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The inheritance of life-cycle differences in Myzus persicae (Sulz.) (Hem., Aphididae)

Published online by Cambridge University Press:  10 July 2009

R. L. Blackman
R. L. Blackman
Affiliation:
Imperial College Field Station, Silwood Park, Ascot, Berkshire, England.
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Extract

The response to short photoperiod (10 h) of the F1 and F2 sexual generations of Myzus persicae (Sulz.) resulting from a cross between oviparae from a holocyclic clone and males from an androcyclic clone were examined and compared in experiments done at Imperial College Field Station, England. F1 and F2 progeny segregated into three distinct phenotypes; holocyclic, androcyclic and intermediate. Intermediate clones reared at 10 h photoperiod produced alatae which were physiologically intermediate between gynoparae and virginoparae, because their progeny consisted of oviparae, apterous virginoparae and intermorphs. Intermediacy was not affected by temperature and seems to be genetically determined. Segregation ratios in the F1 and F2 indicate that the androcyclic condition is induced by a recessive ‘ switch-gene ’ which completely suppresses the production of sexual females, and partially suppresses male production. This gene could be present in the heterozygous condition in a large proportion of parthenogenetic lines of the aphid, and thus confer a latent potentiality for anholocycly on populations even where conditions will not regularly permit this method of overwintering. Conversely where anholocycly is strongly favoured many aphids would be homozygous for the recessive, androcyclic character, but the potential for gamic reproduction could remain widespread.

Type
Research Paper
Information
Bulletin of Entomological Research , Volume 62 , Issue 2 , November 1972 , pp. 281 - 294
Copyright
Copyright © Cambridge University Press 1972

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