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Phase-related morphological changes induced by [His7]-corazonin in two species of locusts, Schistocerca gregaria and Locusta migratoria (Orthoptera: Acrididae)

Published online by Cambridge University Press:  09 March 2007

K. Maeno ,
T. Gotoh  and
S. Tanaka
K. Maeno
Affiliation:
Laboratory of Insect Life Cycles and Physiology, Division of Insect and Animal Sciences, NIAS Independent Administrative Institution, Ohwashi 1-2, Tsukuba, Ibaraki 305-8634, Japan Laboratroy of Applied Entomology and Zoology, Faculty of Agriculture, Ibaraki University, Ibaraki 300-0393, Japan
T. Gotoh
Affiliation:
Laboratroy of Applied Entomology and Zoology, Faculty of Agriculture, Ibaraki University, Ibaraki 300-0393, Japan
S. Tanaka*
Affiliation:
Laboratory of Insect Life Cycles and Physiology, Division of Insect and Animal Sciences, NIAS Independent Administrative Institution, Ohwashi 1-2, Tsukuba, Ibaraki 305-8634, Japan
*
*Fax: +81 (0)29 838 6110 E-mail: [email protected]
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Abstract

The effects of a neurohormone, [His7]-corazonin, on phase-related morphological traits (F/C and E/F ratios; F = length of the hind femur, C = maximum width of the head; E = length of fore wing) were re-examined in the desert locust, Schistocerca gregaria Forskål. The F/C ratio was significantly different between adults with five and six nymphal instars, respectively, indicating that they need to be analysed separately. Injections of the synthesized peptide (1 nmol) into individually-reared (solitary) nymphs at the second and third instars caused a shift in classical morphometric ratio towards the value typical for crowded (gregarious) individuals in both sexes. The E/F ratio, which is smaller in solitary locusts than in gregarious ones, was also influenced significantly by injections of [His7]-corazonin into individually-reared locusts. The effect of [His7]-corazonin on E/F ratios was shown more clearly when the nymphs were injected at a higher dose (2 nmol) at the beginning of the third instar. Single injections of the peptide into individually-reared nymphs at different instars revealed that the earlier the injection the larger the ‘gregarizing’ effects of the peptide on F/C and E/F ratios. The same tendency was also detected in Locusta migratoria Linnaeus. These results supported the hypothesis that [His7]-corazonin plays an important role in the control of phase polymorphism in locusts.

Type
Research Article
Information
Bulletin of Entomological Research , Volume 94 , Issue 4 , August 2004 , pp. 349 - 357
Copyright
Copyright © Cambridge University Press 2004

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