Auxin is a long-range signal that acts independently of ethylene signaling on leaf abscission in Populus.

ABSTRACT: Timing of leaf abscission is an important trait for biomass production and seasonal acclimation in deciduous trees. The signaling leading to organ separation, from the external cue (decreasing photoperiod) to ethylene-regulated hydrolysis of the middle lamellae in the abscission zone, is only poorly understood. Data from annual species indicate that the formation of an auxin gradient spanning the abscission zone regulates the timing of abscission. We established an experimental system in Populus to induce leaf shedding synchronously under controlled greenhouse conditions in order to test the function of auxin in leaf abscission. Here, we show that exogenous auxin delayed abscission of dark-induced leaves over short and long distances and that a new auxin response maximum preceded the forma

SUBMITTER: Jin X 

PROVIDER: S-EPMC4532917 | biostudies-literature | 2015

REPOSITORIES: biostudies-literature