Dr Claudia Keitel

Lecturer, Department of Environmental Sciences

C02F - Centre for Carbon, Water and Food
The University of Sydney

Telephone +61 2 9351 8885
Fax +61 2 8627 1099

Biographical details

Claudia studied biology at the Albert-Ludwigs-University in Freiburg and developed an interest in physiology during her undergraduate studies. In 1996, she went to the Botany Department at the University of Otago, New Zealand, to complete a Postgraduate Diploma of Science on the ÔModification of Crassulacean Acid Metabolism in Disphyma australeÕ. During her time in NZ she started to work with stable isotopes, with her supervisor Peter Bannister at the Botany Department. After returning to Freiburg, she completed her Biologie Diplom (Masters) using molecular techniques, looking at ÔMolecular and physiological investigation of putative response regulators in Arabidopsis thaliana. She returned to working with isotopes during her PhD, during which she travelled between Freiburg and Otago Universities looking at stable isotopes of tree species in the Northern and Southern Hemispheres along environmental gradients, supervised by Dr. Arthur Gessler, Prof. Heinz Rennenberg and Prof. Peter Bannister. She completed her PhD at Freiburg University in January 2004 on ÔIsotope Signatures (_13, _18O, _15N) as a Measure of Environmental Effects on the Physiology of Trees in the Northern and Southern HemispheresÕ. Her first Postdoctoral Fellowship was at the former Research School of Biological Sciences, Australian National University, working with Prof. Graham Farquhar and Dr. Hilary Stuart-Williams and other members of the Environmental Biology group on stable isotopes in leaf water, phloem and leaf components and developing techniques for IRMS measurements. Her second Postdoctoral Fellowship was at the University of New South Wales with Prof. Mark Adams and his group working on the physiology and water use of Eucalyptus in the Pilbara. In November 2008, she moved to the University of Sydney.

Research interests

My research involves looking at the isotopic composition of plant parts (e.g. leaves, wood, roots), different pools within the plant (e.g. sugars, leaf water) and the surrounding environment. Almost every element has one or more stable isotopes and the main elements of interest in my research are carbon, nitrogen, oxygen and hydrogen. The carbon isotope signature for instance can be used to see whether plants were water stressed or light-limited during growth and also can give an indication of their water use efficiency. I am generally interested in fractionation events after photosynthetic fixation (post-photosynthetic fractionation), e.g. during metabolic conversion and transport. I am also interested in the fractionation during evaporation and transpiration from leaves and how the oxygen and hydrogen isotopic signature of different pools of water in the plant are affected (e.g. soil, xylem and leaf water). Currently, I am involved in investigating the water use and physiology of Eucalyptus species in the Pilbara (ARC-Linkage project 'Dynamics of woody vegetation and water in the central Pilbara to understand and manage for environmental change'). We work with Rio Tinto and BHP Billiton as well as the Department of Water and Water Corporation in order to establish the vulnerability of the Pilbara ecosystems to water extraction for mining and human use. This project involves the use of sap flow, gas exchange and stable isotope techniques. Additionally, we are comparing these results with Eucalyptus species growing in cooler and wetter ecosystems in the south-east of Australia. Another project is looking at the influence of water and elevated CO2 on the growth and survival of Eucalyptus saligna in the Hawkesbury Forest Experiment at the University of Western Sydney. We have set up a mass spectrometry laboratory at the Plant Breeding Institute (PBI) in Cobbitty, NSW. The facility includes an Isotope Ratio Mass Spectrometer (IRMS; Delta V, Thermo Finnigan) and will contain a Gas Chromatography/Mass Spectrometer (GC/MS; Agilent), a Proton Transfer Reaction Mass Spectrometer (PTR-MS; Ionicon) and gas chromatographs (Varian and SRI) from early 2010. This facility is open for use for everyone. The IRMS is able to measure _13C and _18O in CO2 as well as _13C, _15N, _18O and _2H in plant and animal material (liquid and solid).

Themes

Plant and crop physiology; Climate Change

Selected grants

2013

  • Optimization of catchment management: stable isotope studies of water storage and yield.; Adams M, Vervoort R, Buckley T, Simonin K, Keitel C, Hepplewhite C; Australian Research Council (ARC)/Linkage Projects (LP).

Selected publications

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Journals

  • Bruggemann, N., Gessler, A., Kayler, Z., Keel, S., Badeck, F., Barthel, M., Boeckx, P., Buchmann, N., Brugnoli, E., Esperschutz, J., Keitel, C., et al (2011). Carbon allocation and carbon isotope fluxes in the plant-soil-atmosphere continuum: A review. Biogeosciences Discussions, 8(2), 3619-3695. [More Information]
  • Pfautsch, S., Keitel, C., Turnbull, T., Braimbridge, M., Wright, T., Simpson, R., O'Brien, J., Adams, M. (2011). Diurnal patterns of water use in Eucalyptus victrix indicate pronounced desiccation–rehydration cycles despite unlimited water supply. Tree Physiology, 31(10), 1041-1051. [More Information]
  • Werner, C., Badeck, F., Brugnoli, E., Cohn, B., Cuntz, M., Dawson, T., Gessler, A., Ghashghaie, J., Grams, T., Kayler, Z., Keitel, C., et al (2011). Linking carbon and water cycles using stable isotopes across scales: Progress and challenges. Biogeosciences Discussions, 8(2), 2659-2719. [More Information]
  • Haverd, V., Cuntz, M., Grif�?th, D., Keitel, C., Tadros, C., Twining, J. (2011). Measured deuterium in water vapour concentration does not improve the constraint on the partitioning of evapotranspiration in a tall forest canopy, as estimated using a soil vegetation atmosphere transfer model. Agricultural and Forest Meteorology, 151(6), 645-654. [More Information]
  • Merchant, A., Peuke, A., Keitel, C., Macfarlane, C., Warren, C., Adams, M. (2010). Phloem sap and leaf delta13C, carbohydrates, and amino acid concentrations in Eucalyptus globulus change systematically according to flooding and water deficit treatment. Journal of Experimental Botany, 61(6), 1785-1793.
  • Merchant, A., Tausz, M., Keitel, C., Adams, M. (2010). Relations of sugar composition and delta13C in phloem sap to growth and physiological performance of Eucalyptus globulus (Labill). Plant, Cell and Environment, 33(8), 1361-1368.
  • Stuart-Williams, H., Wong, S., Farquhar, G., Keitel, C., Clayton, S. (2008). An innovative molybdenum column liner for oxygen and hydrogen stable isotope analysis by pyrolysis. Rapid Communications in Mass Spectrometry, 22, 1117-1126. [More Information]
  • Gessler, A., Keitel, C., Kodama, N., Weston, C., Winters, A., Keith, H., Grice, K., Leuning, R., Farquhar, G. (2007). d13C of organic matter transported from the leaves to the roots in Eucalyptus delegatensis: short-term variations and relation to respired CO2. Functional Plant Biology: an international journal of plant function, 34, 692-706.
  • Gessler, A., Peuke, A., Keitel, C., Farquhar, G. (2007). Oxygen isotope enrichment of organic matter in Ricinus communis during the diel course and as affected by assimilate transport. New Phytologist, 174, 600-613.
  • Gessler, A., Keitel, C., Kreuzwieser, J., Matyssek, R., Seiler, W., Rennenberg, H. (2007). Potential risks for European beech (Fagus sylvatica L.) in a changing climate. Trees: structure and function, 21, 1-11. [More Information]
  • Keitel, C., Matzarakis, A., Rennenberg, H., Gessler, A. (2006). Carbon isotopic composition and oxygen isotopic enrichment in phloem and total leaf organic matter of European beech (Fagus sylvatica L.) along a climate gradient. Plant, Cell and Environment, 29, 1492-1507.
  • Brandes, E., Kodama, N., Whittaker, K., Weston, C., Rennenberg, H., Keitel, C., Adams, M., Gessler, A. (2006). Short-term variation in the isotopic composition of organic matter allocated from the leaves to the stem of Pinus sylvestris: effects of photosynthetic and postphotosynthetic carbon isotope fractionation. Global Change Biology, 12(10), 1922-1939.
  • Gessler, A., Rennenberg, H., Keitel, C. (2004). Stable Isotope Composition of Organic Compounds Transported in the Phloem of European Beech - Evaluation of Different Methods of Phloem Sap Collection and Assessment of Gradients in Carbon Isotope Composition during Leaf-to-Stem Transport. Plant Biology, 6, 721-729.
  • Gessler, A., Keitel, C., Nahm, M., Rennenberg, H. (2004). Water Shortage affects the water and nitrogen balance in Central European beech forests. Plant Biology, 6, 289-298.
  • Keitel, C., Adams, M., Holst, T., Matzarakis, A., Mayer, H., Rennenberg, H., Gessler, A. (2003). Carbon and oxygen isotope composition of organic compounds in the phloem sap provides a short-term measure for stomatal conductance of European beech (Fagus sylvatica L.). Plant, Cell and Environment, 26(7), 1157-1168.

Conferences

  • Kayler, Z., Keitel, C., Jansen, K., Gessler, A. (2011). Can we use isotopes to capture the speed of link between photosynthesis and soil respiration? European Geosciences Union General Assembly 2011, Austria: Copernicus GmbH.
  • Kayler, Z., Keitel, C., Jansen, K., Gessler, A. (2011). Deciphering The Speed of Link: Experimental Evidence of a Rapid Increase in Soil Respiration Following the Onset of Photosynthesis. American Geophysical Union Fall Meeting, USA: AGU.

2011

  • Kayler, Z., Keitel, C., Jansen, K., Gessler, A. (2011). Can we use isotopes to capture the speed of link between photosynthesis and soil respiration? European Geosciences Union General Assembly 2011, Austria: Copernicus GmbH.
  • Bruggemann, N., Gessler, A., Kayler, Z., Keel, S., Badeck, F., Barthel, M., Boeckx, P., Buchmann, N., Brugnoli, E., Esperschutz, J., Keitel, C., et al (2011). Carbon allocation and carbon isotope fluxes in the plant-soil-atmosphere continuum: A review. Biogeosciences Discussions, 8(2), 3619-3695. [More Information]
  • Kayler, Z., Keitel, C., Jansen, K., Gessler, A. (2011). Deciphering The Speed of Link: Experimental Evidence of a Rapid Increase in Soil Respiration Following the Onset of Photosynthesis. American Geophysical Union Fall Meeting, USA: AGU.
  • Pfautsch, S., Keitel, C., Turnbull, T., Braimbridge, M., Wright, T., Simpson, R., O'Brien, J., Adams, M. (2011). Diurnal patterns of water use in Eucalyptus victrix indicate pronounced desiccation–rehydration cycles despite unlimited water supply. Tree Physiology, 31(10), 1041-1051. [More Information]
  • Werner, C., Badeck, F., Brugnoli, E., Cohn, B., Cuntz, M., Dawson, T., Gessler, A., Ghashghaie, J., Grams, T., Kayler, Z., Keitel, C., et al (2011). Linking carbon and water cycles using stable isotopes across scales: Progress and challenges. Biogeosciences Discussions, 8(2), 2659-2719. [More Information]
  • Haverd, V., Cuntz, M., Grif�?th, D., Keitel, C., Tadros, C., Twining, J. (2011). Measured deuterium in water vapour concentration does not improve the constraint on the partitioning of evapotranspiration in a tall forest canopy, as estimated using a soil vegetation atmosphere transfer model. Agricultural and Forest Meteorology, 151(6), 645-654. [More Information]

2010

  • Merchant, A., Peuke, A., Keitel, C., Macfarlane, C., Warren, C., Adams, M. (2010). Phloem sap and leaf delta13C, carbohydrates, and amino acid concentrations in Eucalyptus globulus change systematically according to flooding and water deficit treatment. Journal of Experimental Botany, 61(6), 1785-1793.
  • Merchant, A., Tausz, M., Keitel, C., Adams, M. (2010). Relations of sugar composition and delta13C in phloem sap to growth and physiological performance of Eucalyptus globulus (Labill). Plant, Cell and Environment, 33(8), 1361-1368.

2008

  • Stuart-Williams, H., Wong, S., Farquhar, G., Keitel, C., Clayton, S. (2008). An innovative molybdenum column liner for oxygen and hydrogen stable isotope analysis by pyrolysis. Rapid Communications in Mass Spectrometry, 22, 1117-1126. [More Information]

2007

  • Gessler, A., Keitel, C., Kodama, N., Weston, C., Winters, A., Keith, H., Grice, K., Leuning, R., Farquhar, G. (2007). d13C of organic matter transported from the leaves to the roots in Eucalyptus delegatensis: short-term variations and relation to respired CO2. Functional Plant Biology: an international journal of plant function, 34, 692-706.
  • Gessler, A., Peuke, A., Keitel, C., Farquhar, G. (2007). Oxygen isotope enrichment of organic matter in Ricinus communis during the diel course and as affected by assimilate transport. New Phytologist, 174, 600-613.
  • Gessler, A., Keitel, C., Kreuzwieser, J., Matyssek, R., Seiler, W., Rennenberg, H. (2007). Potential risks for European beech (Fagus sylvatica L.) in a changing climate. Trees: structure and function, 21, 1-11. [More Information]

2006

  • Keitel, C., Matzarakis, A., Rennenberg, H., Gessler, A. (2006). Carbon isotopic composition and oxygen isotopic enrichment in phloem and total leaf organic matter of European beech (Fagus sylvatica L.) along a climate gradient. Plant, Cell and Environment, 29, 1492-1507.
  • Brandes, E., Kodama, N., Whittaker, K., Weston, C., Rennenberg, H., Keitel, C., Adams, M., Gessler, A. (2006). Short-term variation in the isotopic composition of organic matter allocated from the leaves to the stem of Pinus sylvestris: effects of photosynthetic and postphotosynthetic carbon isotope fractionation. Global Change Biology, 12(10), 1922-1939.

2004

  • Gessler, A., Rennenberg, H., Keitel, C. (2004). Stable Isotope Composition of Organic Compounds Transported in the Phloem of European Beech - Evaluation of Different Methods of Phloem Sap Collection and Assessment of Gradients in Carbon Isotope Composition during Leaf-to-Stem Transport. Plant Biology, 6, 721-729.
  • Gessler, A., Keitel, C., Nahm, M., Rennenberg, H. (2004). Water Shortage affects the water and nitrogen balance in Central European beech forests. Plant Biology, 6, 289-298.

2003

  • Keitel, C., Adams, M., Holst, T., Matzarakis, A., Mayer, H., Rennenberg, H., Gessler, A. (2003). Carbon and oxygen isotope composition of organic compounds in the phloem sap provides a short-term measure for stomatal conductance of European beech (Fagus sylvatica L.). Plant, Cell and Environment, 26(7), 1157-1168.

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