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Titolo:
Heterozygous fitness effects of clonally transmitted genomes in waterfrogs
Autore:
Vorburger, C;
Indirizzi:
Univ Zurich, Inst Zool, CH-8057 Zurich, Switzerland Univ Zurich Zurich Switzerland CH-8057 Zool, CH-8057 Zurich, Switzerland
Titolo Testata:
JOURNAL OF EVOLUTIONARY BIOLOGY
fascicolo: 4, volume: 14, anno: 2001,
pagine: 602 - 610
SICI:
1010-061X(200107)14:4<602:HFEOCT>2.0.ZU;2-P
Fonte:
ISI
Lingua:
ENG
Soggetto:
RANA-ESCULENTA COMPLEX; LIFE-HISTORY TRAITS; DROSOPHILA-MELANOGASTER; MUTATION-RATE; POPULATIONS; TADPOLES; SEX; COMPETITION; EVOLUTION; SURVIVAL;
Keywords:
clonal reproduction; deleterious mutations; environmental stress; heterozygosity; hybridogenesis; Rana esculenta complex; tadpoles;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
57
Recensione:
Indirizzi per estratti:
Indirizzo: Vorburger, C Univ Zurich, Inst Zool, Winterthurerstr 190, CH-8057 Zurich, Switzerland Univ Zurich Winterthurerstr 190 Zurich Switzerland CH-8057 d
Citazione:
C. Vorburger, "Heterozygous fitness effects of clonally transmitted genomes in waterfrogs", J EVOL BIOL, 14(4), 2001, pp. 602-610

Abstract

The European waterfrog Rana esculenta (RL-genotype) is a natural hybrid between R. ridibunda (RR) and R. lessonae (LL) and reproduces by hybridogenesis, i.e. it eliminates the L-genome from the germline and produces gametes only containing the clonally transmitted R-genome. Because of the lack of recombination, R-genomes are prone to accumulate spontaneous deleterious mutations. The homozygous effects of such mutations become evident in matings between hybrids: their offspring possess two clonal R-genomes and are generally inviable. However, the evolutionary fate of R. esculenta mainly depends on the heterozygous effects of mutations on the R-genome. These effects may be hidden in the hybrid R. esculenta because it has been shown to benefit from spontaneous heterosis. To uncouple clonal inheritance from hybridity, I crossed R. esculenta with R. ridibunda to produce nonhybrid offspring with one clonal and one sexual R-genome, and compared their survival and larval performance with normal, sexually produced R. ridibunda tadpoles. Because environmental stress can enhance the negative effects of mutation accumulation, I measured the performance at high and low food levels. There was no indication that tadpoles with a clonal genome performed worse at either food level, suggesting that at least in the larval stage, R. esculenta benefits from heterosis without incurring any costs because of heterozygous effects of deleterious mutations on the clonally transmitted R-genome.

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Documento generato il 01/10/20 alle ore 06:23:22