Journal
ANNUAL REVIEW OF PLANT BIOLOGY, VOL 72, 2021
Volume 72, Issue -, Pages 737-760Publisher
ANNUAL REVIEWS
DOI: 10.1146/annurev-arplant-050718-095929
Keywords
embryogenesis; flowering; shoot branching; sucrose; SUCROSE-NONFERMENTING1-RELATED KINASE1; trehalose 6-phosphate
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Funding
- Australian Research Council [FL180100139]
- Max Planck Society
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Tre6P functions as both a signal and homeostatic regulator of sucrose levels in plants, influencing developmental decisions related to future sucrose demand. Its interactions with SUCROSE-NON-FERMENTING1-RELATED KINASE1 are complex and not fully understood, while its synthesis and dephosphorylation processes involve enzymes that play crucial roles in coordinating sucrose supply and demand in plants.
Trehalose 6-phosphate (Tre6P) has a dual function as a signal and homeostatic regulator of sucrose levels in plants. In source leaves, Tre6P regulates the production of sucrose to balance supply with demand for sucrose from growing sink organs. As a signal of sucrose availability, Tre6P influences developmental decisions that will affect future demand for sucrose, such as flowering, embryogenesis, and shoot branching, and links the growth of sink organs to sucrose supply. This involves complex interactions with SUCROSE-NON-FERMENTING1-RELATED KINASE1 that are not yet fully understood. Tre6P synthase, the enzyme that makes Tre6P, plays a key role in the nexus between sucrose and Tre6P, operating in the phloem-loading zone of leaves and potentially generating systemic signals for source-sink coordination. Many plants have large and diverse families of Tre6P phosphatase enzymes that dephosphorylate Tre6P, some of which have noncatalytic functions in plant development.
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