Root-derived cytokinin regulates Arabidopsis flowering time through components of the age pathway.

ABSTRACT: The transition to flowering is governed by different pathways integrating endogenous and exogenous signals. Here, we evaluated the role of the phytohormone cytokinin (CK) in regulating Arabidopsis thaliana flowering time. By analyzing key mutants in CK metabolism, transport, and signaling, we found that the hormone promotes flowering under both long-day (LD) and short-day (SD) conditions, with a stronger impact on flowering under SDs. Genetic analyses indicated that both trans- and cis-zeatin regulate the floral transition, while isopentenyladenine plays a minor role. Blocking CK export from roots and reciprocal grafting experiments revealed that root-derived CK is an important flowering signal. Perception and transmission of the CK flowering signal depended on distinct CK receptors, phosp

SUBMITTER: Bartrina I 

PROVIDER: S-EPMC12311289 | biostudies-literature | 2025 Jul

REPOSITORIES: biostudies-literature