Effects of Mercuric Chloride on the Hydraulic Conductivity of Tomato Root Systems (Evidence for a Channel-Mediated Water Pathway) | Zendy

Albino Maggio | Zendy; Robert J. Joly | Zendy

Open Access

Effects of Mercuric Chloride on the Hydraulic Conductivity of Tomato Root Systems (Evidence for a Channel-Mediated Water Pathway)

Author(s) -

Albino Maggio,

Robert J. Joly

Publication year - 1995

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.109.1.331

Subject(s) - xylem , lycopersicon , hydraulic conductivity , exudate , chemistry , chloride , water transport , water flow , chloride channel , flux (metallurgy) , conductivity , solanaceae , botany , biophysics , horticulture , biology , biochemistry , soil science , soil water , environmental science , organic chemistry , gene , ecology

A pressure-flux approach was used to evaluate the effects of HgCl2 on water transport in tomato (Lycopersicon esculentum) roots. Addition of HgCl2 to a root-bathing solution caused a large and rapid reduction in pressure-induced root water flux; the inhibition was largely reversible upon addition of [beta]-mercaptoethanol. Root system hydraulic conductivity was reduced by 57%. There was no difference between treatments in the K+ concentration in xylem exudate. The results are consistent with the presence of a protein-mediated path for transmembrane water flow in tomato roots.

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