On the Efficacy of Water Transport in Leaves. A Coupled Xylem-Phloem Model of Water and Solute Transport.
On the Efficacy of Water Transport in Leaves. A Coupled Xylem-Phloem Model of Water and Solute Transport.
复制标题
DOI：
10.3389/fpls.2021.615457
复制
发表时间：
2021
影响因子：
5.6
通讯作者：
Miklavcic SJ
中科院分区：
文献类型：
--
作者：
Sakurai G;Miklavcic SJ
在本文中，我们提出并使用木质部/韧皮部耦合的数学模型，通过被子植物叶片的网状维管系统进行被动水和溶质运输。研究了叶片长宽比和二级叶脉取向对叶片水分输运和蔗糖输运指标的影响。结果表明，影响木质部水力分布和韧皮部溶质浓度稳态分布的最重要因素是叶片形状，在所有研究条件下，较窄/较长的叶片对木质部水分和韧皮部溶质的对流效率均低于较宽/较短的叶片。在考虑的所有叶片比例中，二级叶脉相对于主叶脉的方向对运输效率的影响很大；这种依赖关系是非单调的，当与主脉的角度约为45°时，效率最大化，尽管峰值效率的角度取决于其他条件。输送效率对静脉定向的敏感性随静脉电导率的增加而增加。在较窄的叶片中，效率最大的叶脉角（相对于主叶脉方向）往往较小。这些结果可能有助于解释，或者至少有助于我们理解单叶平行脉系统的进化。
In this paper, we present and use a coupled xylem/phloem mathematical model of passive water and solute transport through a reticulated vascular system of an angiosperm leaf. We evaluate the effect of leaf width-to-length proportion and orientation of second-order veins on the indexes of water transport into the leaves and sucrose transport from the leaves. We found that the most important factor affecting the steady-state pattern of hydraulic pressure distribution in the xylem and solute concentration in the phloem was leaf shape: narrower/longer leaves are less efficient in convecting xylem water and phloem solutes than wider/shorter leaves under all conditions studied. The degree of efficiency of transport is greatly influenced by the orientation of second-order veins relative to the main vein for all leaf proportions considered; the dependence is non-monotonic with efficiency maximized when the angle is approximately 45° to the main vein, although the angle of peak efficiency depends on other conditions. The sensitivity of transport efficiency to vein orientation increases with increasing vein conductivity. The vein angle at which efficiency is maximum tended to be smaller (relative to the main vein direction) in narrower leaves. The results may help to explain, or at least contribute to our understanding of, the evolution of parallel vein systems in monocot leaves.
登录
查看更多内容
影响因子：
2
作者：
Holtta, T.;Mencuccini, M.;Nikinmaa, E.
通讯作者：
Nikinmaa, E.
影响因子：
2
作者：
Foster, Kylie J.;Miklavcic, Stanley J.
通讯作者：
Miklavcic, Stanley J.
影响因子：
2.3
作者：
Hölttä, T;Vesala, T;Nikinmaa, E
通讯作者：
Nikinmaa, E
影响因子：
3
作者：
Lacointe, Andre;Minchin, Peter E. H.
通讯作者：
Minchin, Peter E. H.
影响因子：
6.2
作者：
Lhomme, JP;Rocheteau, A;Rambal, S
通讯作者：
Rambal, S