NDLI: Cell-to-cell pathway dominates xylem-epidermis hydraulic connection in Tradescantia fluminensis (Vell. Conc.) leaves

Content Provider	Springer Nature Link
Author	Ye, Qing Holbrook, N. Michele Zwieniecki, Maciej A.
Copyright Year	2008
Abstract	A steady supply of water is indispensable for leaves to fulfil their photosynthetic function. Understanding water movement in leaves, especially factors that regulate the movement of water flux from xylem to epidermis, requires that the nature of the transport pathway be elucidated. To determine the hydraulic linkage between xylem and epidermis, epidermal cell turgor pressure (P t) in leaves of Tradescantia fluminensis was monitored using a cell pressure probe in response to a 0.2 MPa step change in xylem pressure applied at the leaf petiole. Halftime of P t changes $$ {\left( {T^{x}_{{1/2}} } \right)} $$ were 10–30 times greater than that of water exchange across an individual cell membrane $$ {\left( {T^{m}_{{1/2}} } \right)}, $$ suggesting that cell-to-cell water transport constitutes a significant part of the leaf hydraulic path from xylem to epidermis. Furthermore, perfusion of H2O2 resulted in increases of both $$ T^{m}_{{1/2}} $$ and $$ T^{x}_{{1/2}} $$ by a factor of 2.5, indicating that aquaporins may play a role in the xylem to epidermis hydraulic link. The halftime for water exchange $$ {\left( {T^{m}_{{1/2}} } \right)} $$ did not differ significantly between cells located at the leaf base (2.5 s), middle (2.6 s) and tip (2.5 s), indicating that epidermal cell hydraulic properties are similar along the length of the leaf. Following the pressure application to the xylem (0.2 MPa), P t changed by 0.12, 0.06 and 0.04 MPa for epidermal cells at the base, middle and the tip of the leaf, respectively. This suggests that pressure dissipation between xylem and epidermis is significant, and that the pressure drop along the vein may be due to its structural similarities to a porous pipe, an idea which was further supported by measurements of xylem hydraulic resistance using a perfusion technique.
Starting Page	1311
Ending Page	1319
Page Count	9
File Format	PDF
ISSN	00320935
Journal	Planta
Volume Number	227
Issue Number	6
e-ISSN	14322048
Language	English
Publisher	Springer-Verlag
Publisher Date	2008-02-14
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Aquaporins Epidermis Leaf hydraulics Porous vein Pressure probe Xylem Forestry Ecology Agriculture Plant Sciences
Content Type	Text
Resource Type	Article
Subject	Genetics Plant Science

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