Enhancing phosphorus and zinc acquisition efficiency in rice: a critical review of root traits and their potential utility in rice breeding
Open Access
- 15 October 2012
- journal article
- review article
- Published by Oxford University Press (OUP) in Annals of Botany
- Vol. 112 (2), 331-345
- https://doi.org/10.1093/aob/mcs217
Abstract
Rice is the world's most important cereal crop and phosphorus (P) and zinc (Zn) deficiency are major constraints to its production. Where fertilizer is applied to overcome these nutritional constraints it comes at substantial cost to farmers and the efficiency of fertilizer use is low. Breeding crops that are efficient at acquiring P and Zn from native soil reserves or fertilizer sources has been advocated as a cost-effective solution, but would benefit from knowledge of genes and mechanisms that confer enhanced uptake of these nutrients by roots. This review discusses root traits that have been linked to P and Zn uptake in rice, including traits that increase mobilization of P/Zn from soils, increase the volume of soil explored by roots or root surface area to recapture solubilized nutrients, enhance the rate of P/Zn uptake across the root membrane, and whole-plant traits that affect root growth and nutrient capture. In particular, this review focuses on the potential for these traits to be exploited through breeding programmes to produce nutrient-efficient crop cultivars. Few root traits have so far been used successfully in plant breeding for enhanced P and Zn uptake in rice or any other crop. Insufficient genotypic variation for traits or the failure to enhance nutrient uptake under realistic field conditions are likely reasons for the limited success. More emphasis is needed on field studies in mapping populations or association panels to identify those traits and underlying genes that are able to enhance nutrient acquisition beyond the level already present in most cultivars.Keywords
This publication has 108 references indexed in Scilit:
- The protein kinase Pstol1 from traditional rice confers tolerance of phosphorus deficiencyNature, 2012
- Development and application of gene-based markers for the major rice QTL Phosphorus uptake 1Theoretical and Applied Genetics, 2009
- Stress Response Versus Stress Tolerance: A Transcriptome Analysis of Two Rice Lines Contrasting in Tolerance to Phosphorus DeficiencyRice, 2009
- The story of phosphorus: Global food security and food for thoughtGlobal Environmental Change, 2009
- Deoxymugineic acid increases Zn translocation in Zn-deficient rice plantsPlant Molecular Biology, 2008
- Genetic and genomic approaches to develop rice germplasm for problem soilsPlant Molecular Biology, 2007
- Roots of the Second Green RevolutionAustralian Journal of Botany, 2007
- Sub1A is an ethylene-response-factor-like gene that confers submergence tolerance to riceNature, 2006
- Over-expression of a high-affinity phosphate transporter in transgenic barley plants does not enhance phosphate uptake ratesFunctional Plant Biology, 2004
- Substitution mapping of Pup1: a major QTL increasing phosphorus uptake of rice from a phosphorus-deficient soilTheoretical and Applied Genetics, 2002