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Original Research ARTICLE Provisionally accepted The full-text will be published soon. Notify me

Front. Plant Sci. | doi: 10.3389/fpls.2019.01307

Non-invasive phenotyping reveals genomic regions involved in pre-anthesis drought tolerance and recovery in spring barley

  • 1Leibniz-Institut für Pflanzengenetik und Kulturpflanzenforschung (IPK), Germany
  • 2BASF (Germany), Germany
  • 3Institut für Biologie, Humboldt-Universität zu Berlin, Germany
  • 4Global Crop Diversity Trust, Germany
  • 5Martin Luther University of Halle-Wittenberg, Germany

With ongoing climate change, drought events are becoming more frequent and will affect biomass formation when occurring during pre-flowering stages. We explored growth over time under such a drought scenario, via non-invasive imaging and revealed the underlying key genetic factors in spring barley. By comparing with well-watered conditions investigated in an earlier study and including information on timing, QTL could be classified as constitutive, drought or recovery-adaptive. Drought-adaptive QTL were found in the vicinity of genes involved in dehydration tolerance such as dehydrins (Dhn4, Dhn7, Dhn8, Dhn9) and aquaporins (e.g. HvPIP1;5, HvPIP2;7, HvTIP2;1) The influence of phenology on biomass formation increased under drought. Accordingly, the main QTL during recovery was the region of HvPPD-H1. The most important constitutive QTL for late biomass was located in the vicinity of HvDIM, while the main locus for seedling biomass was the HvWAXY region. The disappearance of QTL marked the genetic architecture of tiller number. The most important constitutive QTL was located on 6HS in the region of 1-FEH.
Stage and tolerance specific QTL might provide opportunities for genetic manipulation to stabilize biomass and tiller number under drought conditions and thereby also grain yield.

Keywords: barley, biomass, drought, Recovery, GWAS, Growth, non-invasive

Received: 10 May 2019; Accepted: 19 Sep 2019.

Copyright: © 2019 Dhanagond, Liu, Zhao, Chen, Grieco, Jochen, Kilian, Graner and Neumann. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

* Correspondence: Dr. Kerstin Neumann, Leibniz-Institut für Pflanzengenetik und Kulturpflanzenforschung (IPK), Gatersleben, 06466, Germany, neumannk@ipk-gatersleben.de