Genetic constitution of parthenogenetic form of Polydrusus inustus (Coleoptera: Curculionidae)--hints of hybrid origin and recombinations.
نویسندگان
چکیده
Asexual reproduction among insects may arise spontaneously, as a result of infectious agents or hybridization between phylogenetically distinct organisms. Polyploidy, which may be the result of auto- or allopoliploidization (also associated with hybridization), is often connected with parthenogenesis. However, all studied parthenogens of weevils were apomictic, rare meiotic stages have been observed in a few of them what could suggests in their genomes besides the mutational changeability also recombination may occurs. We studied the level of heterozygosity in Internal Transcribed Spacer 2 sequences, and congruence ofmitochondrial (cytochrome B) and nuclear genealogies among individuals of parthenogenetic form of Polydrusus inustus. High frequency (87.0%) of heterozygotes in ITS2 sequences may indicate a hybrid origin of the parthenogen. It is possible that this parthenogenetic form arose via a hybridization event between phylogenetically distinct lineages of bisexual P. inustus, known only from Georgia and Turkey, or between this species and one of the closely relatives from the subgenus Scythodrusus. Although result of partition- homogeneity test did not show significant incongruence of mitochondrial and nuclear genealogies, in the network was detected one loop. Most probable explanations for existence of that loop in parthenogenetic form and for origin of rare homozygotes, which were detected in ITS2 sequences, is gene conversion. It is supported by recently cytogenetic studies indicating rare meiotic stages during the oogenesis of triploids of P. inustus.
منابع مشابه
Two new species of Polydrusus (Polydrusus) from Turkey, Iran and Greece (Coleoptera: Curculionidae: Entiminae: Polydrusini).
Polydrusus (Polydrusus) kadleci sp. n. from northeastern Turkey and western Iran and P. (Polydrusus) wymanni sp. n. from Samos Island (Greece) are described. Both species show characteristic raised setae on the pronotum and elytra, the length of which is apparently sexually dimorphic. The lectotype of P. (Polydrusus) mecedanus Reitter, 1908 is designated. New faunistic data of other species nea...
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ورودعنوان ژورنال:
- Folia biologica
دوره 57 3-4 شماره
صفحات -
تاریخ انتشار 2009