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Phytoecdysteroids: A Novel Defense Against Plant-Parasitic Nematodes

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Abstract

The phytoecdysteroid, 20-hydroxyecdysone (20E), is a major molting hormone of invertebrates possibly including nematodes. As 20E is inducible in spinach, the defensive role against plant-parasitic nematodes was investigated. The effects of direct application on nematodes was assessed by treating cereal cyst nematode, Heterodera avenae, juveniles with concentrations of 20E from 8.2 × 10−8 to 5.2 × 10−5 M before applying to Triticum aestivum growing in sand. H. avenae, Heterodera schachtii (sugarbeet cyst nematode), Meloidogyne javanica (root-knot nematode) and Pratylenchus neglectus (root lesion nematode) were treated with 5.2 × 10−5 20E and incubated in moist sand. To test the protective effects of 20E in plants, the latter three nematodes were applied to Spinacia oleracea in which elevated concentrations of 20E had been induced by methyl jasmonate. Abnormal molting, immobility, reduced invasion, impaired development, and death occurred in nematodes exposed to 20E either directly at concentration above 4.2 × 10−7 M or in plants. Phytoecdysteroid was found to protect spinach from plant-parasitic nematodes and may confer a mechanism for nematode resistance.

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Authors and Affiliations

  1. Plant and Pest Science, School of Agriculture and Wine, University of Adelaide, PMB1 Glen Osmond, SA 5064, Australia

    Imelda R. Soriano, Ian T. Riley & Mark J. Potter

  2. Department of Entomology, University of Arizona, Tucson, Arizona, 85721, USA

    William S. Bowers

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  1. Imelda R. Soriano
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  2. Ian T. Riley
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  3. Mark J. Potter
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  4. William S. Bowers
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Soriano, I.R., Riley, I.T., Potter, M.J. et al. Phytoecdysteroids: A Novel Defense Against Plant-Parasitic Nematodes. J Chem Ecol 30, 1885–1899 (2004). https://doi.org/10.1023/B:JOEC.0000045584.56515.11

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