Differences in egg hatching time between cyclical and obligate parthenogenetic lineages of aphids
作者机构：Unite Mixte de Recherche IGEPP 1349INRAIAgrocampus OuestlUniversite Rennes 1Le Rheu cedexFrance
出 版 物：《Insect Science》 (昆虫科学（英文版）)
年 卷 期：2019年第26卷第1期
页 面：135-141页
核心收录：
学科分类：0710[理学-生物学] 07[理学] 09[农学]
主 题：asexuality diapauses genetic variation insects overwintering strategies reproductive mode
摘 要：Many aphid species exhibit a variation in reproductive mode which is influenced by winter climate regimes,with cyclical parthenogenetic (CP)lines dominating in cold winter areas (because they produce cold-resistant eggs)and obligate parthenogenetic (OP) ones in mild winter regions (because of their parthenogenetic overwintering).Genetic studies on several aphid species have shown that the OP trait can be transmitted during sexual events involving the 2 types of *** genetic system could be considered as a local safeguarding mechanism for OP alleles in case severe frost would have killed all parthenogenetically overwintering ***,this strategy would only be efficient in restoring local polymorphism in breeding systems if the newly hatched OP recombinants remain competitive over their CP *** this study we compared egg hatching sequences of CP and OP F1 clones from several crosses obtained for 2 cereal aphid species,Sitobion avenae (constant 5℃,8 h of light)and Rhopalosiphum padi (winter outdoor conditions).For ***,we obtained F1 offspring from 6 crosses, involving 4 clones while in *** F1 were obtained from 11 crosses involving 14 clones. We showed that in both species proportions of OP clones were higher in the first half of the progeny relative to the second *** addition,F1 OP clones hatched in the mean about a week earlier than their CP sibs,which gives them a demographic advantage at the start of the growth *** then discussed the consequences of this fitness advantage for the maintenance and spread of the OP trait in aphid populations.
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