Quantifying rooting at depth in a wheat doubled haploid population with introgression from wild emmer

Clarke, C. K., Gregory, P. J. ORCID: https://orcid.org/0000-0002-4118-4833, Lukac, M. ORCID: https://orcid.org/0000-0002-8535-6334, Burridge, A. J., Allen, A. M., Edwards, K. J. and Gooding, M. J. (2017) Quantifying rooting at depth in a wheat doubled haploid population with introgression from wild emmer. Annals of Botany, 120 (3). pp. 457-470. ISSN 0305-7364 doi: 10.1093/aob/mcx068

Abstract/Summary

Background and aims The genetic basis of increased rooting below the plough layer, post-anthesis in the field, of an elite wheat line (Triticum aestivum cv. Shamrock) with recent introgression from wild emmer (T. dicoccoides), is investigated. Shamrock has a non-glaucous canopy phenotype mapped to the short arm of chromosome 2B (2BS), derived from the wild emmer. A secondary aim was to determine whether genetic effects found in the field could have been predicted by other assessment methods. ● Methods Roots of doubled haploid (DH) lines from a winter wheat (cv. Shamrock x Shango) population were assessed using a seedling screen in moist paper rolls, in rhizotrons to the end of tillering, and in the field post-anthesis. A linkage map was produced using single nucleotide polymorphism markers to identify quantitative trait loci (QTL) for rooting traits. ● Key results Shamrock had greater root length density (RLD) at depth than Shango, in the field and within the rhizotrons. The DH population exhibited diversity for rooting traits within the three environments studied. QTL were identified on 5D, 6B and 7B, explaining variation in RLD post-anthesis in the field. Effects associated with the non-glaucous trait on RLD interacted significantly with depth in the field and some of this interaction mapped to 2BS. The effect of genotype interacted greatly with the method of root assessment: e.g. glaucousness expressed in the field was negatively associated with RLD in the rhizotrons, but positively associated with length in the seedling screen. ● Conclusions To our knowledge, this is the first study to identify QTL for rooting at depth in field-grown wheat at mature growth stages. Within the population studied here, our results are consistent with the hypothesis that some of the variation in rooting is associated with recent introgression from wild emmer. The expression of genetic effects differed between the methods of root assessment.

Item Type	Article
URI	https://reading-clone.eprints-hosting.org/id/eprint/70337
Identification Number/DOI	10.1093/aob/mcx068
Refereed	Yes
Divisions	Interdisciplinary centres and themes > Soil Research Centre Life Sciences > School of Agriculture, Policy and Development > Department of Sustainable Land Management > Centre for Agri-environmental Research (CAER) Life Sciences > School of Agriculture, Policy and Development > Department of Crop Science
Publisher	Oxford University Press
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