Abstract
A chiasma distribution study in diplotene in the grasshopper Leptysma argentina revealed that: (i) chiasma interference plays a central role in determining chiasma distribution in bivalents carrying two or more chiasmata in this species; (ii) the distance of interference (i) increases significantly in fusion carriers, and this effect is additive (is more pronounced in fusion homozygotes than in heterozygotes). This increase is due to a genuine intensification of chiasma interference; (iii) chiasma interference is operative across the centromere; and (iv) across-centromere interference is also influenced by the karyotype, in the same fashion as non trans-centromeric interference. Finally, a discussion concerning the possible origin of the fusion 3/6 polymorphism is held.
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Acknowledgements
I wish to express my gratitude to Dr J. C. Vilardi, who kindly suggested this work and criticized several flaws in the manuscript; to my colleagues Drs Viviana Confalonieri and Isabel Remis for helpful discussions and valuable suggestions, to Prof. Dr Juan H. Hunziker for encouragement and critical reading of the manuscript and to the National Board of Natural Parks (Direccion Nacional de Parques Naturales, Argentina) for allowing sample collection in the National Park ?1 Palmar'. The taxonomical identification of the material was made by the entomologist Dr Ricardo Ronderos, to whom the author is very grateful. The author is also grateful to the anonymous reviewers whose criticisms improved the manuscript. Financial support from the Consejo Nacional de Investigaciones Cientificas y Tecnicas (CONICET) and the Subsecretaria de Ciencia y Tecnica is gratefully acknowledged.
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Colombo, P. A polymorphic centric fusion enhances chiasma interference in Leptysma argentina (Orthoptera): a chiasma distribution study. Heredity 70, 254–265 (1993). https://doi.org/10.1038/hdy.1993.37
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DOI: https://doi.org/10.1038/hdy.1993.37
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