Leaf anatomical characteristics associated with shoot hydraulic conductance, stomatal conductance and stomatal sensitivity to changes of leaf water status in temperate deciduous trees
Leaf anatomical characteristics associated with shoot hydraulic conductance, stomatal conductance and stomatal sensitivity to changes of leaf water status in temperate deciduous trees
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DOI：
10.1071/pp00157
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发表时间：
2001-01-01
期刊：
影响因子：
--
通讯作者：
Rahi, M
中科院分区：
文献类型：
--
作者：
Aasamaa, K;Sober, A;Rahi, M
研究了6种温带落叶树种叶片与导水率和气孔导度相关的解剖学特征。导水率（L）高的叶片，木质部导水元件半径的四次方（r（4））和单位叶长的叶肉细胞和表皮细胞面积（u）高。气孔导度（g（s））和气孔对叶水势增加的敏感性（s（i））与气孔长度（l）呈正相关，与保卫细胞宽度（z）和保卫细胞背侧长度（l（d））呈负相关。气孔对叶水势下降的敏感性（s（d））与l呈负相关，与z和l（d）呈正相关。与水力导度相关的解剖特征（r（4）和u）与气孔导度和对叶水势变化敏感性相关的解剖特征（l，z和l（d））相关。结果表明，导水率可能取决于木质部、叶肉和表皮的解剖特征，气孔导度及其对水势变化的敏感性可能取决于气孔的解剖特征。气孔导度与枝条导度的相关性及其敏感性可能主要是基于这些树木的导水系统和气孔的解剖特征之间的相关性。
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 (r(4)) 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 (g(s)) and stomatal sensitivity to an increase in leaf water potential (s(i)) 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 (l(d)). Stomatal sensitivity to a decrease in leaf water potential (s(d)) correlated negatively with l and positively with z and l(d). The anatomical characteristics associated with hydraulic conductance (r(4) and u) and those associated with stomatal conductance and sensitivity to changes of leaf water potential (l, z and l(d)) 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.