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Stomatal response to drying soil in relation to changes in the xylem sap composition of Helianthus annuus. II.Stomatal sensitivity to abscisic acid imported from the xylem sap

Title data

Schurr, Ulrich ; Gollan, Thomas ; Schulze, Ernst-Detlef:
Stomatal response to drying soil in relation to changes in the xylem sap composition of Helianthus annuus. II.Stomatal sensitivity to abscisic acid imported from the xylem sap.
In: Plant, Cell & Environment. Vol. 15 (June 1992) Issue 5 . - pp. 561-567.
ISSN 1365-3040
DOI: https://doi.org/10.1111/j.1365-3040.1992.tb01489.x

Official URL: Volltext

Project information

Project financing: Deutsche Forschungsgemeinschaft

Abstract in another language

Sunflower plants (Helianthus annuus L.) were subjected to soil drying with their shoots either kept fully turgid using a Passioura-type pressure chamber or allowed to decrease in water potential. Whether the shoots were kept turgid or not, leaf conductance decreased below a certain soil water content. During the soil drying, xylem sap samples were taken from individual intact and transpiring plants. Xylem sap concentrations of nitrate and phosphate decreased with soil water content, whereas the concentrations of the other anions (SO42 and Cl−) remained unaltered. Calcium concentrations also decreased. Potassium, magnesium, manganese and sodium concentrations stayed constant during soil drying. In contrast, the pH, the buffering capacity at a pH below 5 and the cation/anion ratio increased after soil water content was lowered below a certain threshold. Amino acid concentration of the xylem sap increased with decreasing soil water content. The effect of changes in ion concentrations in the xylem sap on leaf conductance is discussed.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: BAYCEER7036
Keywords: Helianthus annuus L; Compositae; sunflower; water stress; root-to-shoot communication; xylem sap; ionic composition; amino acid; pH; buffering capacity
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Biology > Chair Plant Ecology
Research Institutions > Research Centres > Bayreuth Center of Ecology and Environmental Research- BayCEER
Research Institutions > Collaborative Research Centers, Research Unit > SFB 137 Gesetzmäßigkeiten und Strategien des Stoffumsatzes in ökologischen Systemen
Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Biology
Research Institutions
Research Institutions > Research Centres
Research Institutions > Collaborative Research Centers, Research Unit
Result of work at the UBT: Yes
DDC Subjects: 500 Science
500 Science > 580 Plants (Botany)
Date Deposited: 20 May 2015 10:49
Last Modified: 20 May 2015 10:49
URI: https://eref.uni-bayreuth.de/id/eprint/13891