NDLI: Micro-Evolution in Grasshoppers Mediated by Polymorphic Robertsonian Translocations

Content Provider	PubMed Central
Author	Colombo, Pablo C.
Copyright Year	2013
Abstract	This review focuses on grasshoppers that are polymorphic for Robertsonian translocations because in these organisms the clarity of meiotic figures allows the study of both chiasma distribution and the orientation of trivalents and multivalents in metaphase I. Only five species of such grasshoppers were found in the literature, and all of them were from the New World: Oedaleonotus enigma (Scudder) (Orthoptera: Acrididae), Leptysma argentina Bruner, Dichroplus pratensis Bruner, Sinipta dalmani Stål, and Cornops aquaticum Bruner. A general feature of these species (except O. enigma) is that fusion carriers suffer a marked reduction of proximal and interstitial (with respect to the centromere) chiasma frequency; this fact, along with the reduction in the number of linkage groups with the consequent loss of independent segregation, produces a marked decrease of recombination in fusion carriers. This reduction in recombination has led to the conclusion that Robertsonian polymorphic grasshopper species share some properties with inversion polymorphic species of Drosophila, such as the central-marginal pattern (marginal populations are monomorphic, central populations are highly polymorphic). This pattern might be present in D. pratensis, which is certainly the most complex Robertsonian polymorphism system in the present study. However, L. argentina and C. aquaticum do not display this pattern. This issue is open to further research. Since C. aquaticum is soon to be released in South Africa as a biological control, the latitudinal pattern found in South America may repeat there. This experiment's outcome is open and deserves to be followed.
Related Links	http://dx.doi.org/10.1673/031.013.4301
Starting Page	43
File Format	PDF
ISSN	15362442
e-ISSN	15362442
Journal	Journal of Insect Science
Volume Number	13
Language	English
Publisher	University of Wisconsin Library
Publisher Date	2013-05-01
Access Restriction	Open
Rights Holder	University of Wisconsin Library
Subject Keyword	Insect Science Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Medicine Insect Science

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