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Hybridisation has shaped a recent radiation of grass-feeding aphids.
Mathers, Thomas C; Wouters, Roland H M; Mugford, Sam T; Biello, Roberto; van Oosterhout, Cock; Hogenhout, Saskia A.
Afiliação
  • Mathers TC; Department of Crop Genetics, John Innes Centre, Norwich Research Park, Norwich, UK. thomas.mathers@jic.ac.uk.
  • Wouters RHM; Tree of Life, Welcome Sanger Institute, Hinxton, Cambridge, UK. thomas.mathers@jic.ac.uk.
  • Mugford ST; Department of Crop Genetics, John Innes Centre, Norwich Research Park, Norwich, UK.
  • Biello R; Department of Crop Genetics, John Innes Centre, Norwich Research Park, Norwich, UK.
  • van Oosterhout C; Department of Crop Genetics, John Innes Centre, Norwich Research Park, Norwich, UK.
  • Hogenhout SA; School of Environmental Sciences, University of East Anglia, Norwich, UK.
BMC Biol ; 21(1): 157, 2023 07 13.
Article em En | MEDLINE | ID: mdl-37443008
ABSTRACT

BACKGROUND:

Aphids are common crop pests. These insects reproduce by facultative parthenogenesis involving several rounds of clonal reproduction interspersed with an occasional sexual cycle. Furthermore, clonal aphids give birth to live young that are already pregnant. These qualities enable rapid population growth and have facilitated the colonisation of crops globally. In several cases, so-called "super clones" have come to dominate agricultural systems. However, the extent to which the sexual stage of the aphid life cycle has shaped global pest populations has remained unclear, as have the origins of successful lineages. Here, we used chromosome-scale genome assemblies to disentangle the evolution of two global pests of cereals-the English (Sitobion avenae) and Indian (Sitobion miscanthi) grain aphids.

RESULTS:

Genome-wide divergence between S. avenae and S. miscanthi is low. Moreover, comparison of haplotype-resolved assemblies revealed that the S. miscanthi isolate used for genome sequencing is likely a hybrid, with one of its diploid genome copies closely related to S. avenae (~ 0.5% divergence) and the other substantially more divergent (> 1%). Population genomics analyses of UK and China grain aphids showed that S. avenae and S. miscanthi are part of a cryptic species complex with many highly differentiated lineages that predate the origins of agriculture. The complex consists of hybrid lineages that display a tangled history of hybridisation and genetic introgression.

CONCLUSIONS:

Our analyses reveal that hybridisation has substantially contributed to grain aphid diversity, and hence, to the evolutionary potential of this important pest species. Furthermore, we propose that aphids are particularly well placed to exploit hybridisation events via the rapid propagation of live-born "frozen hybrids" via asexual reproduction, increasing the likelihood of hybrid lineage formation.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Afídeos Limite: Animals Idioma: En Revista: BMC Biol Ano de publicação: 2023 Tipo de documento: Article

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Afídeos Limite: Animals Idioma: En Revista: BMC Biol Ano de publicação: 2023 Tipo de documento: Article