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Imaging and Analysis for Quantifying Maize (Zea mays) Abiotic Stress Phenotypes
Published on: March 28, 2025
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Reduced root cortical cell file number improves drought tolerance in maize.
Joseph G Chimungu1, Kathleen M Brown1, Jonathan P Lynch2
1Department of Plant Science, Pennsylvania State University, University Park, Pennsylvania 16802.
Plant Physiology
|October 31, 2014
Summary
Reducing root cortical cell file number (CCFN) in maize enhances drought tolerance by lowering metabolic costs, promoting deeper root growth, and improving water acquisition for better crop yields.
Area of Science:
- Plant Science
- Agronomy
- Genetics
Background:
- Drought stress significantly impacts maize (Zea mays) yield.
- Improving drought tolerance is crucial for global food security.
- Root architecture plays a key role in plant water uptake.
Purpose of the Study:
- To test if reduced root cortical cell file number (CCFN) improves drought tolerance in maize.
- To investigate the physiological and growth responses of maize with varying CCFN under water stress.
- To assess the potential of CCFN as a breeding target for enhanced drought resilience.
Main Methods:
- Maize genotypes with contrasting CCFN (6-19) were evaluated under well-watered and water-stressed conditions.
- Experiments were conducted in controlled greenhouse mesocosms and field trials in the US and Malawi.
- Measurements included root respiration, rooting depth, stomatal conductance, CO2 assimilation, water content, biomass, and yield.
Main Results:
- Reduced CCFN correlated with a 57% decrease in root respiration per unit length.
- Under water stress, reduced CCFN genotypes exhibited 15-60% deeper rooting and improved water status.
- These genotypes showed 35-70% greater shoot biomass and 33-114% higher yields compared to high CCFN counterparts.
Conclusions:
- Reduced CCFN enhances maize drought tolerance by lowering metabolic soil exploration costs.
- This trait facilitates deeper water capture, leading to improved growth and yield under drought.
- CCFN represents a promising genetic target for breeding more resilient maize varieties.
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