DELLA1-Mediated Gibberellin Signaling Regulates Cytokinin-Dependent Symbiotic Nodulation

Overview

Journal Plant Physiol

Specialty Physiology

Date 2017 Oct 20

PMID 29046420

Citations 21

Authors

Camille Fonouni-Farde

Anna Kisiala

Mathias Brault

R J Neil Emery

Anouck Diet

Florian Frugier

Affiliations

Soon will be listed here.

Abstract

In legume plants, low-nitrogen soils promote symbiotic interactions with rhizobial bacteria, leading to the formation of nitrogen-fixing root nodules. Among critical signals regulating this developmental process are bacterial Nod Factors (NFs) and several plant hormones, including cytokinins (CKs) and gibberellins (GAs). Here, we show in that GA signaling mediated by DELLA1 decreases the amount of bioactive CKs in roots and negatively impacts the Cytokinin Response1 (CRE1)-dependent NF activation of a subset of CK-signaling genes as well as of the CK-regulated and early nodulation genes. Consistently, a dominant-active DELLA1 protein can partially rescue the reduced nodulation of the mutant and triggers the formation of nodule-like structures when expressed in the root cortex or in the root epidermis. This suggests a model where the DELLA1-mediated GA signaling interplays with the CRE1-dependent CK pathway to regulate early nodulation in response to both NF and CK signals critical for this symbiotic interaction.

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