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Plant Biol (Stuttg) 2001; 3(2): 132-138
DOI: 10.1055/s-2001-12898
Original Paper
Georg Thieme Verlag Stuttgart ·New York

Assimilate Transport in the Xylem Sap of Pedunculate Oak (Quercus robur) Saplings

U. Heizmann 1 , J. Kreuzwieser 1 , J.-P. Schnitzler 2 , N. Brüggemann 2 , and H. Rennenberg 1
  • 1 Institut für Forstbotanik und Baumphysiologie, Professur für Baumphysiologie, Freiburg i. B., Germany
  • 2 Fraunhofer Institut für Atmosphärische Umweltforschung, Garmisch-Partenkirchen, Germany
Further Information

Publication History

June 20, 2000

January 18, 2001

Publication Date:
31 December 2001 (online)

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Abstract

The rates of photosynthesis and transpiration, as well as the concentrations of organic compounds (total soluble non-protein N compounds [TSNN], soluble carbohydrates), in the xylem sap were determined during two growth seasons in one-year-old Quercus robur saplings. From the data, the total C gain of the leaves, by both photosynthesis and the transpiration stream, was calculated. Large amounts of C were allocated to the leaves by the transpiration stream; depending on the time of day and the environmental conditions the portion of C originating from xylem transport amounted to 8 to 91% of total C delivery to the leaves. Particularly under conditions of reduced photosynthesis, e.g., during midday depression of photosynthesis, a high percentage of the total C delivery was provided to the leaves by the transpiration stream (83 to 91 %). Apparently, attack by phloem-feeding aphids lowered the assimilate transport from roots to shoots; as a consequence the portion of C available to the leaves from xylem transport amounted to only 12 to 16 %. The most abundant organic compounds transported in the xylem sap were sugars (sucrose, glucose, fructose) with concentrations of ca. 50 to 500 μmol C ml-1, whereas C from N compounds was of minor significance (3 to 20 μmol ml-1 C). The results indicate a significant cycling of C in the plants because the daily transport of C with the transpiration stream exceeded the daily photosynthetic CO2 fixation in several cases. This cycling pool of C may sustain delivery of photosynthate to heterotrophic tissues, independent of short time fluctuations in photosynthetic CO2 fixation.

Key words

Organic carbon - carbon cycling - photosynthesis - transpiration - Quercus robur

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H. Rennenberg

Albert-Ludwigs-Universität Freiburg
Institut für Forstbotanik und Baumphysiologie
Professur für Baumphysiologie

Georges-Köhler-Allee, Geb. 053/054
79110 Freiburg i. B.
Germany

Email: here@uni-freiburg.de

Section Editor: U. Lüttge