Auxin-independent effects of apical dominance induce changes in phytohormones correlated with bud outgrowth.

ABSTRACT: The inhibition of shoot branching by the growing shoot tip of plants, termed apical dominance, was originally thought to be mediated by auxin. Recently, the importance of the shoot tip sink strength during apical dominance has re-emerged with recent studies highlighting roles for sugars in promoting branching. This raises many unanswered questions on the relative roles of auxin and sugars in apical dominance. Here we show that auxin depletion after decapitation is not always the initial trigger of rapid cytokinin (CK) increases in buds that are instead correlated with enhanced sugars. Auxin may also act through strigolactones (SLs) which have been shown to suppress branching after decapitation, but here we show that SLs do not have a significant effect on initial bud outgrowth after decapi

SUBMITTER: Cao D 

PROVIDER: S-EPMC10231355 | biostudies-literature | 2023 May

REPOSITORIES: biostudies-literature