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The present study investigated leaf water transport properties in trembling aspen ( Populus tremuloides ) leaves. Leaf lamina hydraulic conductance ( K  lam ) and stomatal conductance ( g  s ) were drastically suppressed by NaF (a general metabolic inhibitor). In leaves treated with 0.2 mM HgCl 2  (an aquaporin blocker),  K  lam  declined by 22% when the leaves were sampled in June but the decline was not significant when the leaves were sampled in August. The leaves sampled in June that transpired 30 mM β-mercaptoethanol following mercury application showed similar  K  lam  as those in control leaves transpiring distilled water. When leaves were pressure-infiltrated with 0.1 mM HgCl 2 ,  K  lam  significantly declined by 25%. Atrazine (a photosystem II inhibitor) drastically reduced leaf net CO 2  uptake by the leaves from seedlings and mature trees but did not have any effect on  K  lam  regardless of the irradiance at the leaf level during the  K  lam  measurements. When PTS 3  (trisodium 3-hydroxy-5,8,10-pyrenetrisulphonate) apoplastic tracer was pressure-infiltrated inside the leaves, its concentration in the leaf exudates did not change from ambient light to high irradiance treatment and declined in the presence of HgCl 2  in the treatment solution. Trembling aspen  K  lam  appears to be linked to leaf metabolism and is uncoupled from the short-term variations in photosynthesis. Aquaporin-mediated water transport does not appear to constitute the dominant pathway for the pressure-driven water flow in the leaves of trembling aspen trees.

Inhibitor studies of leaf lamina hydraulic conductance in trembling aspen ( Populus tremuloides Michx.) leaves