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Vitamin C and the abscisic acid-insensitive 4 (ABI4) transcription factor are important determinants of aphid resistance in Arabidopsis.
MedLine Citation:
PMID:  23343093     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Aims: Aphids, like other insects, are probably unable to synthesize vitamin C (ascorbic acid), which is therefore an essential dietary nutrient that has to be obtained from the host plant. Plant responses to aphids involve hormones such as salicylic acid (SA), jasmonic acid (JA) and abscisic acid (ABA) but hormone/redox interactions remain poorly characterized. We therefore investigated hormone/redox signaling in the response of Arabidopsis thaliana to infestation by the aphid Myzus persicae, focusing on interactions between ascorbic acid and ABA, together with the influence of altered ascorbate and ABA signaling on SA and JA-dependent pathways. Results: Whole genome microarray analysis revealed highly dynamic transcriptional responses to aphid infestation with extensive differences between transcript profiles of infested and systemic leaves, revealing aphid-dependent effects on suites of transcripts involved in redox, SA and ABA responses. Central roles for ascorbate, ABA INSENSITIVE-4 and OXIDATIVE SIGNAL-INDUCIBLE1 (OXI1) in plant resistance to aphids were demonstrated by altered fecundity on respective mutants. However, ABA had a negative effect on aphid resistance, as did ABA INSENSITIVE-1 or REDOX RESPONSIVE TRANSCRIPTION FACTOR1. The decrease in aphid fecundity observed in mutants defective in ascorbate accumulation (vtc2) was absent from abi4vtc2 double mutants that are also deficient in ABA signaling (abi4). Aphid-dependent transcriptome responses reveal a role for ascorbate-regulated receptor-like kinases in plant defenses against aphids. Innovation: Vitamin C deficiency enhances plant resistance to aphids through redox signalling pathways rather than dietary requirements. Conclusion: ABI4 is a linchpin of redox regulation of the innate immune response to aphids.
Authors:
Pavel I Kerchev; Barbara Karpinska; Jenny A Morris; Akila Hussain; Susan R Verrall; Peter E Hedley; Brian Fenton; Christine Helen Foyer; Robert Douglas Hancock
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2013-1-23
Journal Detail:
Title:  Antioxidants & redox signaling     Volume:  -     ISSN:  1557-7716     ISO Abbreviation:  Antioxid. Redox Signal.     Publication Date:  2013 Jan 
Date Detail:
Created Date:  2013-1-24     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  100888899     Medline TA:  Antioxid Redox Signal     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
University of Leeds, Centre for Plant Sciences, Leeds, United Kingdom; paker@psb.vib-ugent.be.
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