Genotype-by-environment interactions and local adaptation shape selection in the US National Chip Processing Trial

Author:

Agha Husain I.ORCID,Endelman Jeffrey B.ORCID,Chitwood-Brown JessicaORCID,Clough Mark,Coombs Joseph,De Jong Walter S.ORCID,Douches David S.ORCID,Higgins Charles R.,Holm David G.,Novy Richard,Resende Marcio F. R.ORCID,Sathuvalli VidyasagarORCID,Thompson Asunta L.ORCID,Yencho G. CraigORCID,Zotarelli LincolnORCID,Shannon Laura M.ORCID

Abstract

Abstract Key message We find evidence of selection for local adaptation and extensive genotype-by-environment interaction in the potato National Chip Processing Trial (NCPT). Abstract We present a novel method for dissecting the interplay between selection, local adaptation and environmental response in plant breeding schemes. Balancing local adaptation and the desire for widely adapted cultivars is challenging for plant breeders and makes genotype-by-environment interactions (GxE) an important target of selection. Selecting for GxE requires plant breeders to evaluate plants across multiple environments. One way breeders have accomplished this is to test advanced materials across many locations. Public potato breeders test advanced breeding material in the National Chip Processing Trial (NCPT), a public–private partnership where breeders from ten institutions submit advanced chip lines to be evaluated in up to ten locations across the country. These clones are genotyped and phenotyped for important agronomic traits. We used these data to interrogate the NCPT for GxE. Further, because breeders submitting clones to the NCPT select in a relatively small geographic range for the first 3 years of selection, we examined these data for evidence of incidental selection for local adaptation, and the alleles underlying it, using an environmental genome-wide association study (envGWAS). We found genomic regions associated with continuous environmental variables and discrete breeding programs, as well as regions of the genome potentially underlying GxE for yield.

Funder

Minnesota Department of Agriculture

National Institute of Food and Agriculture

Publisher

Springer Science and Business Media LLC

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