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Tytuł pozycji:

Persistent decay of fresh xylem hydraulic conductivity varies with pressure gradient and marks plant responses to injury.

Tytuł :
Persistent decay of fresh xylem hydraulic conductivity varies with pressure gradient and marks plant responses to injury.
Autorzy :
Bonetti, Sara
Breitenstein, Daniel
Fatichi, Simone
Domec, Jean‐Christophe
Or, Dani
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Temat :
XYLEM
HYDRAULIC conductivity
PLANT injuries
VASCULAR system of plants
LAND-atmosphere interactions
TREE mortality
Źródło :
Plant, Cell & Environment; Feb2021, Vol. 44 Issue 2, p371-386, 16p
Czasopismo naukowe
Defining plant hydraulic traits is central to the quantification of ecohydrological processes ranging from land‐atmosphere interactions, to tree mortality and water‐carbon budgets. A key plant trait is the xylem specific hydraulic conductivity (Kx), that describes the plant's vascular system capacity to transport water. While xylem's vessels and tracheids are dead upon maturity, the xylem is neither inert nor deadwood, various components of the sapwood and surrounding tissue remaining alive and functional. Moreover, the established definition of Kx assumes linear relations between water flux and pressure gradient by tacitly considering the xylem as a "passive conduit". Here, we re‐examine this notion of an inert xylem by systematically characterizing xylem flow in several woody plants using Kx measurements under constant and cyclic pressure gradients. Results show a temporal and pressure gradient dependence of Kx. Additionally, microscopic features in "living branches" are irreversibly modified upon drying of the xylem, thus differentiating the macroscopic definition of Kx for living and dead xylem. The findings highlight the picture of the xylem as a complex and delicate conductive system whose hydraulic behaviour transcends a passive gradient‐based flow. The study sheds new light on xylem conceptualization, conductivity measurement protocols, in situ long‐distance water transport and ecosystem modelling. Xylem flow measurements using freshly cut branches show temporal and pressure‐dependent decrease in xylem hydraulic conductivity with active wound response of living xylem tissue. Results have notable implications for plant water relations and xylem conceptualization as a complex living system. [ABSTRACT FROM AUTHOR]
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