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Heterotrimeric G proteins facilitate arabidopsis resistance to necrotrophic pathogens and are involved in jasmonate signaling

Trusov, Yuri, Rookes, James Edward, Chakravorty, David, Armour, David, Schenk, Peer Martin and Botella, Jose Ramon 2006, Heterotrimeric G proteins facilitate arabidopsis resistance to necrotrophic pathogens and are involved in jasmonate signaling, Plant physiology, vol. 140, no. 1, pp. 210-220.

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Title Heterotrimeric G proteins facilitate arabidopsis resistance to necrotrophic pathogens and are involved in jasmonate signaling
Author(s) Trusov, Yuri
Rookes, James Edward
Chakravorty, David
Armour, David
Schenk, Peer Martin
Botella, Jose Ramon
Journal name Plant physiology
Volume number 140
Issue number 1
Start page 210
End page 220
Publisher American Society of Plant Physiologists
Place of publication Bethesda, Md.
Publication date 2006-01
ISSN 0032-0889
1532-2548
Summary Heterotrimeric G proteinshave been previously linked to plant defense; however a role for the Gbg dimer in defense signaling has not been described to date. Using available Arabidopsis (Arabidopsis thaliana) mutants lacking functional Ga or Gb subunits, we show that defense against the necrotrophic pathogens Alternaria brassicicola and Fusarium oxysporum is impaired in Gb-deficient mutants while Ga-deficient mutants show slightly increased resistance compared to wild-type Columbia ecotype plants. In contrast, responses to virulent (DC3000) and avirulent (JL1065) strains of Pseudomonas syringae appear to be independent of heterotrimeric G proteins. The induction of a number of defense-related genes in Gb-deficient mutants were severely reduced in response to A. brassicicola infection. In addition, Gb-deficient mutants exhibit decreased sensitivity to a number of methyl jasmonate-induced responses such as induction of the plant defensin gene PDF1.2, inhibition of root elongation, seed germination, and growth of plants in sublethal concentrations of methyl jasmonate. In all cases, the behavior of the Ga-deficient mutants is coherent with the classic heterotrimeric mechanism of action, indicating that jasmonic acid signaling is influenced by the Gbg functional subunit but not by Ga. We hypothesize that Gbg acts as a direct or indirect enhancer of the jasmonate signaling pathway in plants.
Language eng
Field of Research 060705 Plant Physiology
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©2005, American Society of Plant Biologists
Persistent URL http://hdl.handle.net/10536/DRO/DU:30022126

Document type: Journal Article
Collection: School of Life and Environmental Sciences
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