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High-resolution quantification of root dynamics in split-nutrient rhizoslides reveals rapid and strong proliferation of maize roots in response to local high nitrogen.

in 't Zandt D, Le Marié C, Kirchgessner N, Visser EJ, Hund A - J. Exp. Bot. (2015)

Bottom Line: This may be a desirable trait in breeding programmes, since it decreases NO3(-) leaching and N2O emission.By contrast, laterals on the side without N did not show any detectable elongation beyond the first day after their emergence.We conclude that split-nutrient rhizoslides have great potential to improve our knowledge about nitrogen responsiveness and selection for contrasting genotypes.

View Article: PubMed Central - PubMed

Affiliation: Department of Experimental Plant Ecology, Radboud University Nijmegen, Heijendaalseweg 135, 6525 AJ Nijmegen, The Netherlands Crop Science, Swiss Federal Institute of Technology Zurich, Universitätsstrasse 2, 8092 Zurich, Switzerland.

No MeSH data available.


Root elongation parameters estimated from the models plotted for the no N and high N treated crown axile roots. The dashed, red line indicates the time point of solution change at 0 days after solution change (DASC).
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Figure 3: Root elongation parameters estimated from the models plotted for the no N and high N treated crown axile roots. The dashed, red line indicates the time point of solution change at 0 days after solution change (DASC).

Mentions: The development of elongation rates of the different root traits was plotted using R and appropriate models were chosen according to the shape of the developmental curves (Supplementary Figs S2−S4). For crown root elongation before solution change, a simple linear regression was fitted (Fig. 3, Slope 1). For crown roots growing in the compartment without N after solution change, a regression model with segmented relationships and one breakpoint was fitted using the function segmented() of the R-package segmented (Muggeo, 2003, 2008). The estimated parameters were the slope after solution change (Fig. 3, Slope 2), the time at which the breakpoint occurred and the new slope after this breakpoint (Fig. 3, Slope 3). For the high N roots after solution change, a simple logistic model of the form


High-resolution quantification of root dynamics in split-nutrient rhizoslides reveals rapid and strong proliferation of maize roots in response to local high nitrogen.

in 't Zandt D, Le Marié C, Kirchgessner N, Visser EJ, Hund A - J. Exp. Bot. (2015)

Root elongation parameters estimated from the models plotted for the no N and high N treated crown axile roots. The dashed, red line indicates the time point of solution change at 0 days after solution change (DASC).
© Copyright Policy - creative-commons
Related In: Results  -  Collection

License 1 - License 2
Show All Figures
getmorefigures.php?uid=PMC4585423&req=5

Figure 3: Root elongation parameters estimated from the models plotted for the no N and high N treated crown axile roots. The dashed, red line indicates the time point of solution change at 0 days after solution change (DASC).
Mentions: The development of elongation rates of the different root traits was plotted using R and appropriate models were chosen according to the shape of the developmental curves (Supplementary Figs S2−S4). For crown root elongation before solution change, a simple linear regression was fitted (Fig. 3, Slope 1). For crown roots growing in the compartment without N after solution change, a regression model with segmented relationships and one breakpoint was fitted using the function segmented() of the R-package segmented (Muggeo, 2003, 2008). The estimated parameters were the slope after solution change (Fig. 3, Slope 2), the time at which the breakpoint occurred and the new slope after this breakpoint (Fig. 3, Slope 3). For the high N roots after solution change, a simple logistic model of the form

Bottom Line: This may be a desirable trait in breeding programmes, since it decreases NO3(-) leaching and N2O emission.By contrast, laterals on the side without N did not show any detectable elongation beyond the first day after their emergence.We conclude that split-nutrient rhizoslides have great potential to improve our knowledge about nitrogen responsiveness and selection for contrasting genotypes.

View Article: PubMed Central - PubMed

Affiliation: Department of Experimental Plant Ecology, Radboud University Nijmegen, Heijendaalseweg 135, 6525 AJ Nijmegen, The Netherlands Crop Science, Swiss Federal Institute of Technology Zurich, Universitätsstrasse 2, 8092 Zurich, Switzerland.

No MeSH data available.