Micro-evolution in grasshoppers mediated by polymorphic Robertsonian translocations
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 w...
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todo:paper_15362442_v13_n_p_Colombo2023-10-03T16:21:52Z Micro-evolution in grasshoppers mediated by polymorphic Robertsonian translocations Colombo, P.C. Chiasma frequency Environmental gradient Grasshoppers Microevolution Recombination Robertsonian polymorphisms Acrididae Caelifera Cornops aquaticum Dichroplus pratensis Leptysma argentina Oedaleonotus enigma Orthoptera Robertsonia Sinipta dalmani animal Caelifera evolution gene translocation genetic polymorphism genetics hybridization insect chromosome meiosis Caelifera genetics review Animals Biological Evolution Chromosomes, Insect Grasshoppers Hybridization, Genetic Meiosis Polymorphism, Genetic Translocation, Genetic Animals Biological Evolution Chromosomes, Insect Grasshoppers Hybridization, Genetic Meiosis Polymorphism, Genetic Translocation, Genetic 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. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_15362442_v13_n_p_Colombo |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Chiasma frequency Environmental gradient Grasshoppers Microevolution Recombination Robertsonian polymorphisms Acrididae Caelifera Cornops aquaticum Dichroplus pratensis Leptysma argentina Oedaleonotus enigma Orthoptera Robertsonia Sinipta dalmani animal Caelifera evolution gene translocation genetic polymorphism genetics hybridization insect chromosome meiosis Caelifera genetics review Animals Biological Evolution Chromosomes, Insect Grasshoppers Hybridization, Genetic Meiosis Polymorphism, Genetic Translocation, Genetic Animals Biological Evolution Chromosomes, Insect Grasshoppers Hybridization, Genetic Meiosis Polymorphism, Genetic Translocation, Genetic |
| spellingShingle |
Chiasma frequency Environmental gradient Grasshoppers Microevolution Recombination Robertsonian polymorphisms Acrididae Caelifera Cornops aquaticum Dichroplus pratensis Leptysma argentina Oedaleonotus enigma Orthoptera Robertsonia Sinipta dalmani animal Caelifera evolution gene translocation genetic polymorphism genetics hybridization insect chromosome meiosis Caelifera genetics review Animals Biological Evolution Chromosomes, Insect Grasshoppers Hybridization, Genetic Meiosis Polymorphism, Genetic Translocation, Genetic Animals Biological Evolution Chromosomes, Insect Grasshoppers Hybridization, Genetic Meiosis Polymorphism, Genetic Translocation, Genetic Colombo, P.C. Micro-evolution in grasshoppers mediated by polymorphic Robertsonian translocations |
| topic_facet |
Chiasma frequency Environmental gradient Grasshoppers Microevolution Recombination Robertsonian polymorphisms Acrididae Caelifera Cornops aquaticum Dichroplus pratensis Leptysma argentina Oedaleonotus enigma Orthoptera Robertsonia Sinipta dalmani animal Caelifera evolution gene translocation genetic polymorphism genetics hybridization insect chromosome meiosis Caelifera genetics review Animals Biological Evolution Chromosomes, Insect Grasshoppers Hybridization, Genetic Meiosis Polymorphism, Genetic Translocation, Genetic Animals Biological Evolution Chromosomes, Insect Grasshoppers Hybridization, Genetic Meiosis Polymorphism, Genetic Translocation, Genetic |
| description |
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. |
| format |
JOUR |
| author |
Colombo, P.C. |
| author_facet |
Colombo, P.C. |
| author_sort |
Colombo, P.C. |
| title |
Micro-evolution in grasshoppers mediated by polymorphic Robertsonian translocations |
| title_short |
Micro-evolution in grasshoppers mediated by polymorphic Robertsonian translocations |
| title_full |
Micro-evolution in grasshoppers mediated by polymorphic Robertsonian translocations |
| title_fullStr |
Micro-evolution in grasshoppers mediated by polymorphic Robertsonian translocations |
| title_full_unstemmed |
Micro-evolution in grasshoppers mediated by polymorphic Robertsonian translocations |
| title_sort |
micro-evolution in grasshoppers mediated by polymorphic robertsonian translocations |
| url |
http://hdl.handle.net/20.500.12110/paper_15362442_v13_n_p_Colombo |
| work_keys_str_mv |
AT colombopc microevolutioningrasshoppersmediatedbypolymorphicrobertsoniantranslocations |
| _version_ |
1782025512241070080 |