The shade avoidance syndrome: A non-markovian stochastic growth model

Andrea Veglio (1, 2)

1 Department of Oncological Sciences and Division of Vascular Biology
2 National Inter-University Consortium for the Physical Sciences of Matter (CNISM)

Plants at high population density compete for light, showing a series of physiological responses known as the shade avoidance syndrome. These responses are controlled by the synthesis of the hormone auxin, which is regulated by two signals, an environmental one and an internal one. Considering that the auxin signal induces plant growth after a time lag, this work shows that plant growth can be modelled in terms of an energy-like function extremization, provided that the Markov property is not applied. The simulated height distributions are bimodal and right skewed, as in real community of plants. In the case of isolated plants, theoretical growth dynamics and speed correctly fit experimental data reported in literature. Moreover, the growth dynamics of this model is shown to be consistent with the biomass production function of an independent model. These results suggest that memory effects play a non-negligible role in plant growth processes.

Mots clés: Auxin; Hormone ethylene; Height distributions; Bimodality; Plant growth dynamics; Arabidopsis thaliana; Biomass production; Ising model; Langevin equation

Andrea Veglio. The shade avoidance syndrome: A non-markovian stochastic growth model. Journal of Theoretical Biology, 2010, 264 (3), pp.722. ⟨10.1016/j.jtbi.2010.02.039⟩. ⟨hal-00591230⟩