Asexual reproduction of a few genotypes favored the invasion of the cereal aphid Rhopalosiphum padi in Chile

PeerJ
María E Rubio-MeléndezClaudio C Ramírez

Abstract

Aphids (Hemiptera: Aphididae) are insects with one of the highest potentials for invasion. Several aphid species are present globally due to introduction events; they represent important pests of agroecosystems. The bird cherry-oat aphid Rhopalosiphum padi (Linnaeus) is a major pest of cereals and pasture grasses worldwide. Here, we report the genetic features of populations of R. padi that colonize different cereal crops in central Chile. Rhopalosiphum padi individuals were collected in central Chile and genotyped at six microsatellite loci. The most frequent multilocus genotype (MLG) was then studied further to assess its reproductive performance across cereal hosts under laboratory conditions. Populations of R. padi in Chile are characterized by a low clonal diversity (G/N = 62/377 = 0.16) and the overrepresentation of a few widely distributed MLGs. One of the MLGs constituted roughly half of the sample and was observed in all sampled populations at high frequencies. Furthermore, this putative aphid "superclone" exhibited variations in its reproductive performance on cereals most commonly cultivated in Chile. The sampled populations also exhibited weak signs of genetic differentiation among hosts and localities. Our findings...Continue Reading

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Citations

Aug 14, 2020·Ecology and Evolution·Sebastián I MartelFrancisco Bozinovic

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Methods Mentioned

BETA
genotyping
PCRs
PCR

Software Mentioned

R package
Rcmdr
ARLEQUIN
MICRO
lsmeans
GENALEX
GeneMaker
F ST
GENCLONE
STRUCTURE HARVESTER

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