Research reveals how crop roots penetrate hard soils

Iris leaves growing in the UK.

Scientists have discovered a signal that causes roots to stop growing in hard soils, which can be ‘switched off’ to allow them to punch through compacted soil.

This discovery could help plants to grow in even the most damaged soils.

Plant signal ‘ethylene’

An international research team has discovered how the plant signal ‘ethylene’ causes roots to stop growing in hard soils. After this signal is disabled, roots are able to push through compacted soil.

The research team is led by scientists from the University of Nottingham’s Future Food Beacon and Shanghai Jiao Tong University.

The research has been published in Science.

Challenges with hard soil

Hard or compacted soils represent a major challenge facing modern agriculture that can reduce crop yields over 50% by reducing root growth, causing significant losses annually.

Europe has over 33-million-hectares of soil prone to compaction which represents the highest in the world.

Soil compaction triggers a reduction in root penetration and uptake of water and nutrients.

Despite its clear importance for agriculture and global food security, the mechanism underpinning root compaction responses has been unclear until now.

The research utilised X-ray Computed Tomography scanners available at the Hounsfield Facility at the University of Nottingham to visualise in situ how plant roots responded to compacted soil.

A global collaboration

The international team involved in this new Science paper includes researchers drawn from nine universities based in Europe, China and USA, integrating expertise spanning plant and soil sciences, bioimaging and mathematics.

The team involves several early career researchers including Dr. Bipin Pandey and Dr. Rahul Bhosale who are funded by:

  • Royal Society Challenge Grant
  • Biotechnology and Biological Sciences Research Council Discovery Fellowship
  • University of Nottingham Future Food Beacon awards.

Huge implications for agriculture

Professor Malcolm Bennett from the University of Nottingham School of Biosciences said:

Understanding how roots penetrate hard soils has huge implications for agriculture, as this knowledge will be crucial for breeding crops more resilient to soil compaction.

Our team’s identification that the plant signal ethylene controls root responses to hard soil opens up new opportunities to select novel compaction resistant crops.

Using our imaging approach

Professor Sacha Mooney from the University of Nottingham and Director of the Hounsfield Facility explained:

Prior to this research we assumed that the hardness of the soil prevented roots growing deeper.

By using our imaging approach, we were able to see that roots continued growing in very hard soils when the ethylene signal was switched off. The potential for new crops that can now go deeper in soils and capture previously unavailable resources is really exciting!

Further information

More information is available from:

  • Professor Malcom Bennett
    +(44) (0) 115 937 2604
  • Jane Icke, Media Relations Manager for the Faculty of Science at the University of Nottingham
    +(44) (0) 115 951 5751

Notes to editors

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