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Kairomones as pigeonpea resistance factors against Heliothis armigera

Published online by Cambridge University Press:  19 September 2011

Heinz Rembold  and
Hans Tober
Heinz Rembold
Affiliation:
Max-Planck Institute for Biochemistry, D-8033 Martinsried, nr Munich, FRG
Hans Tober
Affiliation:
Max-Planck Institute for Biochemistry, D-8033 Martinsried, nr Munich, FRG
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Abstract

The differential attraction by 2 pigeonpea cultivars has been tested through the oviposition behaviour of Heliothis armigera females in a standardized laboratory assay. Seedlings of a susceptible variety (PPE-50) are under choice conditions significantly more attractive at a distance, and without contact allowed other than those of the resistant variety (PPE-45). The volatile signal is contained in the hexane extract from PPE-50 leaves, as shown in the oviposition assay, and after vacuum distillation is present in the more volatile fractions of the mono- and sesquiterpenoids. These compounds, which are also contained in the hexane extracts of 2 more pigeonpea cultivars, a check of medium susceptibility (T-21) and a wild relative (Atylosia scarabaeoides), were compared by capillary gas chromatography. The 4 pigeonpea varieties were characterized by their specific aromagrams, a method which may also advantageously be used in pigeonpea breeding programs.

Résumé

L'attraction différentielle par deux cultivars de petits pois (pigeon pea) a été testée à travers le comportement quant à l'oviposition des Heliothis armigera femelles dans un essai standardizé de laboratoire. Des jeunes plantes d'une variété susceptible (PPE-50) sont considérablement plus attrayants à distance dans des conditions de choix que ceux de la variété résistante (PPE-45). Le signal volatile était contenu dans l'hexane extrait des feuilles du PPE-50 comme il a été montré dans l'essai d'oviposition, et après la distillation à vide il était, présent dans les fractions plus volatiles du mono et sesquiterpenoides. Ces composés qui sont contenus dans les extraits d'hexane de deux cultivars de petits pois supplementaires; un contrôle susceptibilité moyenne (T-21) et une variété sauvage (Atylosia scarabaloides) ont été comparés par Chromatographie capillaire à gas. Les quatre variétés de petits pois étaient charactérisées par leurs aromagrammes spécifiques, une méthode qui peut être employée advantageusement dans les programmes de culture de petits pos (pigeon pea).

Keywords

Heliothis armigeraCajanus cajanpigeonpeakairomoneoviposition attractantaromagramterpenesHeliothis armigeraCajanus cajanpetit pois (pigeon pea)kairomoneovipositionaroma-gramme
Type
Section I: Types and mechanisms of host plant resistance
Information
International Journal of Tropical Insect Science , Volume 6 , Special Issue 3: Host Plant Resistance and its Significance in Pest Management , June 1985 , pp. 249 - 252
Copyright
Copyright © ICIPE 1985

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References

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