Natural genetic variation of Arabidopsis thaliana root morphological response to magnesium supply
Qiying Xiao A D , Hugues De Gernier A D , László Kupcsik A D , Jérôme De Pessemier A , Klaus Dittert B , Kirsten Fladung B , Nathalie Verbruggen A and Christian Hermans A C
+ Author Affiliations
- Author Affiliations
A Laboratory of Plant Physiology and Molecular Genetics, Université Libre de Bruxelles, Campus Plaine CP 242, Bd du Triomphe, B-1050 Brussels, Belgium.
B Institute of Applied Plant Nutrition at University of Goettingen, Carl-Sprengel-Weg 1, D-37075 Goettingen, Germany.
C Corresponding author. Email: chermans@ulb.ac.be
D These authors made equal contributions.
Crop and Pasture Science 66(12) 1249-1258 https://doi.org/10.1071/CP15108
Submitted: 31 March 2015 Accepted: 22 November 2015 Published: 21 December 2015
Abstract
Plants dynamically cope with the variability of mineral nutrient distribution in soil by constantly modulating nutrient uptake and shaping root-system architecture. The changes in root morphology in response to major essential elements are largely documented, but little is known about how the root system responds to magnesium (Mg) availability. Thirty-six natural accessions of the model species Arabidopsis thaliana were subjected to an in vitro screen for identifying variation in root system architecture in response to Mg availability. Response of root morphology was observed on 2-dimensional agar plates. Low Mg supply repressed the elongation of the lateral roots more than of the primary root. However, some accessions exhibited higher number and length of lateral roots than the reference Columbia-0. Across all accessions, the root morphological traits did not correlate with tissue Mg concentrations. Interestingly, shoot calcium and root phosphorus concentrations were positively correlated with the number and length of lateral roots, whereas root iron concentration was negatively correlated with the primary root length. The diversity of root phenotypes identified in this report is a useful resource to study the genetic component determining root morphology in response to Mg availability.
Additional keywords: magnesium supply, natural variation.
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