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

AUTOR(ES)

Maggio, A.

RESUMO

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.

Documentos Relacionados

• Transepithelial water permeability in microperfused distal airways. Evidence for channel-mediated water transport.
• Cholangiocytes express the aquaporin CHIP and transport water via a channel-mediated mechanism.
• Mercuric Chloride Effects on Root Water Transport in Aspen Seedlings1
• Channel-mediated high-affinity K+ uptake into guard cells from Arabidopsis
• Permeability and Channel-Mediated Transport of Boric Acid across Membrane Vesicles Isolated from Squash Roots1