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Strong biases in the transmission of sex chromosomes in the aphid Rhopalosiphum padi

Published online by Cambridge University Press:  23 June 2005

ADRIEN FRANTZ
Affiliation:
UMR INRA/Agrocampus Rennes ‘Biologie des Organismes et des Populations appliquée à la Protection des Plantes’ (BiO3P), BP 35327 – Domaine de la Motte-au-Vicomte, 35653 Le Rheu Cedex, France
MANUEL PLANTEGENEST
Affiliation:
UMR INRA/Agrocampus Rennes ‘Biologie des Organismes et des Populations appliquée à la Protection des Plantes’ (BiO3P), BP 35327 – Domaine de la Motte-au-Vicomte, 35653 Le Rheu Cedex, France
JOËL BONHOMME
Affiliation:
UMR INRA/Agrocampus Rennes ‘Biologie des Organismes et des Populations appliquée à la Protection des Plantes’ (BiO3P), BP 35327 – Domaine de la Motte-au-Vicomte, 35653 Le Rheu Cedex, France
NATHALIE PRUNIER-LETERME
Affiliation:
UMR INRA/Agrocampus Rennes ‘Biologie des Organismes et des Populations appliquée à la Protection des Plantes’ (BiO3P), BP 35327 – Domaine de la Motte-au-Vicomte, 35653 Le Rheu Cedex, France
JEAN-CHRISTOPHE SIMON
Affiliation:
UMR INRA/Agrocampus Rennes ‘Biologie des Organismes et des Populations appliquée à la Protection des Plantes’ (BiO3P), BP 35327 – Domaine de la Motte-au-Vicomte, 35653 Le Rheu Cedex, France
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Abstract

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The typical life cycle of aphids involves several parthenogenetic generations followed by a single sexual one in autumn, i.e. cyclical parthenogenesis. Sexual females are genetically identical to their parthenogenetic mothers and carry two sex chromosomes (XX). Male production involves the elimination of one sex chromosome (to produce X0) that could give rise to genetic conflicts between X-chromosomes. In addition, deleterious recessive mutations could accumulate on sex chromosomes during the parthenogenetic phase and affect males differentially depending on the X-chromosome they inherit. Genetic conflicts and deleterious mutations thus may induce transmission bias that could be exaggerated in males. Here, the transmission of X-chromosomes has been studied in the laboratory in two cyclically parthenogenetic lineages of the bird cherry-oat aphid Rhopalosiphum padi. X-chromosome transmission was followed, using X-linked microsatellite loci, at male production in the two lineages and in their hybrids deriving from reciprocal crosses. Genetic analyses revealed non-Mendelian inheritance of X-chromosomes in both parental and hybrid lineages at different steps of male function. Putative mechanisms and evolutionary consequences of non-Mendelian transmission of X-chromosomes to males are discussed.

Type
Research Article
Copyright
© 2005 Cambridge University Press