Characterizing introgression-by-environment interactions using maize near isogenic lines
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ORIGINAL ARTICLE
Characterizing introgression‑by‑environment interactions using maize near isogenic lines Zhi Li1 · Sara B. Tirado1,2 · Dnyaneshwar C. Kadam1 · Lisa Coffey3 · Nathan D. Miller4 · Edgar P. Spalding4 · Aaron J. Lorenz1 · Natalia de Leon5 · Shawn M. Kaeppler5 · Patrick S. Schnable3 · Nathan M. Springer2 · Candice N. Hirsch1 Received: 15 August 2019 / Accepted: 2 June 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Key message Significant introgression-by-environment interactions are observed for traits throughout development from small introgressed segments of the genome. Abstract Relatively small genomic introgressions containing quantitative trait loci can have significant impacts on the phenotype of an individual plant. However, the magnitude of phenotypic effects for the same introgression can vary quite substantially in different environments due to introgression-by-environment interactions. To study potential patterns of introgression-by-environment interactions, fifteen near-isogenic lines (NILs) with > 90% B73 genetic background and multiple Mo17 introgressions were grown in 16 different environments. These environments included five geographical locations with multiple planting dates and multiple planting densities. The phenotypic impact of the introgressions was evaluated for up to 26 traits that span different growth stages in each environment to assess introgression-by-environment interactions. Results from this study showed that small portions of the genome can drive significant genotype-by-environment interaction across a wide range of vegetative and reproductive traits, and the magnitude of the introgression-by-environment interaction varies across traits. Some introgressed segments were more prone to introgression-by-environment interaction than others when evaluating the interaction on a whole plant basis throughout developmental time, indicating variation in phenotypic plasticity throughout the genome. Understanding the profile of introgression-by-environment interaction in NILs is useful in consideration of how small introgressions of QTL or transgene containing regions might be expected to impact traits in diverse environments. Communicated by Martin Boer. Electronic supplementary material The online version of this article (https://doi.org/10.1007/s00122-020-03630-z) contains supplementary material, which is available to authorized users. * Candice N. Hirsch [email protected] 1
Department of Agronomy and Plant Genetics, University of Minnesota, 1991 Upper Buford Circle, Saint Paul, MN 55108, USA
2
Department of Plant and Microbial Biology, University of Minnesota, 1479 Gortner Avenue, Saint Paul, MN 55108, USA
3
Department of Agronomy, Iowa State University, 1111 WOI Rd, Ames, IA 50011, USA
4
Department of Botany, University of Wisconsin, 430 Lincoln Drive, Madison, WI 53706, USA
5
Department of Agronomy, University of Wisconsin, 1575 Linden Drive, Madison, WI 53706, USA
Introduction Many important agronomic traits (i.e., grain
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