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Updated: Jul 12, 2025

Imaging and Analysis for Quantifying Maize (Zea mays) Abiotic Stress Phenotypes
Published on: March 28, 2025
Plasticity QTLs specifically contribute to the genotype × water availability interaction in maize
Yacine Djabali1,2,3, Renaud Rincent3, Marie-Laure Martin4,5,6
1Université Paris-Saclay, CNRS, INRAE, Université Evry, Institute of Plant Sciences Paris-Saclay (IPS2), 91190, Gif-sur-Yvette, France.
Identifying genetic markers for drought tolerance in maize is crucial. This study reveals that plasticity quantitative trait loci (pQTLs) are key to understanding genotype x water availability interactions, improving drought resilience strategies.
Area of Science:
- Plant genetics
- Agronomy
- Drought stress research
Background:
- Maize yield losses due to drought are a growing concern.
- Identifying genetic markers for drought tolerance is essential for breeding.
- The genetic basis of drought response is complex.
Purpose of the Study:
- Investigate the genetic basis of drought response in maize.
- Identify quantitative trait loci (QTLs) and plasticity QTLs (pQTLs) related to drought tolerance.
- Assess the role of phenotypic plasticity in maize's response to water availability.
Main Methods:
- Multi-trial genome-wide association study (GWAS) on 254 maize hybrids.
- Phenotypic data collected under well-watered and water deficit conditions.
- Analysis of phenotypic plasticity indices for six ecophysiological traits.
Main Results:
- Identified 102 QTLs and 40 pQTLs, many novel.
- pQTLs identified distinct genetic regions not found by traditional QTLs.
- pQTLs explained 60-100% of the variance in genotype by water availability interaction for most traits.
Conclusions:
- Phenotypic plasticity is critical for understanding drought response in maize.
- pQTLs are specifically involved in genotype x water availability interactions.
- Combined QTLs and pQTLs explain over 75% of the interaction variance, revealing new genetic regions for drought tolerance.
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