Impact of soil tillage on the robustness of the genetic component of variation in phosphorus (P) use efficiency in barley (Hordeum vulgare L.)
- 517 Downloads
To enhance the sustainability of agriculture it is imperative that the use of P-fertilisers by temperate cereal crops be improved. This can be achieved both by agronomic and genetic approaches. While many studies have demonstrated genotypic variation in P-use efficiency in a number of cereal species the robustness of this genetic variation in contrasting environments is rarely considered. In this paper we describe an experiment in which we compare the P-nutrition of winter and spring barley genotypes from an association genetic-mapping population grown in a field trial with different cultivation treatments (conventional plough vs. minimum tillage) which had been established over a number of years. We demonstrate that, while there is significant variation between genotypes in their P nutrition, this variation is not comparable between cultivation treatments and only one winter barley genotype (cv. Gleam) has beneficial P-use efficiency traits in both cultivation systems. Analysis of the association genetic-mapping population demonstrated that there was a strong environmental component in the genotypic variation, with more significant associations of shoot P concentration with known SNP (Single Nucleotide Polymorphism) markers when the population was grown in minimum tillage treatments. These data suggest that it may be possible to identify genetic components to variation in P nutrition in barley, but that a large interaction with environmental variables may limit the usefulness of any genes or markers discovered for improving P-use efficiency to the conditions under which the screening was performed.
KeywordsAssociation mapping population Barley P-use efficiency Sustainability Conservation tillage
This work was supported by the Scottish Government through the Rural and Environmental Research and Analysis Directorate and a Personal Research Fellowship (TSG) from the Royal Society of Edinburgh. The authors would like to thank Euan Cauldwell and field staff at SCRI for their maintenance of the tillage treatments and trials.
- Chan KY, Mead JA, Roberts WP (1987) Poor early growth of wheat under direct drilling. Aus J Agric Res 38:791–800Google Scholar
- FAO (1994) Soil Map of the world. Revised legend, with corrections and updates. World Soil Resources Report 60, FAO, RomeGoogle Scholar
- Gregory PJ (2006) Plant roots: Growth, activity, and interaction with soils. BlackwellGoogle Scholar
- Hamblin AP (1987) The effect of tillage on soil physical conditions. In: Cornish PS, Pratley JE (eds) Tillage: New directions for Australian agriculture. Inkata, Sydney, pp 128–170Google Scholar
- Heffernan B (1985) A handbook of the methods of inorganic chemical analysis for forest soils, foliage and water. CSIRO Division of Forest Research, CanberraGoogle Scholar
- Johnston AE (2008) Proceedings of The International Fertiliser Society 630. Resource or waste: the reality of nutrient recycling to land. FFS, YorkGoogle Scholar
- Lofkvist J, Whalley WR, Clark LJ (2005) A rapid screening method for good root-penetration ability: Comparison of species with very different root morphology. Acta Agric Scand B-Soil Plant Sci 55:120–124Google Scholar
- Newton AC, Swanston JS, Guy D, Hallett PD (2008) Variety mixtures: on farm mixing and interaction with cultivation methods. Proceedings of the Crop Protection in Northern Britain Conference 2008:115–120Google Scholar
- Rostoks N, Ramsay L, MacKenzie K, Cardle L, Bhat PR, Roose ML, Svensson JT, Stein N, Varshney RK, Marshall DF, Graner A, Close TJ, Waugh R (2006) Recent history of artificial outcrossing facilitates whole-genome association mapping in elite inbred crop varieties. Proc Nat Acad Sci USA 103:18656–18661CrossRefPubMedGoogle Scholar
- Smith SE, Read DJ (1997) Mycorrhizal symbiosis. Academic, San DiegoGoogle Scholar
- White PJ, Broadley MR, Greenwood DJ, Hammond JP (2005) Proceedings of The International Fertiliser Society 568. Genetic modifications to improve phosphorus acquisition by roots. IFS, YorkGoogle Scholar