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DTSTART:20161030T030000
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DTSTAMP:20260405T113502Z
DESCRIPTION:In contrast to the stable C\, N and O isotope composition of pl
 ant materials\, the hydrogen isotope composition of plant organic compound
 s has not yet been established as a tool in ecological or biogeochemical r
 esearch. With the development of new analytical instruments that allow the
  hydrogen isotope analysis of selected plant compounds there is\, however\
 , growing interest to explore the power of hydrogen isotopes as tools for 
 ecological and biogeochemical research. In my talk I will summarize recent
  work from my lab where we show that the hydrogen isotope composition of l
 ipids and carbohydrates reflect the carbon and energy metabolism in plants
 : Our experiments revealed that autotrophic and carbon-autonomous plant ti
 ssue is 2H depleted while heterotrophic or non-carbon-autonomous tissue is
  2H enriched. We were able to identify various biochemical processes durin
 g the biosynthesis of plant tissue that contribute to these patterns and c
 an show that these patterns apply for various levels of organization: acro
 ss plant species (e.g. heterotrophic parasitic plants and their autotrophi
 c hosts)\, across different organs within an individual plant (e.g. autotr
 ophic leaves vs. heterotrophic roots)\, and even within a plant organ (e.g
 . following the transition of a leaf from a carbohydrate sink to a carbohy
 drate source during ontogeny). As such\, the hydrogen isotope composition 
 of plant tissue seems to be a robust proxy for the carbohydrate metabolism
  in plants and could serve thus as an important new tool in plant ecology\
 , plant breeding\, biogeochemistry\, and paleo applications. In fact\, we 
 investigated a historic collection of grass samples from the famous 150 ye
 ar old Park Grass Experiment in Rothamsted and were able to show\, that th
 e hydrogen isotope composition of grasses has become 2H depleted by about 
 40 per mil over the past decades. This suggests that global environmental 
 change leads to significant and previously unresolved shifts in the carboh
 ydrate dynamics of plants and that the hydrogen isotope composition of car
 bohydrates and lipids is a fascinating new tool to identify these changes.
 \n*** Invited by Gerhard Gebauer\, BayCEER Isotope Biogeochemistry
DTSTART;TZID=Europe/Berlin:20170112T120000
DTEND;TZID=Europe/Berlin:20170112T133000
LOCATION:H6\, GEO
SUMMARY:Prof. Dr. Ansgar Kahmen\, Sustainable Land Use\, University of Base
 l\, Switzerland (Homepage): Hydrogen isotopes in plant organic compounds  
 indicate strong shifts in the  carbohydrate metabolism of plants over  the
  past century
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