The trehalose 6-phosphate pathway impacts vegetative phase change in Arabidopsis thaliana

Sammanfattning

The vegetative phase change marks the beginning of the adult phase in the life cycle of plants and is associated with a gradual decline in the microRNA miR156, in response to sucrose status. Trehalose 6-phosphate (T6P) is a sugar molecule with signaling function reporting the current sucrose state. To elucidate the role of T6P signaling in vegetative phase change, molecular, genetic, and metabolic analyses were performed using Arabidopsis thalianaloss-of-function lines in TREHALOSE PHOSPHATE SYNTHASE1(TPS1), a gene coding for an enzyme that catalyzes the production of T6P. These lines show a significant delay in vegetative phase change, under both short and long day conditions. Induced expression of TPS1 complements this delay in the TPS1 knockout mutant (tps1-2 GVG::TPS1). Further analyses indicate that the T6P pathway promotes vegetative phase transition by suppressing miR156 expression and thereby modulating the levels of its target transcripts, the SQUAMOSA PROMOTER BINDING PROTEIN-LIKE genes.TPS1 knockdown plants, with a delayed vegetative phase change phenotype, accumulate significantly more sucrose than wild-type plants as a result of a feedback mechanism. In summary, we conclude that the T6P pathway forms an integral part of an endogenous mechanism that influences phase transitions dependent on the metabolic state.

Nyckelord

age pathway; miR156; SQUAMOSA PROMOTER BINDING PROTEIN-LIKE (SPL); trehalose 6-phosphate (T6P); TREHALOSE PHOSPHATE SYNTHASE1 (TPS1); vegetative phase change

Publicerad i

Plant Journal
2020, volym: 104, nummer: 3, sidor: 768-780
Utgivare: WILEY

SLU författare

• Schmid, Markus

  • Max Planck Institut für Entwicklungsbiologie

UKÄ forskningsämne

Biokemi och molekylärbiologi
Botanik

Publikationens identifierare

• DOI: https://doi.org/10.1111/tpj.14965

Permanent länk till denna sida (URI)

https://res.slu.se/id/publ/127145