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Measuring Gene Expression in Bombarded Barley Aleurone Layers with Increased Throughput

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Published on: March 30, 2018

Liming can decrease legume crop yield and leaf gas exchange by enhancing root to shoot ABA signalling.

Shane A Rothwell¹, E David Elphinstone², Ian C Dodd³

¹The Lancaster Environment Centre, Lancaster University, Lancaster LA1 4YQ, UK s.rothwell1@lancaster.ac.uk.

Journal of Experimental Botany

|March 6, 2015

Summary

This summary is machine-generated.

Liming agricultural soil to increase pH can unexpectedly reduce crop yields by impairing nutrient uptake and increasing abscisic acid (ABA) levels, challenging current soil management practices.

Keywords:

Abscisic acid ionome liming phosphorus stomatal conductance wilty.

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Area of Science:

Agricultural Science
Plant Physiology
Soil Science

Background:

Sustainable agriculture requires optimizing nutrient availability for maximum crop yield.
Soil pH is traditionally managed with lime (calcium carbonate) to maintain an optimal range of 6-6.5.
However, liming can negatively impact crop performance in certain soil types.

Purpose of the Study:

To investigate the physiological mechanisms by which lime application affects crop yield.
To understand the role of nutrient availability and plant hormones in lime-induced yield reduction.
To evaluate the suitability of current liming recommendations.

Main Methods:

Field and pot trials were conducted using field bean, bean, and pea.
Soil pH was adjusted using lime, and crop yield, stomatal conductance, and shoot biomass were measured.
Ionomic analysis of root xylem sap and leaf tissue, along with phytohormone analysis (abscisic acid - ABA), was performed.
Experiments with superphosphate fertilizer and ABA application to detached leaves and ABA-deficient mutants were used to confirm mechanisms.

Main Results:

Liming sandy loam soil to pH 6.2 decreased field bean yield by ~30%.
Increased soil pH (6.3-6.7) reduced stomatal conductance (g(s)) and shoot biomass in Vicia faba, Phaseolus vulgaris, and Pisum sativum.
Liming led to decreased phosphorus concentration, correlated with reduced g(s), and increased ABA levels, particularly in pea.
ABA mediated the reduced gas exchange in response to lime-induced low phosphorus.

Conclusions:

Lime application can negatively impact crop yield by inducing phosphorus deficiency and increasing abscisic acid (ABA) levels, which reduce gas exchange.
Current liming recommendations may not be suitable for all soil types and crops.
Further research is needed to refine soil management strategies for sustainable intensification.