Abiotic stress growth conditions induce different responses in kernel iron concentration across genotypically distinct maize inbred varieties

Frontiers in Plant Science
Catherine B KandianisAnn E Stapleton

Abstract

The improvement of grain nutrient profiles for essential minerals and vitamins through breeding strategies is a target important for agricultural regions where nutrient poor crops like maize contribute a large proportion of the daily caloric intake. Kernel iron concentration in maize exhibits a broad range. However, the magnitude of genotype by environment (GxE) effects on this trait reduces the efficacy and predictability of selection programs, particularly when challenged with abiotic stress such as water and nitrogen limitations. Selection has also been limited by an inverse correlation between kernel iron concentration and the yield component of kernel size in target environments. Using 25 maize inbred lines for which extensive genome sequence data is publicly available, we evaluated the response of kernel iron density and kernel mass to water and nitrogen limitation in a managed field stress experiment using a factorial design. To further understand GxE interactions we used partition analysis to characterize response of kernel iron and weight to abiotic stressors among all genotypes, and observed two patterns: one characterized by higher kernel iron concentrations in control over stress conditions, and another with higher ...Continue Reading

Methods Mentioned

BETA
one hybrid
environmental treatment
environmental stress
environmental
environmental stresses

Software Mentioned

SAS JMP
SAS
R
SOM
SAS Enterprise Miner Ensemble
mvpart
Kohonen
R program

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