Owing to their size and longevity, trees are an interesting system for research on carbon partitoning and allocation with regard to both variations during the vegetation period and growth/development. Carbon allocation in plants is always from source (photosynthetically competent tissues) to sink (net importers of assimilates such as developing leaves or non-photosynthetic organs). We thus start our treatise with source leaves and follow down the line of assimilate flow via the trunk to the root system. Here we especially focus on the impact of symbiotic interactions on root carbohydrates and their metabolism.
Acknowledgements. As far as our own results are presented, we gratefully acknowledge financial support from the Deutsche Forschungsgemeinschaft, the Bundesminister fur Forschung und Technologie (EUROSILVA), the LandesforschungsfÖrderungsprogramm Baden-Württemberg, and the European Community.
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