Quantitative Trait Locus Analysis for Deep-Sowing Germination Ability in the Maize IBM Syn10 DH Population

Area of Science:

• Agronomy and Plant Genetics
• Molecular Biology

Background:

• Deep-sowing is vital for maize germination in arid/semiarid regions, but current varieties struggle with this method.
• Identifying genetic factors for deep-sowing germination is crucial for breeding resilient crops.

Purpose of the Study:

• To perform quantitative trait loci (QTL) analysis for traits related to deep-sowing germination in maize.
• To identify candidate genes associated with improved deep-sowing germination ability.

Main Methods:

• Utilized a high-resolution genetic map from an intermated B73 × Mo17 (IBM) Syn10 doubled haploid (DH) population (280 lines, 6618 bin markers).
• Conducted QTL analysis for germination rate, seedling length, mesocotyl length, plumule length, and coleoptile length under deep (12.5 cm) and standard (2 cm) sowing conditions.

Main Results:

• Detected numerous QTL for germination traits, explaining 2.51-7.8% of phenotypic variance.
• Identified 11 QTL clusters across chromosomes (excluding chromosome 8), suggesting pleiotropic effects of minor genes.
• Pinpointed six candidate genes co-located within QTL clusters, potentially regulating deep-sowing germination.

Conclusions:

• The identified QTL and candidate genes provide valuable targets for marker-assisted breeding to enhance maize deep-sowing germination.
• This study lays the groundwork for future functional studies on the genetic basis of deep-sowing adaptation in maize.