The BHLH Transcription Factor HBI1 Mediates the Trade-off Between Growth and Pathogen-associated Molecular Pattern-triggered Immunity in Arabidopsis

Overview

Journal Plant Cell

Publisher Oxford University Press

Specialties Biology
Cell Biology

Date 2014 Feb 20

PMID 24550223

Citations 96

Authors

Min Fan

Ming-Yi Bai

Jung-Gun Kim

Tina Wang

Eunkyoo Oh

Lawrence Chen

Chan Ho Park

Seung-Hyun Son

Seong-Ki Kim

Mary Beth Mudgett

Zhi-Yong Wang

Affiliations

Soon will be listed here.

Abstract

The trade-off between growth and immunity is crucial for survival in plants. However, the mechanism underlying growth-immunity balance has remained elusive. The PRE-IBH1-HBI1 tripartite helix-loop-helix/basic helix-loop-helix module is part of a central transcription network that mediates growth regulation by several hormonal and environmental signals. Here, genome-wide analyses of HBI1 target genes show that HBI1 regulates both overlapping and unique targets compared with other DNA binding components of the network in Arabidopsis thaliana, supporting a role in specifying network outputs and fine-tuning feedback regulation. Furthermore, HBI1 negatively regulates a subset of genes involved in immunity, and pathogen-associated molecular pattern (PAMP) signals repress HBI1 transcription. Constitutive overexpression and loss-of-function experiments show that HBI1 inhibits PAMP-induced growth arrest, defense gene expression, reactive oxygen species production, and resistance to pathogen. These results show that HBI1, as a component of the central growth regulation circuit, functions as a major node of crosstalk that mediates a trade-off between growth and immunity in plants.

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