Crosstalk with Jasmonic Acid Integrates Multiple Responses in Plant Development.

Geupil Jang,Youngdae Yoon,Yang Do Choi

doi:10.3390/ijms21010305

Abstract

To date, extensive studies have identified many classes of hormones in plants and revealed the specific, nonredundant signaling pathways for each hormone. However, plant hormone functions largely overlap in many aspects of plant development and environmental responses, suggesting that studying the crosstalk among plant hormones is key to understanding hormonal responses in plants. The phytohormone jasmonic acid (JA) is deeply involved in the regulation of plant responses to biotic and abiotic stresses. In addition, a growing number of studies suggest that JA plays an essential role in the modulation of plant growth and development under stress conditions, and crosstalk between JA and other phytohormones involved in growth and development, such as gibberellic acid (GA), cytokinin, and auxin modulate various developmental processes. This review summarizes recent findings of JA crosstalk in the modulation of plant growth and development, focusing on JA–GA, JA–cytokinin, and JA–auxin crosstalk. The molecular mechanisms underlying this crosstalk are also discussed.

Highlights

Plant growth and physiology are regulated by endogenous processes and environmental signals; phytohormones govern these processes by controlling transcriptional and translational networks
When jasmonic acid (JA) biosynthesis is activated in response to endogenous or environmental signals, and JA, especially JA-isoleucine conjugate (JA-Ile), accumulates in cells, JA-Ile activates JA signaling through interaction with the COI1 receptor
This review briefly describes the metabolism and signaling pathways of the phytohormones gibberellic acid (GA), cytokinin, and auxin that interact with JA in the modulation of plant growth and development, and recent findings on JA crosstalk, focusing on the JA–GA, JA–cytokinin, and JA–auxin interactions

Summary

Introduction

Plant growth and physiology are regulated by endogenous processes and environmental signals; phytohormones govern these processes by controlling transcriptional and translational networks. When JA biosynthesis is activated in response to endogenous or environmental signals, and JA, especially JA-Ile, accumulates in cells, JA-Ile activates JA signaling through interaction with the COI1 receptor This direct interaction induces proteolysis of the JAZ proteins and activates the expression of JA-responsive genes by releasing the MYC2 transcription factor from the JAZ–MYC2 complex [8]. As JAZs and MYC2 are key factors in plant growth and development as positive and negative regulators, respectively, they may mediate JA-dependent growth inhibition under stress conditions [12,13,14] Plant hormones have their own specific biosynthetic and signaling pathways, but their roles in plant development and physiology overlap. The molecular mechanisms underlying the JA–GA, JA–cytokinin, and JA–auxin interactions are discussed in this review

GA Metabolism and Signaling Pathway

The JA–GA Interaction and Its Underlying Molecular Mechanism

The JA–Cytokinin Interaction and Its Underlying Molecular Mechanism

Interaction of JA and Auxin and the Underlying Molecular Mechanism

Future Perspectives