Evidence for xylem embolism as a primary factor in dehydration-induced declines in leaf hydraulic conductance
نویسندگان
چکیده
منابع مشابه
Outside-Xylem Vulnerability, Not Xylem Embolism, Controls Leaf Hydraulic Decline during Dehydration.
Leaf hydraulic supply is crucial to maintaining open stomata for CO2 capture and plant growth. During drought-induced dehydration, the leaf hydraulic conductance (Kleaf) declines, which contributes to stomatal closure and, eventually, to leaf death. Previous studies have tended to attribute the decline of Kleaf to embolism in the leaf vein xylem. We visualized at high resolution and quantified ...
متن کاملLeaf xylem embolism, detected acoustically and by cryo-SEM, corresponds to decreases in leaf hydraulic conductance in four evergreen species.
Hydraulic conductance of leaves (K(leaf)) typically decreases with increasing water stress. However, the extent to which the decrease in K(leaf) is due to xylem cavitation, conduit deformation or changes in the extra-xylary pathway is unclear. We measured K(leaf) concurrently with ultrasonic acoustic emission (UAE) in dehydrating leaves of two vessel-bearing and two tracheid-bearing species to ...
متن کاملA method for measuring xylem hydraulic conductance and embolism in entire root and shoot systems
Current methods for determining the influence of xylem cavitation on hydraulic conductance are limited to unbranched stem or root segments with hydraulic conductances above c. 2 mmol s~ MPa . Lower conductances and/or highly branched systems are encountered in seedlings, arid-land shrubs, herbs, and distal portions of shoot and root systems of trees. In order to quantify the hydraulic impact of...
متن کاملA method for measuring hydraulic conductivity and embolism in xylem
Hydraulic conductivity of the xylem is computed as the quotient of mass fiow rate and pressure gradient. Measurements on excised plant stems can be difficult to interpret because of timedependent reductions in fiow rate, and because of variable degrees of embolism. Using Acer saccharum Marsh, stems, we found that certain perfusing solutions including dilute fixatives (e.g. 0.05% formaldehyde) a...
متن کاملOutside-Xylem Vulnerability, Not Xylem Embolism, Controls Leaf Hydraulic Decline during Dehydration1[CC-BY]
Department of Ecology and Evolutionary Biology, University of California, Los Angeles, California, 90095 (C.S., S.V.T., G.P.J., M.K.B., L.S.); Department of Biology, Utah State University, Logan, Utah 84322 (C.S.); Department of Viticulture and Enology, University of California, Davis, California 95616 (C.A., A.J.M.); School of Forestry and Environmental Studies, Yale University, New Haven, Con...
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ژورنال
عنوان ژورنال: Plant, Cell & Environment
سال: 2011
ISSN: 0140-7791
DOI: 10.1111/j.1365-3040.2011.02449.x