%0 Journal Article %1 aasamaaetal_01 %A Aasamaa, K. %A Sober, A. %A Rahi, M. %D 2001 %J Australian Journal of Plant Physiology %K bibtex-import citeulikeExport %P 765--774 %T Leaf anatomical characteristics associated with shoot hydraulic conductance, stomatal conductance and stomatal sensitivity to changes of leaf water status in temperate deciduous trees %V 28 %X Some anatomical characteristics in leaves relating to hydraulic conductance and stomatal conductance were examined in six temperate deciduous tree species. The fourth power of the radius of the conducting elements in xylem (r4) and the area of mesophyll and epidermal cells per unit length of leaf cross-section (u) were high in leaves with high hydraulic conductance (L). Stomatal conductance (gs) and stomatal sensitivity to an increase in leaf water potential (si) correlated positively with the length of stomatal pore (l), but negatively with the guard cell width (z) and the length of the dorsal side of the guard cells (ld). Stomatal sensitivity to a decrease in leaf water potential (sd) correlated negatively with l and positively with z and ld. The anatomical characteristics associated with hydraulic conductance (r4 and u) and those associated with stomatal conductance and sensitivity to changes of leaf water potential (l, z and ld) were correlated. We conclude that hydraulic conductance may depend on anatomical characteristics of xylem, mesophyll and epidermis, and stomatal conductance and its sensitivity to changing water potential may depend on anatomical characteristics of stomata. The correlation of shoot hydraulic conductance with stomatal conductance and its sensitivity may be based largely on the correlation between the anatomical characteristics of the water conducting system and stomata in these trees.

@article{aasamaaetal_01, abstract = {{Some anatomical characteristics in leaves relating to hydraulic conductance and stomatal conductance were examined in six temperate deciduous tree species. The fourth power of the radius of the conducting elements in xylem (r4) and the area of mesophyll and epidermal cells per unit length of leaf cross-section (u) were high in leaves with high hydraulic conductance (L). Stomatal conductance (gs) and stomatal sensitivity to an increase in leaf water potential (si) correlated positively with the length of stomatal pore (l), but negatively with the guard cell width (z) and the length of the dorsal side of the guard cells (ld). Stomatal sensitivity to a decrease in leaf water potential (sd) correlated negatively with l and positively with z and ld. The anatomical characteristics associated with hydraulic conductance (r4 and u) and those associated with stomatal conductance and sensitivity to changes of leaf water potential (l, z and ld) were correlated. We conclude that hydraulic conductance may depend on anatomical characteristics of xylem, mesophyll and epidermis, and stomatal conductance and its sensitivity to changing water potential may depend on anatomical characteristics of stomata. The correlation of shoot hydraulic conductance with stomatal conductance and its sensitivity may be based largely on the correlation between the anatomical characteristics of the water conducting system and stomata in these trees.}}, added-at = {2019-03-31T01:14:40.000+0100}, author = {Aasamaa, K. and Sober, A. and Rahi, M.}, biburl = {https://www.bibsonomy.org/bibtex/2cfbea130e81ab6f4a70ccbae098a0d9e/dianella}, citeulike-article-id = {1523580}, comment = {(private-note)r4 The hydraulic conductance of xylem conducting elements in roots is several orders of magnitude higher than that of the root parenchymal tissues (Steudle et al. 1987; Frensch and Steudle 1989; Melchior and Steudle 1993; Steudle and Peterson 1998; Rieger and Litvin 1999). In leaves the diameter of the xylem conducting elements is noticeably smaller than that in the root metaxylem (Esau 1965; Zimmermann and Brown 1971; Zimmermann 1983). ***good reason to believe the site of resistance isn't the roots? Explains why the use of stomatal pore index Our earlier study (Aasamaa and S\"{i}¿½er 2001) showed that hydraulic conductance (determining the rate of leaf water uptake) and stomatal conductance and sensitivity (determining the rate of leaf water loss) are associated; The diameter of the three widest conducting elements in the xylem of the central vein were measured The length of the cross-section, the leaf thickness, the area of the veins, mesophyll cells, intercellular spaces and epidermal cells were measured Dry mass per leaf area was determined Usually, r4 was higher in the trees grown in nitrogen-rich soil and lower in the trees grown under mild water stress (compared with the trees of the control set of each species; r4 correlated positively with hydraulic conductance of the shoot (L) mesophyll cell area per leaf width corellated strongly with L as well The area of veins per unit length of leaf cross-section was higher in A. platanoides and T. cordata than in the other species and also higher in the trees grown under mild water stress than in the well-watered trees (Fig. 2b). Only the area of the intercellular spaces varied among species, but did not correlate with the hydraulic conductance (data not shown). ****hothamensis has a greater intercellular space than foliosa!!!}, interhash = {fd2027461ef857a9e2559e4eb786cb7c}, intrahash = {cfbea130e81ab6f4a70ccbae098a0d9e}, journal = {Australian Journal of Plant Physiology}, keywords = {bibtex-import citeulikeExport}, pages = {765--774}, posted-at = {2007-07-31 05:55:23}, priority = {2}, timestamp = {2019-03-31T01:16:26.000+0100}, title = {{Leaf anatomical characteristics associated with shoot hydraulic conductance, stomatal conductance and stomatal sensitivity to changes of leaf water status in temperate deciduous trees}}, volume = 28, year = 2001 }