Wheat growth responses to soil mechanical impedance are dependent on phosphorus supply

0541800 - ÚEB 2022 RIV NL eng J - Journal Article
Wang, X. - Shen, J. - Hedden, Peter - Phillips, A. L. - Thomas, S. G. - Ge, Y. - Ashton, R. W. - Whalley, W. R.
Wheat growth responses to soil mechanical impedance are dependent on phosphorus supply.
Soil & Tillage Research. Roč. 205, JAN (2021), č. článku 104754. ISSN 0167-1987. E-ISSN 1879-3444
R&D Projects: GA ČR(CZ) GA18-10349S; GA MŠMT(CZ) EF16_019/0000738
Institutional support: RVO:61389030
Keywords : Gibberellin sensitivity * Phosphorus absorption * Rht-1 dwarfing alleles * Root impedance * Triticum aestivum
OECD category: Biochemical research methods
Impact factor: 7.366, year: 2021
Method of publishing: Open access
http://doi.org/10.1016/j.still.2020.104754

Increased mechanical impedance induced by soil drying or compaction causes reduction in plant growth and crop yield. However, how mechanical impedance interacts with nutrient stress has been largely unknown. Here, we investigated the effect of mechanical impedance on the growth of wheat seedlings under contrasting phosphorus (P) supply in a sand culture system which allows the mechanical impedance to be independent of water and nutrient availability. Two wheat genotypes containing the Rht-B1a (tall) or Rht-B1c (gibberellin-insensitive dwarf) alleles in the Cadenza background were used and their shoot and root traits were determined. Mechanical impedance caused a significant reduction in plant growth under sufficient P supply, including reduced shoot and root biomass, leaf area and total root length. By contrast, under low P supply, mechanical impedance did not affect biomass, tiller number, leaf length, and nodal root number in both wheat genotypes, indicating that the magnitude of the growth restriction imposed by mechanical impedance was dependent on P supply. The interaction effect between mechanical impedance and P level was significant on most plant traits except for axial and lateral root length, suggesting an evident physical and nutritional interaction. Our findings provide valuable insights into the integrated effects of plants in response to both soil physical and nutritional stresses. Understanding the response patterns is critical for optimizing soil tillage and nutrient management in the field.
Permanent Link: http://hdl.handle.net/11104/0319329