Reproductive isolation due to the genetic incompatibilities between Thrichomys pachyurus and two subspecies of Thrichomys apereoides (Rodentia, Echimyidae)
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作者:
Borodin, PM
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Inst Oswaldo Cruz, Dept Trop Med, BR-20001 Rio De Janeiro, BrazilInst Oswaldo Cruz, Dept Trop Med, BR-20001 Rio De Janeiro, Brazil
Borodin, PM
[1
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Barreiros-Gomez, SC
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机构:Inst Oswaldo Cruz, Dept Trop Med, BR-20001 Rio De Janeiro, Brazil
Barreiros-Gomez, SC
Zhelezova, AI
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机构:Inst Oswaldo Cruz, Dept Trop Med, BR-20001 Rio De Janeiro, Brazil
Zhelezova, AI
Bonvicino, CR
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机构:Inst Oswaldo Cruz, Dept Trop Med, BR-20001 Rio De Janeiro, Brazil
Bonvicino, CR
D'Andrea, PS
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机构:Inst Oswaldo Cruz, Dept Trop Med, BR-20001 Rio De Janeiro, Brazil
D'Andrea, PS
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[1] Inst Oswaldo Cruz, Dept Trop Med, BR-20001 Rio De Janeiro, Brazil
We tested intrinsic reproductive isolation between 3 taxa of the South American caviomorph rodent Thrichomys (Rodentia, Echimyidae): T. pachyurus, T. apereoides subsp. apereoides and T. apereoides subsp. laurentius. They were mated in captivity and produced viable progeny. Some F-1 hybrid females were fertile, whereas all F-1 males were sterile. Histological examination revealed meiotic arrest at the primary spermatocyte stage. No sperm was detected in testes or epididymes. Electron microscopic analysis of surface spread synaptonemal complexes revealed a complete failure of chromosome pairing in F-1 hybrids of T. pachyurus with T. apereoides subsp. laurentius and T. apereoides subsp. apereoides. In the male hybrids between T. apereoides subsp. apereoides and T. apereoides subsp. laurentius, meiosis did not proceed beyond diplotene, although all of the chromosomes, including heteromorphic ones, paired in an orderly fashion. Backcross males with homomorphic karyotypes showed segregation in meiosis progression. This indicates that male hybrid sterility is due to genetic, but not chromosomal, incompatibility of the parental taxa.
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Univ Roma La Sapienza, Dipartimento Biol Anim & Uomo, IT-00161 Rome, ItalyUniv Roma La Sapienza, Dipartimento Biol Anim & Uomo, IT-00161 Rome, Italy
Capanna, E
Castiglia, R
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Univ Roma La Sapienza, Dipartimento Biol Anim & Uomo, IT-00161 Rome, ItalyUniv Roma La Sapienza, Dipartimento Biol Anim & Uomo, IT-00161 Rome, Italy
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Univ Roma La Sapienza, Dipartimento Biol Anim & Uomo, IT-00161 Rome, ItalyUniv Roma La Sapienza, Dipartimento Biol Anim & Uomo, IT-00161 Rome, Italy
Capanna, E
Castiglia, R
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Univ Roma La Sapienza, Dipartimento Biol Anim & Uomo, IT-00161 Rome, ItalyUniv Roma La Sapienza, Dipartimento Biol Anim & Uomo, IT-00161 Rome, Italy