Poster: Root Biology
Abs #
527: Mathematical-model-assisted analysis of root growth in Arabidopsis thaliana
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Presenter: |
Iwamoto, Akitoshi , akitoshi@um.u-tokyo.ac.jp |
Authors | Iwamoto, Akitoshi (A) Satoh, Daisuke (A) Furutani, Masahiko (A) Maruyama, Shinichiro (A) Sugiyama, Munetaka (A) | | Affiliations: |
(A): Botanical Gardens, Graduate School of Science, The University of Tokyo
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Spatial patterns of cell proliferation and elongation involved in the axial growth of plant organs have been analyzed kinematically in recent years. Results obtained through these analyses suggest relationship between cell proliferation and elongation growth, which has not yet been formulated. Here, we present a simple mathematical model that can link cell proliferation and elongation growth, and its application to the axial growth of the primary root of Arabidopsis thaliana. This model assumes that a plant organ has a capacity of biological activity (gcapitalh) proportionally dependent on a cell number and invests the capital in cell proliferation, growth (increase in volume), and/or maintenance. The assumption is described by a differential equation, which contains parameters indicating costs for these three terms of the organ growth. We exploited the mathematical model to analyze data sets of spatial profiles of cortical cell length and growth velocity field in the primary root of A. thaliana and to obtain the growth parameters. Additionally, we calculated local cell production rates (LCPR) and relative elementary growth rates (REGR). All the results were taken together to characterize the root growth.
