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Hydraulic Conductance And Mercury-Sensitive Water Transport For Roots Of Opuntia Acanthocarpa In Relation To Soil Drying And Rewetting, P. Martre, Gretchen North, P. Nobel
Hydraulic Conductance And Mercury-Sensitive Water Transport For Roots Of Opuntia Acanthocarpa In Relation To Soil Drying And Rewetting, P. Martre, Gretchen North, P. Nobel
Gretchen North
Drought-induced changes in root hydraulic conductance (L P) and mercury-sensitive water transport were examined for distal (immature) and mid-root (mature) regions ofOpuntia acanthocarpa. During 45 d of soil drying,L P decreased by about 67% for distal and mid-root regions. After 8 d in rewetted soil,L P recovered to 60% of its initial value for both regions. Axial xylem hydraulic conductivity was only a minor limiter of L P. Under wet conditions, HgCl2 (50 μM), which is known to block membrane water-transport channels (aquaporins), decreasedL P and the radial hydraulic conductance for the stele (L R, S) of the distal root …