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Effects of phytohormones on the surfaces of plant-parasitic nematodes

Published online by Cambridge University Press:  16 January 2003

A. AKHKHA ,
J. KUSEL ,
M. KENNEDY  and
R. CURTIS
A. AKHKHA
Affiliation:
Davidson Building, Division of Biochemistry and Molecular Biology, University of Glasgow, Glasgow G12 8QQ, UK
J. KUSEL
Affiliation:
Davidson Building, Division of Biochemistry and Molecular Biology, University of Glasgow, Glasgow G12 8QQ, UK
M. KENNEDY
Affiliation:
Graham Kerr Building, Division of Environmental and Evolutionary Biology, University of Glasgow, Glasgow G12 8QQ, UK
R. CURTIS
Affiliation:
IACR-Rothamsted, Harpenden, Hertfordshire AL5 2JQ, UK
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Abstract

The direct effects of phytohormones (auxin and kinetin) and root diffusates on the surface lipophilicity of the plant parasitic nematodes Globodera rostochiensis and Meloidogyne incognita were investigated. The fluorescent lipid probe AF18 (5-N-(octodecanoyl) aminofluorescein) was used to detect surface changes. Root diffusates increased AF18 uptake by G. rostochiensis while it had no effect on M. incognita. Kinetin and auxin decreased AF18 uptake in G. rostochiensis, while they had the opposite effect on M. incognita. Auxin/kinetin ratio was also found to be important in triggering the surface changes, especially at high concentrations. Whether plant nematodes have auxin and/or kinetin binding proteins is discussed as well as the mechanism behind the surface lipophilicity changes due to root diffusates and phytohormones.

Keywords

nematodesMeloidogyne incognitaGlobodera rostochiensisauxinscytokininsfluorescent lipid probes
Type
Original Article
Information
Parasitology , Volume 125 , Issue 2 , August 2002 , pp. 165 - 175
Copyright
2002 Cambridge University Press

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