Carbon cost of root systems: an architectural approach |
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| Authors: | Kai L Nielsen Jonathan P Lynch Andrei G Jablokow Peter S Curtis |
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| Institution: | (1) Department of Horticulture, The Pennsylvania State University, 16802 University Park, PA, USA;(2) Department of Mechanical Engineering, The Pennsylvania State University, 16802 University Park, PA, USA;(3) Department of Plant Biology, The Ohio State University, 43210 Columbus, OH, USA |
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| Abstract: | Root architecture is an important component of nutrient uptake and may be sensitive to carbon allocational changes brought
about by rising CO2. We describe a deformable geometric model of root growth, SimRoot, for the dynamic morphological and physiological simulation of root architectures. Using SimRoot, and measurements of root
biomass deposition, respiration and exudation, carbon/phosphorus budgets were developed for three contrasting root architectures.
Carbon allocation patterns and phosphorus acquisition efficiencies were estimated for Phaseolus vulgaris seedlings with either a dichotomous, herringbone, or empirically determined bean root architecture. Carbon allocation to
biomass, respiration, and exudation varied significantly among architectures. Root systems also varied in the relationship
between C expenditure and P acquisition, providing evidence for the importance of architecture in nutrient acquisition efficiency. |
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| Keywords: | carbon cost phosphorus Phaseolus vulgaris root architecture root growth root simulation model |
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