Document Detail

Differential accumulation of phytohormones in wheat seedlings attacked by avirulent and virulent Hessian fly (Diptera: Cecidomyiidae) larvae.
MedLine Citation:
PMID:  20214384     Owner:  NLM     Status:  MEDLINE    
We analyzed the accumulation of six phytohormones and phytohormone-related compounds in a wheat, Triticum aestivium L., genotype, 'Molly', after attacks by avirulent and virulent Hessian fly, Mayetiola destructor (Say) (Diptera: Cecidomyiidae), larvae, respectively, and we examined the expression of genes in the jasmonic acid (JA) pathway by Northern blot analysis. Compared with uninfested plants, attacks by avirulent larvae resulted in increased accumulation of salicylic acid (SA) by 11.3- and 8.2-fold, 12-oxo-phytodienoic acid (OPDA) by 36.4-and 18.7-fold, 18:3 fatty acid by 4.5- and 2.2-fold, and 18:1 fatty acid by 1.8- and 1.9-fold at 24 and 72 h post-initial attack (hpia), respectively, but an 20% decrease in JA accumulation at 24 hpia at the attack site. Attacks by the virulent larvae did not affect the accumulation of SA, OPDA, and 18:3 and 18:1 fatty acids but dramatically increased the concentration of auxin (AUX) from undetectable in uninfested plants to 381.7 ng/g fresh weight at 24 hpia and 71.0 ng/g fresh weight at 72 hpia in infested plants. Transcript levels of genes encoding lipoxygenase 2, allene oxide synthase, and Arabidopsis storage protein 2 were increased after avirulent larval attacks but decreased after virulent larval attacks. Our results suggest that OPDA and SA may act together in wheat resistance to the Hessian fly, whereas AUX may play a role in the susceptibility of wheat plants. The increased OPDA accumulation after avirulent larval attacks was at least partially regulated through gene transcription.
Lieceng Zhu; Xiang Liu; Ming-Shun Chen
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Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural    
Journal Detail:
Title:  Journal of economic entomology     Volume:  103     ISSN:  0022-0493     ISO Abbreviation:  J. Econ. Entomol.     Publication Date:  2010 Feb 
Date Detail:
Created Date:  2010-03-10     Completed Date:  2010-04-05     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  2985127R     Medline TA:  J Econ Entomol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  178-85     Citation Subset:  IM    
Department of Natural Science, Fayetteville State University, Fayetteville, NC 28301, USA.
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MeSH Terms
Diptera / pathogenicity*
Gene Expression Regulation, Plant / physiology
Larva / pathogenicity
Plant Growth Regulators / metabolism*
Plant Proteins / genetics,  metabolism
Seedling / metabolism*,  parasitology*
Triticum / metabolism*,  parasitology*
Grant Support
Reg. No./Substance:
0/Plant Growth Regulators; 0/Plant Proteins

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