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Is leaf or sheath antibiosis involved in the resistance of maize composite EPS12 to Sesamia nonagrioides?

Published online by Cambridge University Press:  02 April 2012

A. Butrón ,
B. Ordás ,
P. Revilla ,
G. Sandoya ,
A. Ordás  and
R.A. Malvar
A. Butrón*
Affiliation:
Misión Biológica de Galicia, Spanish Council for Scientific Research, Apartado 28, 36080 Pontevedra, Spain
B. Ordás
Affiliation:
Misión Biológica de Galicia, Spanish Council for Scientific Research, Apartado 28, 36080 Pontevedra, Spain
P. Revilla
Affiliation:
Misión Biológica de Galicia, Spanish Council for Scientific Research, Apartado 28, 36080 Pontevedra, Spain
G. Sandoya
Affiliation:
Misión Biológica de Galicia, Spanish Council for Scientific Research, Apartado 28, 36080 Pontevedra, Spain
A. Ordás
Affiliation:
Misión Biológica de Galicia, Spanish Council for Scientific Research, Apartado 28, 36080 Pontevedra, Spain
R.A. Malvar
Affiliation:
Misión Biológica de Galicia, Spanish Council for Scientific Research, Apartado 28, 36080 Pontevedra, Spain
*
1Corresponding author (e-mail: abutron@mbg.cesga.es).
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Abstract

The pink stem borer (PSB) (Sesamia nonagrioides Lefèbvre, 1827; Lepidoptera: Noctuidae) is the main insect pest of maize (Zea mays L., Poaceae) in the Mediterranean area. Maize varieties partially resistant to PSB have been identified, but few studies have documented the mechanisms of resistance involved. The objectives of this research were to study the levels of leaf and sheath antibiosis of a maize population, EPS12, and determine whether antibiosis improved over the selection process for less stalk tunneling. A hybrid check and two Bacillus thuringiensis (Bt) hybrids were also examined. Several bioassays were carried out in a control chamber to evaluate antibiosis of maize leaves and sheaths against PSB larvae. Leaf antibiosis was significantly higher for EPS12 than for the hybrid check and sheath antibiosis was low for all non-Bt hybrids studied. We conclude that leaf and sheath antibiosis was not significantly improved during the selection process. Future efforts should look for other possible mechanisms of resistance, such as stem rind antibiosis.

Résumé

La sésamie du maïs (PSB; Sesamia nonagrioides Lefèbvre, 1827; Lepidoptera: Noctuidae) est le principal insecte ravageur du maïs (Zea mays L., Poaceae) de la région méditerranéenne. Des variétés de maïs partiellement résistantes à la sésamie (PSB) ont été identifiées, bien que peu d'études aient abordé les mécanismes de résistance impliqués. Les objectifs de notre recherche consistent à étudier l'antibiose au niveau des feuilles et de la gaine d'une population de maïs EPS12 et de vérifier s'il y a amélioration de l'antibiose lorsque nous faisons une sélection pour diminuer le taux de perçage des tiges. Nous avons aussi testé un témoin commercial hybride et deux hybrides Bt (Bacillus thuringiensis). Nous avons procédé à plusieurs bioessais dans des chambres de culture contrôlées afin de vérifier l'antibiose des feuilles et des gaines de maïs aux larves de sésamie (PSB). L'antibiose des feuilles est significativement plus élevée chez EPS12 que chez le témoin commercial hybride et celle des gaines est faible chez toutes les variétés non Bt étudiées. En conclusion, le processus de sélection n'améliore pas significativement l'antibiose des feuilles et des gaines. Les études futures devraient rechercher d'autres mécanismes de résistance, tels que l'antibiose du cortex de la tige.

[Traduit par la Rédaction]

Type
Articles
Information
The Canadian Entomologist , Volume 137 , Issue 3 , June 2005 , pp. 350 - 355
Copyright
Copyright © Entomological Society of Canada 2005

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