Soil penetration by maize roots is negatively related to ethylene‐induced thickening

Vanhees, Dorien J.; Schneider, Hannah M.; Sidhu, Jagdeep Singh; Loades, Kenneth W.; Bengough, A. Glyn; Bennett, Malcolm J.; Pandey, Bipin K.; Brown, Kathleen M.; Mooney, Sacha J.; Lynch, Jonathan P.

doi:10.1111/pce.14175

Title: Soil penetration by maize roots is negatively related to ethylene‐induced thickening

Journal Article · 07 September 2021 · Plant, Cell and Environment

DOI: https://doi.org/10.1111/pce.14175 · OSTI ID:1819217

Vanhees, Dorien J. ^[1]; Schneider, Hannah M. ^[2]; Sidhu, Jagdeep Singh ^[3]; Loades, Kenneth W. ^[4]; Bengough, A. Glyn ^[5]; Bennett, Malcolm J. ^[6]; Pandey, Bipin K. ^[6]; Brown, Kathleen M. ^[3];

^[6];

^[7]

School of Biosciences University of Nottingham, Sutton Bonington Campus Leicestershire UK, The James Hutton Institute Invergowrie UK
Department of Plant Science The Pennsylvania State University University Park Pennsylvania USA, Centre for Crop Systems Analysis Wageningen University &, Research Wageningen The Netherlands
Department of Plant Science The Pennsylvania State University University Park Pennsylvania USA
The James Hutton Institute Invergowrie UK
The James Hutton Institute Invergowrie UK, School of Science and Engineering The University of Dundee Dundee UK
School of Biosciences University of Nottingham, Sutton Bonington Campus Leicestershire UK
School of Biosciences University of Nottingham, Sutton Bonington Campus Leicestershire UK, Department of Plant Science The Pennsylvania State University University Park Pennsylvania USA

Abstract Radial expansion is a classic response of roots to a mechanical impedance that has generally been assumed to aid penetration. We analysed the response of maize nodal roots to impedance to test the hypothesis that radial expansion is not related to the ability of roots to cross a compacted soil layer. Genotypes varied in their ability to cross the compacted layer, and those with a steeper approach to the compacted layer or less radial expansion in the compacted layer were more likely to cross the layer and achieve greater depth. Root radial expansion was due to cortical cell size expansion, while cortical cell file number remained constant. Genotypes and nodal root classes that exhibited radial expansion in the compacted soil layer generally also thickened in response to exogenous ethylene in hydroponic culture, that is, radial expansion in response to ethylene was correlated with the thickening response to impedance in soil. We propose that ethylene insensitive roots, that is, those that do not thicken and can overcome impedance, have a competitive advantage under mechanically impeded conditions as they can maintain their elongation rates. We suggest that prolonged exposure to ethylene could function as a stop signal for axial root growth.

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Sponsoring Organization:: USDOE

Grant/Contract Number:: NONE; AR0000821

OSTI ID:: 1819217

Journal Information:: Plant, Cell and Environment, Journal Name: Plant, Cell and Environment Journal Issue: 3 Vol. 45; ISSN 0140-7791

Publisher:: Wiley-BlackwellCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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