Hydraulic constraints to stomatal conductance in flooded trees.

ABSTRACT: Stomatal closure is a pervasive response among trees exposed to flooded soil. We tested whether this response is caused by reduced hydraulic conductance in the soil-to-leaf hydraulic continuum (k_total), and particularly by reduced root hydraulic conductance (k_root), which has been widely hypothesized. We tracked stomatal conductance at the leaf level (g_s) and canopy scale (G_s) along with physiological conditions in two temperate tree species, Magnolia grandiflora and Quercus virginiana, that were subjected to flood and control conditions in a greenhouse experiment. Flooding reduced g_s, G_s, k_root and k_total. Path analysis showed strong support for direct effects of k_total on g_s and

SUBMITTER: Brennan MJ 

PROVIDER: S-EPMC12423221 | biostudies-literature | 2025 Sep

REPOSITORIES: biostudies-literature