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Arabidopsis GDSL lipase 2 plays a role in pathogen defense via negative regulation of auxin signaling

Authors
Lee, Dong SookKim, Bo KyungKwon, Sun JaeJin, Hak ChulPark, Ohkmae K.
Issue Date
20-Feb-2009
Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
Keywords
Arabidopsis; GDSL lipase; Pathogen resistance; Auxin signaling; GLIP2; Erwinia carotovora
Citation
BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS, v.379, no.4, pp.1038 - 1042
Indexed
SCIE
SCOPUS
Journal Title
BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS
Volume
379
Number
4
Start Page
1038
End Page
1042
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/120568
DOI
10.1016/j.bbrc.2009.01.006
ISSN
0006-291X
Abstract
GLIP1 was isolated previously from Arabidopsis, as a salicylic acid-responsive secreted GDSL lipase that functions in resistance to Alternaria brassicicola [I.S. Oh, A.R. Park, M.S. Bae, S.J. Kwon, Y.S. Kim, J.E. Lee, N.Y. Kang, S. Lee, H. Cheong, O.K. Park, Secretome analysis reveals an Arabidopsis lipase involved in defense against Alternaria brassicicola. Plant Cell 17 (2005) 2832-2847.]. To extend our knowledge of the roles played by GLIPs in Arabidopsis, we conducted functional studies of another family member, GLIP2. GLIP2 transcripts were expressed in young seedlings, as well as in the root and stem tissues of mature plants. GLIP2 transcript levels were elevated by treatment with salicylic acid, jasmonic acid and ethylene. Recombinant GLIP2 proteins possessed lipase and anti-microbial activities, inhibiting germination of fungal spores. In comparison to wild type plants, T-DNA insertion glip2 mutants exhibited enhanced auxin responses, including increased lateral root formation and elevated AUX/IAA gene expression. When challenged with the necrotropic bacteria Erwinia carotovora, glip2 mutants exhibited more susceptible phenotypes than wild type plants. These results suggest that GLIP2 plays a role in resistance to Erwinia carotovora via negative regulation of auxin signaling. (C) 2009 Elsevier Inc. All rights reserved.
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