Role of <i>SVP</i> in the control of flowering time by ambient temperature in <i>Arabidopsis</i>

TLDR

Plants must perceive and rapidly respond to changes in ambient temperature for their successful reproduction. The study demonstrates that Arabidopsis SVP is crucial for plant responses to ambient temperature changes and proposes it as a molecular mechanism modulating flowering time under fluctuating temperatures. SVP mediates temperature‑dependent functions of FCA and FVE and negatively regulates FT expression by binding CArG motifs, thereby controlling flowering time. Loss of SVP function causes insensitivity to ambient temperature changes.

Abstract

Plants must perceive and rapidly respond to changes in ambient temperature for their successful reproduction. Here we demonstrate that Arabidopsis SHORT VEGETATIVE PHASE ( SVP ) plays an important role in the response of plants to ambient temperature changes. The loss of SVP function elicited insensitivity to ambient temperature changes. SVP mediates the temperature-dependent functions of FCA and FVE within the thermosensory pathway. SVP controls flowering time by negatively regulating the expression of a floral integrator, FLOWERING LOCUS T ( FT ), via direct binding to the CArG motifs in the FT sequence. We propose that this is one of the molecular mechanisms that modulate flowering time under fluctuating temperature conditions.