Genetic analysis of maize seedling root traits under chilling conditions highlights role in early field establishment

A preprint on bioRxiv describes a large-scale genetic analysis of maize (Zea mays) seedling root system architecture under chilling conditions, using a high-throughput phenotyping platform applied to a doubled haploid population that incorporates allelic diversity from landraces.

The study characterises genetic variation for root traits — including root length, angle, and architecture — that are relevant to early plant establishment in temperate regions where cold soil temperatures during the growing season constrain seedling vigour. Landraces, traditional varieties selected over generations in local environments, were used as sources of allelic diversity to enrich the genetic basis of modern breeding material. The authors identify genomic regions associated with root phenotypes under chilling stress, contributing to efforts to develop maize varieties with improved nutrient uptake and early vigour.

The work is relevant to crop genomics, quantitative genetics, and plant breeding research. It illustrates how combining phenomic data collection at scale with diverse genetic resources can expand the toolkit available for marker-assisted or genomic selection programmes. As a preprint, the findings have not yet been peer-reviewed.