Generalized hydromechanical model for stomatal responses to hydraulic perturbations.
J Theor Biol
; 340: 119-30, 2014 Jan 07.
Article
em En
| MEDLINE
| ID: mdl-24060618
ABSTRACT
Stomata respond in a common pattern to various hydraulic perturbations on any part of the 'soil-plant-air' system initial transient 'wrong-way' responses and final stationary 'right-way' responses. In order to describe this pattern on the basis of statistical physics, we propose a simple model where turgor pressure of a cell is taken to be a power function of its volume, and obtain results in qualitative agreement with experimental data for responses to a variety of hydraulic perturbations Firstly, stationary stomatal conductance as a function of the vapor pressure deficit divides into three regimes characterized by sensitivities of the stomatal conductance and the transpiration rate with respect to vapor pressure deficit; secondly, for every hydraulic perturbation, the initial transient 'wrong-way' responses always appear; thirdly, on condition that water is supplied insufficiently, stomatal oscillations are often observed; finally, stomatal responses following leaf excision exhibit, after the initial transient wrong-way responses, slow relaxation to stomatal closing. In particular, comparison of areoles having different numbers of stomata demonstrates that areoles with small numbers of stomata tend to provoke lack of water in the soil as well as in the plant. In addition, our model also describes well dependence of the stomatal conductance on temperature. It may be extended further to describe stomatal responses to other environmental factors such as carbon dioxide, light, and temperature.
Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Transpiração Vegetal
/
Folhas de Planta
/
Estômatos de Plantas
Tipo de estudo:
Prognostic_studies
/
Qualitative_research
Idioma:
En
Revista:
J Theor Biol
Ano de publicação:
2014
Tipo de documento:
Article