Abstract
Myo-inositol is a ubiquitous metabolite of plants. It is synthesized by a highly conserved enzyme L-myo-inositol phosphate synthase (MIPS; EC 5.5.1.4). Myo-inositol is well characterized during abiotic stress tolerance but its role during growth and development is unclear. In this study, we demonstrate that the apical hook maintenance and hypocotyl growth depend on myo-inositol. We discovered the myo-inositol role during hook formation and its maintenance via ethylene pathway in Arabidopsis by supplementation assays and qPCR. Our results suggest an essential requirement of myo-inositol for mediating the ethylene response and its interaction with brassinosteroid to regulate the skotomorphogenesis. A model is proposed outlining how MIPS regulates apical hook formation and hypocotyl growth.
Highlights
Myo-inositol is a ubiquitous metabolite of plants
We demonstrate that myo-inositol is involved in hook formation during skotomorphogenesis
To decipher point of action of myo-inositol phosphate synthase in ethylene pathway, etiolated seedlings were supplemented with AgNO3
Summary
Myo-inositol is a ubiquitous metabolite of plants. It is synthesized by a highly conserved enzyme L-myo-inositol phosphate synthase (MIPS; EC 5.5.1.4). Our results suggest an essential requirement of myo-inositol for mediating the ethylene response and its interaction with brassinosteroid to regulate the skotomorphogenesis. The plant hormones, auxin and ethylene interaction leads to differential growth in the formation of apical hook[34]. They have been involved in differential growth in the apical hook[19,34]. Ethylene has a stimulatory effect on the auxin biosynthetic pathway[51] which suggests another mode of interaction at the hormone level As both auxin and ethylene are involved in the regulation of apical hook development, their activities are mutually coordinated. BR, ethylene and auxin affect each other and are necessary for apical hook formation
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