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Updated: Jun 24, 2026

Measuring Gene Expression in Bombarded Barley Aleurone Layers with Increased Throughput

Measuring Gene Expression in Bombarded Barley Aleurone Layers with Increased Throughput

Published on: March 30, 2018

Differential capacity for high-affinity manganese uptake contributes to differences between barley genotypes in

Pai Pedas¹, Christopher A Hebbern, Jan K Schjoerring

¹Plant and Soil Science Laboratory, Department of Agricultural Sciences , Royal Veterinary and Agricultural University, DK-1871 Frederiksberg C, Copenhagen, Denmark.

Plant Physiology

|October 26, 2005

Summary

This summary is machine-generated.

Barley genotypes show varied manganese (Mn) uptake. Mn-efficient barley has a significantly higher capacity for high-affinity manganese influx, leading to better growth in low-Mn soils.

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Area of Science:

Plant Physiology
Agricultural Science
Nutrient Uptake

Background:

Barley (Hordeum vulgare) exhibits significant genotypic variation in manganese (Mn) availability tolerance.
The physiological mechanisms underlying Mn efficiency in barley remain largely unknown.

Purpose of the Study:

To investigate the physiological basis of manganese (Mn) efficiency in barley.
To compare Mn2+ influx and root compartmentation between Mn-efficient and Mn-inefficient barley genotypes.

Main Methods:

Characterization of high- and low-affinity Mn2+ transport systems in barley roots.
Inductively coupled plasma-mass spectrometry (ICP-MS) for measuring Mn net uptake.
54Mn2+ efflux studies for root compartmentation analysis.
Hydroponic co-cultivation experiments under low Mn conditions.

Main Results:

Two Mn2+ transport systems were identified: high-affinity (up to 130 nm) and low-affinity (>130 nm).
Mn-efficient genotype Vanessa demonstrated a fourfold higher Vmax for high-affinity Mn influx compared to the inefficient genotype Antonia.
Vanessa exhibited significantly higher Mn net uptake and shoot Mn content (55-75%) than Antonia under low Mn conditions.
Subcellular analysis revealed higher vacuolar Mn accumulation in both genotypes (93% in Vanessa, 83% in Antonia).

Conclusions:

Differential high-affinity manganese (Mn) influx capacity is a key factor in barley genotypic differences in Mn efficiency.
Enhanced Mn uptake via high-affinity transport provides a competitive advantage for Mn-efficient barley in low-Mn environments.