Post-photosynthetic modification of oxygen isotope ratios of carbohydrates in the potato: Implications for paleoclimatic reconstruction based upon isotopic analysis of wood cellulose

Details Post-photosynthetic modification of oxygen isotope ratios of carbohydrates in the potato: Implications for paleoclimatic reconstruction based upon isotopic analysis of wood cellulose Post-photosynthetic modification of oxygen isotope ratios of carbohydrates in the potato: Implications for paleoclimatic reconstruction based upon isotopic analysis of wood cellulose

Oct 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989gecoa..53.2573d&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 53, Issue 10, pp.2573-2580

Computer Science

3

Scientific paper

Models for reconstructing climate from the 18 O values of wood cellulose are based on the assumptions that only the 18 O values of leaf water and biochemical processes occurring in the leaves of trees influence the oxygen isotopic composition of wood cellulose. Experiments with potatoes sprouted under controlled conditions indicate that the 18 O values of shoot cellulose are determined not only by biochemical reactions during photosynthesis, but also by post-photosynthetic processes occurring in the roots and shoots. These experiments also indicate that the 18 O values of water in the roots and shoots, not only those of leaf water, affect the isotopic composition of shoot cellulose. If, as we argue, potatoes do not differ from trees with respect to the processes that determine the 18 O / 16 O ratios of shoot cellulose, the aforementioned assumptions made in deriving models for paleoclimatic reconstruction based upon 18 O values of wood cellulose cannot be valid. Our results also suggest that wood cellulose ° 18 O values may not be sensitive to variations in atmospheric humidity, a conclusion at odds with that drawn by paleoclimatologists.

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