Natural variants of <i>AGL80.5</i> and <i>FPA.3</i> contribute to bud break timing in poplar by controlling auxin biosynthesis.

ABSTRACT: The molecular mechanisms governing phenological characteristics and local adaptation in woody perennials remain largely unexplored. Here, we identified that AGAMOUS-LIKE 80 (PtoAGL80.5) and FLOWERING TIME CONTROL PROTEIN FPA (PtoFPA.3) were simultaneously associated with photoperiod factors and bud break (BB) timing in Populus tomentosa. Transgenic experiments in growth chamber and two latitudinal field trials confirmed their positive roles in promoting BB. Both are activated by the canonical phenological regulator SUPPRESSOR OF OVEREXPRESSION OF CO 1, which, in turn, up-regulates the auxin biosynthesis gene TRYPTOPHAN AMINOTRANSFERASE-RELATED (PtoTAR2.1), accelerating BB via auxin pathway. As superior haplotypes, PtoFPA.3^HAP1

SUBMITTER: Li L 

PROVIDER: S-EPMC12716395 | biostudies-literature | 2025 Dec

REPOSITORIES: biostudies-literature