GDSL LIPASE1 modulates plant immunity through feedback regulation of ethylene signaling

Hye Gi Kim, Sun Jae Kwon, Young Jin Jang, Myung Hee Nam, Joo Hee Chung, Yun Cheol Na, Hongwei Guo, Ohkmae K. Park

Research output: Contribution to journalArticlepeer-review

43 Citations (Scopus)


Ethylene is a key signal in the regulation of plant defense responses. It is required for the expression and function of GDSL LIPASE1 (GLIP1) in Arabidopsis (Arabidopsis thaliana), which plays an important role in plant immunity. Here, we explore molecular mechanisms underlying the relationship between GLIP1 and ethylene signaling by an epistatic analysis of ethylene response mutants and GLIP1-overexpressing (35S:GLIP1) plants. We show that GLIP1 expression is regulated by ethylene signaling components and, further, that GLIP1 expression or application of petiole exudates from 35S:GLIP1 plants affects ethylene signaling both positively and negatively, leading to ETHYLENE RESPONSE FACTOR1 activation and ETHYLENE INSENSITIVE3 (EIN3) down-regulation, respectively. Additionally, 35S:GLIP1 plants or their exudates increase the expression of the salicylic acid biosynthesis gene SALICYLIC ACID INDUCTION-DEFICIENT2, known to be inhibited by EIN3 and EIN3- LIKE1. These results suggest that GLIP1 regulates plant immunity through positive and negative feedback regulation of ethylene signaling, and this is mediated by its activity to accumulate a systemic signal(s) in the phloem. We propose a model explaining how GLIP1 regulates the fine-tuning of ethylene signaling and ethylene-salicylic acid cross talk.

Original languageEnglish
Pages (from-to)1776-1791
Number of pages16
JournalPlant physiology
Issue number4
Publication statusPublished - 2013 Dec

ASJC Scopus subject areas

  • Physiology
  • Genetics
  • Plant Science


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