Does calcium in xylem sap regulate stomatal conductance?
نویسندگان
چکیده
منابع مشابه
Is xylem sap calcium responsible for reducing stomatal conductance after soil
18 Understanding the regulation of calcium uptake, xylem transport and its impacts on growth and leaf 19 gas exchange is a subject that has received insufficient recent attention. Calcium (Ca) is unique 20 within the group of key elements required for plant growth in that it also has a role in cellular 21 signalling via regulation of changes in its cytoplasmic concentration. Its mobility, withi...
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We investigated the effect of drought on canopy stomatal conductance (g(c)), and examined the hypothesis that g(c) is controlled by the chemical messenger abscisic acid (ABA) produced in roots. Beginning in November 1994, we subjected a mature stand of Scots pine (Pinus sylvestris L.) to an imposed 11-month drought. Control plots were maintained at average-season soil water content. Xylem sap w...
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Stomatal conductance (g(s)) of pepper (Capsicum annuum L.) plants decreased during the second photoperiod (day 2) after withholding nitrate (N). Stomatal closure of N-deprived plants was not associated with a decreased shoot water potential (Psi(shoot)); conversely Psi(shoot) was lower in N-supplied plants. N deprivation transiently (days 2 and 3) alkalized (0.2-0.3 pH units) xylem sap exuded f...
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Xylem sap flow and environmental variables were measured on seven consecutive midsummer days in a 130-year-old Larix gmelinii (Rupr.) Rupr. forest located 160 km south of Yakutsk in eastern Siberia, Russia (61 degrees N, 128 degrees E, 300 m asl). The site received 20 mm of rainfall during the 4 days before measurements, and soil samples indicated that the trees were well watered. The tree cano...
متن کاملAnalyses of assumptions and errors in the calculation of stomatal conductance from sap flux measurements.
We analyzed assumptions and measurement errors in estimating canopy transpiration (E(L)) from sap flux (J(S)) measured with Granier-type sensors, and in calculating canopy stomatal conductance (G(S)) from E(L) and vapor pressure deficit (D). The study was performed in 12-year-old Pinus taeda L. stands with a wide range in leaf area index (L) and growth rate. No systematic differences in J(S) we...
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ژورنال
عنوان ژورنال: New Phytologist
سال: 1990
ISSN: 0028-646X,1469-8137
DOI: 10.1111/j.1469-8137.1990.tb00506.x