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Protein Metabolism
Reduced nitrogen in mesophyll cells of C3-plants is present mainly in the
chloroplasts and stromal proteins represent the most relevant nitrogen
fraction within the chloroplasts. Proteins cannot be exported as such via
the phloem
and must therefore be degraded prior to the export of this nitrogen
from leaves to other parts of the same plant.
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Metal
Transport
The mobility of nutrients, assimilates and pollutants in the phloem
varies in a wide range. Radionuclides are often used to investigate
transport processes on the whole plant level.
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Physiological limitations at elevated temperatures and under drought
On the level of individual plants, climate factors (temperature,
CO2 concentration in the ambient air, water relations) influence
growth and productivity in a complex manner. Photosynthesis, nutrient
and assimilate allocation as well as the senescence pattern are affected
by the climate. Such effects may influence the competition between
species in a natural population and the productivity of crop plants.
elevated temperature...
drought...
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The integration of processes on the subcellular level
in the physiology of the whole plant is an important aspect of our
research. Biochemical investigations with isolated organelles (e.g.
chloroplasts) and field experiments with intact crop plants represent
complementary approaches to elucidate the regulatory network. The
redistribution of nutrients and assimilates is relevant for an efficient
use of nutrients by crop plants and for the quality of plant products.
Details of our work during the past few years are documented in the
publications.
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