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PMID: 17189328 Published · ppublish English Journal Article Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, Non-P.H.S.

Silverleaf whitefly induces salicylic acid defenses and suppresses effectual jasmonic acid defenses.

Plant physiology ·Vol. 143 ·No. 2 ·2007-02-00 ·Pages 866-75

Zarate SI, Kempema LA, Walling LL

Abstract

The basal defenses important in curtailing the development of the phloem-feeding silverleaf whitefly (Bemisia tabaci type B; SLWF) on Arabidopsis (Arabidopsis thaliana) were investigated. Sentinel defense gene RNAs were monitored in SLWF-infested and control plants. Salicylic acid (SA)-responsive gene transcripts accumulated locally (PR1, BGL2, PR5, SID2, EDS5, PAD4) and systemically (PR1, BGL2, PR5) during SLWF nymph feeding. In contrast, jasmonic acid (JA)- and ethylene-dependent RNAs (PDF1.2, VSP1, HEL, THI2.1, FAD3, ERS1, ERF1) were repressed or not modulated in SLWF-infested leaves. To test for a role of SA and JA pathways in basal defense, SLWF development on mutant and transgenic lines that constitutively activate or impair defense pathways was determined. By monitoring the percentage of SLWF nymphs in each instar, we show that mutants that activate SA defenses (cim10) or impair JA defenses (coi1) accelerated SLWF nymphal development. Reciprocally, mutants that activate JA defenses (cev1) or impair SA defenses (npr1, NahG) slowed SLWF nymphal development. Furthermore, when npr1 plants, which do not activate downstream SA defenses, were treated with methyl jasmonate, a dramatic delay in nymph development was observed. Collectively, these results showed that SLWF-repressed, JA-regulated defenses were associated with basal defense to the SLWF.

MeSH Terms
Animals Arabidopsis/metabolism,parasitology Cyclopentanes/metabolism Ethylenes/metabolism Feeding Behavior/physiology Female Gene Expression Profiling Gene Expression Regulation, Plant Hemiptera/physiology Larva/physiology Male Oxylipins Salicylic Acid/metabolism Signal Transduction
Chemicals
Cyclopentanes Ethylenes Oxylipins jasmonic acid ethylene Salicylic Acid
Authors & Affiliations
3 authors, click to expand affiliations / ORCID
Zarate Sonia I
Department of Botany and Plant Sciences, Center for Plant Cell Biology, University of California, Riverside, California 92521-0124, USA.
Kempema Louisa A
Walling Linda L
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Article Info
Journal
Plant physiology
Abbr.
Plant Physiol
ISSN
0032-0889
DOI
10.1104/pp.106.090035
Published
2007-02-00
Epub
2006-00-22
Pages
866-75
Language
English
Region
United States
NLM ID
0401224
PMCID
PMC1803729
Subset
IM
External Links
PubMed source DOI: 10.1104/pp.106.090035 PMC Full Text View journal details
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