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Though evaporation from plant leaves drives transpiration, it also results in loss of water. Because water is critical for photosynthetic reactions and other cellular processes, evolutionary pressures on plants in different environments have driven the acquisition of adaptations that reduce water loss.

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Related Experiment Video

Updated: Mar 3, 2026

Metabolomic Analysis of Barley by Gas Chromatography/Mass Spectrometry

Metabolomic Analysis of Barley by Gas Chromatography/Mass Spectrometry

Published on: November 8, 2024

Reducing Stomatal Density in Barley Improves Drought Tolerance without Impacting on Yield.

Jon Hughes^1,2,3, Christopher Hepworth^1,2,3, Chris Dutton^1,2,3

¹Department of Molecular Biology and Biotechnology, University of Sheffield, Sheffield S10 2TN, United Kingdom (J.H., C.D., J.A.D., L.H., J.E.G.).

Plant Physiology

|May 3, 2017

Summary

Manipulating stomatal development in barley using HvEPF1 reduces stomatal density, enhancing water use efficiency and drought tolerance without impacting grain yield. This offers a strategy for improving cereal crops in dry conditions.

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Area of Science:

Plant science
Crop physiology
Molecular biology

Background:

The epidermal patterning factor (EPF) family regulates stomatal development frequency in plants.
Understanding EPF function in cereals like barley is crucial for crop improvement.

Purpose of the Study:

To investigate the role of a barley EPF ortholog (HvEPF1) in stomatal development.
To assess the impact of HvEPF1 overexpression on barley physiology and yield under water-limited conditions.

Main Methods:

Identification and overexpression of the barley HvEPF1 gene.
Analysis of stomatal density, leaf gas exchange, and physiological traits.
Evaluation of grain yield and drought tolerance in transgenic barley lines.

Main Results:

Overexpression of HvEPF1 significantly reduced stomatal density by limiting stomatal development.
Reduced stomatal density led to enhanced water use efficiency and drought tolerance.
Despite reduced gas exchange, barley plants with lower stomatal density maintained grain yield.

Conclusions:

HvEPF1 is a key regulator of stomatal development in barley.
Manipulating stomatal frequency via HvEPF1 offers a promising approach for developing climate-resilient cereal crops.
This strategy can optimize crop yields in water-scarce environments.