The Rice Transcription Factor WRKY53 Suppresses Herbivore-Induced Defenses by Acting As a Negative Feedback Modulator of Mitogen-Activated Protein Kinase Activity

Overview

Journal Plant Physiol

Specialty Physiology

Date 2015 Oct 11

PMID 26453434

Citations 62

Authors

Lingfei Hu

Meng Ye

Ran Li

Tongfang Zhang

Guoxin Zhou

Qi Wang

Jing Lu

Yonggen Lou

Affiliations

Soon will be listed here.

Abstract

The mechanisms by which herbivore-attacked plants activate their defenses are well studied. By contrast, little is known about the regulatory mechanisms that allow them to control their defensive investment and avoid a defensive overshoot. We characterized a rice (Oryza sativa) WRKY gene, OsWRKY53, whose expression is rapidly induced upon wounding and induced in a delayed fashion upon attack by the striped stem borer (SSB) Chilo suppressalis. The transcript levels of OsWRKY53 are independent of endogenous jasmonic acid but positively regulated by the mitogen-activated protein kinases OsMPK3/OsMPK6. OsWRKY53 physically interacts with OsMPK3/OsMPK6 and suppresses their activity in vitro. By consequence, it modulates the expression of defensive, MPK-regulated WRKYs and thereby reduces jasmonic acid, jasmonoyl-isoleucine, and ethylene induction. This phytohormonal reconfiguration is associated with a reduction in trypsin protease inhibitor activity and improved SSB performance. OsWRKY53 is also shown to be a negative regulator of plant growth. Taken together, these results show that OsWRKY53 functions as a negative feedback modulator of MPK3/MPK6 and thereby acts as an early suppressor of induced defenses. OsWRKY53 therefore enables rice plants to control the magnitude of their defensive investment during early signaling.

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