Fluid ionic composition influences hydraulic conductance of xylem conduits
نویسندگان
چکیده
منابع مشابه
Tapered conduits can buffer hydraulic conductance from path-length effects.
The model of West, Brown and Enquist showed that total hydraulic resistance in trees can be independent of path length, provided that vascular conduits taper sufficiently. This model assumes that the tree branch network is volume-filling, so that segment lengths increase exponentially from tree top to base. We show that partial buffering of hydraulic resistance from path-length effects can occu...
متن کاملXylem cavitation and loss of hydraulic conductance in western
erophylla (Raf.) Sarg.) seedlings experience water stress and declining xylem pressure potential (Ψx). Low Ψx can result in xylem cavitation and embolism formation, causing a decline in hydraulic conductance. This study focused on the relationship between Ψx, xylem cavitation and transpiration (E) of newly planted seedlings. Leaf specific hydraulic conductance (kAB) declined from 0.56 to 0.09 m...
متن کاملTapering of xylem conduits and hydraulic limitations in sycamore (Acer pseudoplatanus) trees.
Vertical conduit tapering is proposed as an effective mechanism to almost eliminate the increase in hydraulic resistance with increased height. Despite this potential role, very little is known about its changes during ontogeny. Here, conduit tapering and stem morphology of young/small and old/tall individuals of Acer pseudoplatanus in the field, as well as 3-yr-old grafted trees from both age ...
متن کاملTesting for ion-mediated enhancement of the hydraulic conductance of the leaf xylem in diverse angiosperms
Replacing ultra-pure water solution with ion solution closer to the composition of natural xylem sap increases stem hydraulic conductance by up to 58%, likely due to changes in electroviscosity in the pit membrane pores. This effect has been proposed to contribute to the control of plant hydraulic and stomatal conductance and potentially to influence on carbon balance during dehydration. Howeve...
متن کاملRelationships between xylem vessel characteristics, calculated axial hydraulic conductance and size-controlling capacity of peach rootstocks.
BACKGROUND AND AIMS Previous studies indicate that the size-controlling capacity of peach rootstocks is associated with reductions of scion water potential during mid-day that are caused by the reduced hydraulic conductance of the rootstock. Thus, shoot growth appears to be reduced by decreases in stem water potential. The aim of this study was to investigate the mechanism of reduced hydraulic ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Journal of Experimental Botany
سال: 2000
ISSN: 1460-2431,0022-0957
DOI: 10.1093/jexbot/51.345.769