Root hairs improve root penetration, root–soil contact, and phosphorus acquisition in soils of different strength
Open Access
- 16 July 2013
- journal article
- research article
- Published by Oxford University Press (OUP) in Journal of Experimental Botany
- Vol. 64 (12), 3711-3721
- https://doi.org/10.1093/jxb/ert200
Abstract
Root hairs are a key trait for improving the acquisition of phosphorus (P) by plants. However, it is not known whether root hairs provide significant advantage for plant growth under combined soil stresses, particularly under conditions that are known to restrict root hair initiation or elongation (e.g. compacted or high-strength soils). To investigate this, the root growth and P uptake of root hair genotypes of barley, Hordeum vulgare L. (i.e. genotypes with and without root hairs), were assessed under combinations of P deficiency and high soil strength. Genotypes with root hairs were found to have an advantage for root penetration into high-strength layers relative to root hairless genotypes. In P-deficient soils, despite a 20% reduction in root hair length under high-strength conditions, genotypes with root hairs were also found to have an advantage for P uptake. However, in fertilized soils, root hairs conferred an advantage for P uptake in low-strength soil but not in high-strength soil. Improved root–soil contact, coupled with an increased supply of P to the root, may decrease the value of root hairs for P acquisition in high-strength, high-P soils. Nevertheless, this work demonstrates that root hairs are a valuable trait for plant growth and nutrient acquisition under combined soil stresses. Selecting plants with superior root hair traits is important for improving P uptake efficiency and hence the sustainability of agricultural systems.Keywords
This publication has 44 references indexed in Scilit:
- Interactions between root hair length and arbuscular mycorrhizal colonisation in phosphorus deficient barley (Hordeum vulgare)Plant and Soil, 2013
- A conceptual model of root hair ideotypes for future agricultural environments: what combination of traits should be targeted to cope with limited P availability?Annals of Botany, 2012
- What are the implications of variation in root hair length on tolerance to phosphorus deficiency in combination with water stress in barley (Hordeum vulgare)?Annals of Botany, 2012
- Fertiliser availability in a resource-limited world: Production and recycling of nitrogen and phosphorusFood Policy, 2011
- Root elongation, water stress, and mechanical impedance: a review of limiting stresses and beneficial root tip traitsJournal of Experimental Botany, 2011
- The story of phosphorus: Global food security and food for thoughtGlobal Environmental Change, 2009
- Root:soil adhesion in the maize rhizosphere: the rheological approachPlant and Soil, 1999
- Modelling Rooting Depth and Soil Strength in a Drying Soil ProfileJournal of Theoretical Biology, 1997
- Costs and benefits of constructing roots of small diameterJournal of Plant Nutrition, 1992
- Effects of soil bulk density and water regimen on root growth and uptake of phosphorus by ryegrassAustralian Journal of Agricultural Research, 1984