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

Frontiers in Plant Science
Xu JinUrs Fischer

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 formation of an abscission zone. Several auxin transporters were down-regulated during abscission and inhibition of polar auxin transport delayed leaf shedding. Ethylene signaling was not involved in the regulation of these auxin transporters and in the formation of an abscission zone, but was required for the expression of hydrolytic enzymes associated with cell separation. Since exogenous auxin delayed abscission in absence of ethylene signaling ...Continue Reading

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Citations

Oct 11, 2017·Journal of Experimental Botany·O Rahul Patharkar, John C Walker
Sep 24, 2020·International Journal of Molecular Sciences·Aleksandra Bogumiła FlorkiewiczEmilia Wilmowicz
Jan 24, 2019·Frontiers in Plant Science·Andrea PolleAntoine Harfouche
Apr 25, 2020·International Journal of Molecular Sciences·Dingsha JinMeizhen Song
May 31, 2020·International Journal of Molecular Sciences·Agata KućkoJuan De Dios Alché

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Datasets Mentioned

BETA
GSE69277

Methods Mentioned

BETA
transgenic
PCR

Software Mentioned

Robin
JOINTLESS

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