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EFFECT OF LIGHT ON CHANGES IN MAIZE RESISTANCE AGAINST THE EUROPEAN CORN BORER, OSTRINIA NUBILALIS (HÜBNER)

Published online by Cambridge University Press:  31 May 2012

D.J. Bergvinson
Affiliation:
Department of Biology, University of Ottawa, Ottawa, Ontario, Canada K1N 6N5
J.S. Larsen
Affiliation:
Department of Biology, University of Ottawa, Ottawa, Ontario, Canada K1N 6N5
J.T. Arnason
Affiliation:
Department of Biology, University of Ottawa, Ottawa, Ontario, Canada K1N 6N5

Abstract

The herbivore-resistant synthetic maize BS9 (C4) was grown in three environments, namely, greenhouse with reduced UV light, greenhouse with supplemental UV light, and outside, and leaves at the three-, five-, seven-, nine-, and 10-leaf stages of development were fed to the European corn borer, Ostrinia nubilalis (Hübner). Larvae preferred younger leaves, and leaves grown under reduced UV light, in spite of the high levels of the defence compound 2,4-dihydroxy-7-methoxy-2H-1,4 benzoxazin-3 (4H)-one (DIMBOA). The low level of feeding on leaves from plants grown outside was associated with increased toughness and increased photochemically derived phenolic dimers that cross-link hemicellulose. Tender young maize plants have a low level of cell wall phenolics and depend on a toxin (DIMBOA) for defence. In older plants, DIMBOA levels are low, leaves are tough, and resistance is largely structure-based.

Résumé

Du maïs synthétique résistant aux herbivores, BS9 (C4), a été cultivé dans trois milieux différents, une serre à éclairage UV réduit, une serre à éclairage UV augmenté et une terre à l’extérieur et des feuilles de ces cultures aux stades trois, cinq, sept, neuf et 10 feuilles ont été données en nourriture à des Vers de l’épi de maïs, Ostrinia nubilalis (Hübner). Les larves ont montré une préférence pour les jeunes feuilles et pour les feuilles de la serre à éclairage UV réduit, en dépit des concentrations élevées du composé de défense 2,4-dihydroxy-7-méthoxy-2H-1,4 benzoxazin-3 (4H)-one (DIMBOA) dans les plantes. La faible consommation de feuilles des plant cultivés à l’extérieur était reliée à leur rigidité accrue et à l’augmentation de la concentration de dimères phénoliques, générés par photochimie, qui se lient à l’hémicellulose. Les jeunes plants tendres de maïs ont une faible concentration de produits phénolés dans leurs parois cellulaires et une toxine (DIMBOA) assure leur résistance. Chez les plants plus âgés, les concentrations de DIMBOA sont faibles, les feuilles sont coriaces et la résistance est surtout due à des facteurs structuraux.

[Traduit par la Rédaction]

Type
Articles
Copyright
Copyright © Entomological Society of Canada 1995

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