The Plant Hormone Ethylene Restricts Growth Via the Epidermis

Overview

Journal Proc Natl Acad Sci U S A

Specialty Science

Date 2018 Apr 13

PMID 29643073

Citations 62

Authors

Irina Ivanova Vaseva

Enas Qudeimat

Thomas Potuschak

Yunlong Du

Pascal Genschik

Filip Vandenbussche

Dominique Van Der Straeten

Affiliations

Soon will be listed here.

Abstract

The gaseous hormone ethylene plays a key role in plant growth and development, and it is a major regulator of stress responses. It inhibits vegetative growth by restricting cell elongation, mainly through cross-talk with auxins. However, it remains unknown whether ethylene controls growth throughout all plant tissues or whether its signaling is confined to specific cell types. We employed a targeted expression approach to map the tissue site(s) of ethylene growth regulation. The ubiquitin E3 ligase complex containing Skp1, Cullin1, and the F-box protein EBF1 or EBF2 (SCF) target the degradation of EIN3, the master transcription factor in ethylene signaling. We coupled EBF1 and EBF2 to a number of cell type-specific promoters. Using phenotypic assays for ethylene response and mutant complementation, we revealed that the epidermis is the main site of ethylene action controlling plant growth in both roots and shoots. Suppression of ethylene signaling in the epidermis of the constitutive ethylene signaling mutant was sufficient to rescue the mutant phenotype, pointing to the epidermis as a key cell type required for ethylene-mediated growth inhibition.

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