A genetic tradeoff for tolerance to moderate and severe heat stress in US hybrid maize.

ABSTRACT: Global climate change is increasing both average temperatures and the frequencies of extreme high temperatures. Past studies have documented a strong negative effect of exposures to temperatures >30°C on hybrid maize yields. However, these studies could not disentangle genetic adaptation via artificial selection from changes in agronomic practices. Because most of the earliest maize hybrids are no longer available, side-by-side comparisons with modern hybrids under current field conditions are generally impossible. Here, we report on the collection and curation of 81 years of public yield trial records covering 4,730 maize hybrids, which enabled us to model genetic variation for temperature responses among maize hybrids. We show that selection may have indirectly and inconsistently contrib

SUBMITTER: Kusmec A 

PROVIDER: S-EPMC10325116 | biostudies-literature | 2023 Jul

REPOSITORIES: biostudies-literature