Reactive oxygen species localization in roots of <Emphasis Type="Italic">Arabidopsis thaliana</Emphasis> seedlings grown under phosphate deficiency |
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Authors: | Jarosław Tyburski Kamila Dunajska Andrzej Tretyn |
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Institution: | (1) Department of Biotechnology, Institute of General and Molecular Biology, Nicolaus Copernicus University, Gagarina 9, 87-100 Toruń, Poland |
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Abstract: | Arabidopsis plants responding to phosphorus (P) deficiency increase lateral root formation and reduce primary root elongation. In addition
the number and length of root hairs increases in response to P deficiency. Here we studied the patterns of radical oxygen
species (ROS) in the roots of Arabidopsis seedlings cultured on media supplemented with high or low P concentration. We found that P availability affected ROS distribution
in the apical part of roots. If plants were grown on high P medium, ROS were located in the root elongation zone and quiescent
centre. At low P ROS were absent in the elongation zone, however, their synthesis was detected in the primary root meristem.
The proximal part of roots was characterized by ROS production in the lateral root primordia and in elongation zones of young
lateral roots irrespective of P concentration in the medium. On the other hand, plants grown at high or low P differed in
the pattern of ROS distribution in older lateral roots. At high P, the elongation zone was the primary site of ROS production.
At low P, ROS were not detected in the elongation zone. However, they were present in the proximal part of the lateral root
meristem. These results suggest that P deficiency affects ROS distribution in distal parts of Arabidopsis roots. Under P-sufficiency ROS maximum was observed in the elongation zone, under low P, ROS were not synthesized in this
segment of the root, however, they were detected in the apical root meristem. |
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Keywords: | Hydrogen peroxide Lateral roots Phosphate availability Superoxide Root growth Root system architecture |
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