Novel microsatellite markers suggest the mechanism of parthenogenesis in Extatosoma tiaratum is automixis with terminal fusion

Yasaman Alavi; Anthony van Rooyen; Mark Adrian Elgar; Therésa Melanie Jones; Andrew Raymond Weeks

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Novel microsatellite markers suggest the mechanism of parthenogenesis in Extatosoma tiaratum is automixis with terminal fusion

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Parthenogenetic reproduction is taxonomically widespread and occurs through various cytological mechanisms,which have different impact on the genetic variation of the offspring.Extatosoma tiaratum is a facultatively parthenogenetic Australian insect (Phasmatodea),in which females oviposit continuously throughout their adult lifespan irrespective of mating.Fertilized eggs produce sons and daughters through sexual reproduction and unfertilized eggs produce female offspring via parthenogenesis.Here,we developed novel microsatellite markers for E.tiaratum and characterized them by genotyping individuals from a natural population.We then used the microsatellite markers to infer the cytological mechanism of parthenogenesis in this species.We found evidence suggesting parthenogenesis in E.tiaratum occurs through automixis with terminal fusion,resulting in substantial loss of microsatellite heterozygosity in the offspring.Loss of microsatellite heterozygosity may be associated with loss of heterozygosity in fitness related loci.The mechanism of parthenogenetic reproduction can therefore affect fitness outcomes and needs to be considered when comparing costs and benefits of sex versus parthenogenesis.

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《中国昆虫科学：英文版》 |2018年第1期|24-32|共9页
作者
Yasaman Alavi; Anthony van Rooyen; Mark Adrian Elgar; Therésa Melanie Jones; Andrew Raymond Weeks;
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School of BioSciences, University of Melbourne, Victoria, Australia;

Cesar Pty Ltd, 293 Royal Parade, Parkville, Victoria, Australia;

School of BioSciences, University of Melbourne, Victoria, Australia;

School of BioSciences, University of Melbourne, Victoria, Australia;

School of BioSciences, University of Melbourne, Victoria, Australia;

Cesar Pty Ltd, 293 Royal Parade, Parkville, Victoria, Australia;

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Novel microsatellite markers suggest the mechanism of parthenogenesis in Extatosoma tiaratum is automixis with terminal fusion

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