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Berger A, Oren R, Schulze ED. Element concentrations in the xylem sap of Picea abies (L.) Karst. seedlings extracted by various methods under different environmental conditions. Tree Physiol. 1994;14(2):111-28doi: 10.1093/treephys/14.2.111.
Berger, A., Oren, R., & Schulze, E. D. (1994). Element concentrations in the xylem sap of Picea abies (L.) Karst. seedlings extracted by various methods under different environmental conditions. Tree physiology, 14(2), 111-28. https://doi.org/10.1093/treephys/14.2.111
Berger, A, et al. "Element concentrations in the xylem sap of Picea abies (L.) Karst. seedlings extracted by various methods under different environmental conditions." Tree physiology vol. 14,2 (1994): 111-28. doi: https://doi.org/10.1093/treephys/14.2.111
Berger A, Oren R, Schulze ED. Element concentrations in the xylem sap of Picea abies (L.) Karst. seedlings extracted by various methods under different environmental conditions. Tree Physiol. 1994 Feb;14(2):111-28. doi: 10.1093/treephys/14.2.111. PMID: 14967707.
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Tree Physiol. 1994 Feb;14(2):111-28. doi: 10.1093/treephys/14.2.111.

Element concentrations in the xylem sap of Picea abies (L.) Karst. seedlings extracted by various methods under different environmental conditions.

Tree physiology

A Berger, R Oren, E D Schulze

Affiliations

  1. Universität Bayreuth, Lehrstuhl Pflanzenökologie, Universitätsstrasse 30, 95440 Bayreuth, FRG.

PMID: 14967707 DOI: 10.1093/treephys/14.2.111

Abstract

We used a Scholander pressure chamber to assess the effects of various extraction methods under different environmental conditions on element concentrations in xylem sap of 3-year-old Picea abies (L.) Karst. seedlings. Sap from excised shoots contained higher element concentrations when extracted at low than at high over-pressures. When comparing plants differing in water status, we found that a high extraction over-pressure introduced a systematic error into the data. For example, in well-watered non-transpiring plants relative to unwatered transpiring plants, potassium concentrations were 70% higher in sap extracted at 0.1 MPa over-pressure, but only 10% higher in sap extracted at 1.0 MPa over-pressure. Moreover, treatment effects depended on the time of day when the sap was extracted. Increased water flux in transpiring plants relative to non-transpiring plants resulted in reduced xylem sap element concentrations when samples were collected after 9 h of transpiration, but not after 4 to 6 h of transpiration. Drought had little effect on xylem sap element concentrations, indicating that rates of element release into xylem conduits, element depletion by growing tissues, and water flow maintained a balance that may prevent nutrient stress during short-term drought.

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