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Sulfur nutrition of deciduous trees
1Institut für Forstbotanik und Baumphysiologie, Albert-Ludwigs-Universität Freiburg, Georges-Köhler-Allee Gebäude 053/054, 79085 Freiburg, Germany. herschba@uni-freiburg.de
Die Naturwissenschaften
|March 23, 2001
Summary
Deciduous trees manage sulfur nutrition by cycling sulfate and reduced sulfur compounds between roots and shoots. This nutrient cycling is crucial for growth and is influenced by seasonal changes and tree growth patterns.
Area of Science:
- Plant Physiology
- Nutrient Transport
- Biochemistry
Background:
- Sulfur is an essential nutrient for plants, primarily taken up as sulfate.
- Deciduous trees reduce sulfate to sulfide for growth through assimilatory sulfate reduction.
- Sulfate and reduced sulfur are transported throughout the plant via xylem and phloem.
Purpose of the Study:
- To investigate the transport and storage of sulfur compounds in deciduous trees.
- To understand the regulation of sulfur nutrition in relation to plant growth.
- To explore the seasonal dynamics of sulfur cycling.
Main Methods:
- Tracking sulfate and glutathione (GSH) movement within plant tissues.
- Analyzing sulfur distribution in xylem and phloem.
- Correlating sulfur cycling with different tree growth patterns.
Main Results:
- Sulfate is transported to leaves, reduced, and surplus sulfur is transported back to roots via phloem.
- Sulfur compounds are stored in various parenchyma and cell types.
- A cycling pool of sulfur was observed primarily during seasonal transitions.
- The sulfate:glutathione ratio in phloem appears to regulate sulfur nutrition.
Conclusions:
- Deciduous trees exhibit complex sulfur cycling involving transport, reduction, storage, and remobilization.
- Seasonal changes significantly impact sulfur availability and transport dynamics.
- Understanding sulfur nutrition is vital for comprehending diverse deciduous tree growth patterns and responses to environmental factors.