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Morphological Differences in Response to Physiological Integration and Spatial Heterogeneity of Root Zone Glyphosate Exposure in Connected Ramets of Ludwigia peploides (Creeping Water Primrose)

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Abstract

The effects of applying glyphosate to the root zone of one of a pair of connected ramets were investigated. In the low root density (LRD) treatment, daughter ramet roots were exposed to 100 mL of 10 mg L−1 glyphosate, while in the high root density (HRD) treatment, mother ramet roots were exposed to the same glyphosate solution. These treatments were compared to unexposed controls. The morphologies (leaf and shoot numbers) of control and HRD treatments were identical. In these treatments, daughter ramets had greater numbers of leaves and shoots than mother ramets. The morphology of the LRD treatment was opposite: mother ramets had more leaves and shoots than daughter ramets. Growth parameters were unaffected by glyphosate exposure except for relative growth rate, which was significantly greater for the HRD treatment. This study provides insights about the responses of clonal plants to physiological integration and spatially heterogeneous environmental stressors.

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Acknowledgments

The authors are grateful to The University of Memphis Department of Biological Sciences for providing space and support to carry out this study. The assistance of Dr. Melissa Koontz and Dr. Samuel Pierce is greatly appreciated.

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The authors declare that they have no conflict of interest.

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  1. Department of Biological Sciences, University of Memphis, 3700 Walker Avenue, Memphis, TN, 38152, USA

    Lyndsay E. Saunders & Reza Pezeshki

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  1. Lyndsay E. Saunders
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  2. Reza Pezeshki
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Correspondence to Lyndsay E. Saunders.

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Saunders, L.E., Pezeshki, R. Morphological Differences in Response to Physiological Integration and Spatial Heterogeneity of Root Zone Glyphosate Exposure in Connected Ramets of Ludwigia peploides (Creeping Water Primrose). Water Air Soil Pollut 226, 171 (2015). https://doi.org/10.1007/s11270-015-2435-1

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  • DOI: https://doi.org/10.1007/s11270-015-2435-1

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