A Model Relating Root Permeability to Flux and Potentials | Zendy

Burlyn E. Michel | Zendy

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A Model Relating Root Permeability to Flux and Potentials

Author(s) -

Burlyn E. Michel

Publication year - 1977

Publication title -

plant physiology

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 3.554

H-Index - 312

eISSN - 1532-2548

pISSN - 0032-0889

DOI - 10.1104/pp.60.2.259

Subject(s) - permeability (electromagnetism) , flux (metallurgy) , hydraulic conductivity , soil science , chemistry , environmental science , mechanics , biological system , physics , biology , soil water , membrane , biochemistry , organic chemistry

A model that relates hydraulic permeability to water flux and to gradients in pressure potential and solute potential was tested using soybean (Glycine max) plants. Water flux was varied by additions of polyethylene glycol 6,000 around one portion of a divided root system and by changing the light intensity and CO(2) concentration around the plants. The data are compatible with the model only if the hydraulic permeability varies with flux; however, the data were insufficient for rigorous testing. Three sets of published data fit the model only if hydraulic permeability varies. Evidence originally presented as involving constant hydraulic permeability is shown, rather, to require variable hydraulic permeability.

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