regulation of phyA synthesis, seed germination, seedling establishment, and (proto)chlorophyll biosynthesis it is concluded that phyA″ is responsible for the regulation of seed germination, whereas in seedlings phyA′ mediates the VLFRs, and the water-soluble phyA″ fraction, the HIRs. The membrane-associated phyA″ is likely to be active in cytoplasmic photoregulatory events. Functional interaction between phyA and the defense-related hormone jasmonic acid is also considered.
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Dedicated to Professor Y. A. Vladimirov on his 90th birthday.
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Sineshchekov, V., Koppel, L. Phytochrome A in plants comprises two structurally and functionally distinct populations — water-soluble phyA′ and amphiphilic phyA″. Biophys Rev 14, 905–921 (2022). https://doi.org/10.1007/s12551-022-00974-2
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DOI: https://doi.org/10.1007/s12551-022-00974-2