Abstract
Background and aims
Despite the recognised importance of root architecture to plant productivity, our ability to easily observe and quantify root responses to stresses in soil at appropriate mechanistic resolution, remains poor. In this study we examine the impact of P bands on root architecture in heterogeneous soil, trialling a rapid non-destructive analysis technique.
Methods
We examined fast (<5 min), high resolution (69 μm voxels) x-ray tomography (μCT) to non-destructively observe and quantify wheat (Triticum aestivum L.) roots in a repacked Oxisol, in 3D, with and without a band of P-enriched soil.
Results
We found that wheat roots displayed localised responses (were plastic) and responded with additional root length within the banded P fertiliser. The seedling root systems also altered 3D root architecture in the band by increasing the number and length of branch roots. Branch root angle was not altered by the P band. The spatial precision of the branching response was striking and raises questions concerning the root sensing and/or response mechanisms.
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Acknowledgments
We thank G. Falzon for statistical advice and Kernel smoothing algorithm. This research was in part funded by The University of New England, the CSIRO OCE Postgraduate Scholarship, and the Grains Research and Development Corporation - Grains Industry Research Scholarship.
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Flavel, R.J., Guppy, C.N., Tighe, M.K. et al. Quantifying the response of wheat (Triticum aestivum L) root system architecture to phosphorus in an Oxisol. Plant Soil 385, 303–310 (2014). https://doi.org/10.1007/s11104-014-2191-9
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DOI: https://doi.org/10.1007/s11104-014-2191-9