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United States Department of Agriculture

Agricultural Research Service

Research Project: MANAGEMENT OF INVASIVE SCARABS, ROOT WEEVILS, AND OTHER BEETLES OF QUARANTINE SIGNIFICANCE IN HORTICULTURAL, TURF, AND NURSERY CROPS

Location: Application Technology Research Unit

Title: Influence of Silicon on Resistance of Zinnia Elegans to Myzus Persicae (Hemiptera: Aphididae)

Authors
item RANGER, CHRISTOPHER
item Singh, Ajay - RUTGERS UNIVRSITY
item Frantz, Jonathan
item Canas, Luis - OHIO STATE UNIVERSITY
item LOCKE, JAMES
item REDING, MICHAEL
item Vorsa, Nicholi -

Submitted to: Environmental Entomology
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: January 15, 2008
Publication Date: March 25, 2009
Repository URL: http://hdl.handle.net/10113/28153
Citation: Ranger, C.M., Singh, A.P., Frantz, J., Canas, L., Locke, J.C., Reding, M.E., Vorsa, N. 2009. Influence of Silicon on Resistance of Zinnia Elegans to Myzus Persicae (Hemiptera: Aphididae). Environmental Entomology. 38:129-136.

Interpretive Summary: Studies were conducted to examine the effect of treating Zinnia elegans Jacq. with soluble silicon on the performance of the green peach aphid, Myzus persicae (Sulzer). Zinnia elegans plants were irrigated with a nutrient solution amended with potassium silicate (K2SiO2), or a nutrient solution without K2SiO2. Aphid developmental rates and survivorship were not affected by K2SiO2 treatment, but offspring production and the intrinsic rate of increase (rm) were slightly reduced on Z. elegans plants receiving soluble silicon. Quantification of silicon content in leaf tissues confirmed significantly higher silicon concentrations in plants treated with K2SiO2 compared to control plants. Plant defensive phenolics were also quantified from Z. elegans. Compared to control plants, only slight elevations in 5-caffeoylquinic acid, p-coumaroylquinic acid and rutin were detected in leaves of Z. elegans plants treated with K2SiO2. Similarly, a slight elevation in plant defensive enzymes was detected in plants treated with K2SiO2. Overall, these results indicate treatment of Z. elegans with soluble silicon provides a modest increase in resistance levels to M. persicae, which may be due in part to defense-related compounds.

Technical Abstract: Studies were conducted to examine the effect of treating Zinnia elegans Jacq. with soluble silicon on the performance of the green peach aphid, Myzus persicae (Sulzer). Zinnia elegans plants were irrigated every 2 days throughout the duration of the experiment with a nutrient solution amended with potassium silicate (K2SiO2), or a nutrient solution without K2SiO2. Length of the prereproductive period and survivorship of M. persicae were not affected by K2SiO2 treatment, but total cumulative fecundity and the intrinsic rate of increase (rm) were slightly reduced on Z. elegans plants receiving soluble silicon. Quantification of silicon content in leaf tissues using inductively coupled plasma optical emission spectroscopy (ICP-OES) confirmed significantly higher silicon concentrations in plants treated with K2SiO2 compared to control plants. High performance liquid chromatography-mass spectrometry (HPLC-MS) analysis was used to identify and quantify phenolic acids and flavonols in leaf tissue of Z. elegans. Compared to control plants, only slight elevations in 5-caffeoylquinic acid, p-coumaroylquinic acid and rutin were detected in leaves of Z. elegans plants treated with K2SiO2. Similarly, a slight elevation in guaiacol peroxidase activity was detected in plants treated with K2SiO2. Overall, these results indicate treatment of Z. elegans with soluble silicon provides a modest increase in resistance levels to M. persicae, which may be due in part to defense-related compounds.

Last Modified: 7/28/2014
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