Oxygen and Hydrogen Isotope Ratios of Water from Photosynthetic Tissues of CAM and C3 Plants 1
AUTOR(ES)
Sternberg, Leonel Da S. L.
RESUMO
Water samples from photosynthetic tissues of C3 and Crassulacean acid metabolism (CAM) plants that grew together in the field were extracted and the stable oxygen and hydrogen isotope ratios determined. During the day, 18O/16O and deuterium/hydrogen (D/H) ratios of water from CAM plants were lower than those observed in water from C3 plants. The patterns of diurnal variation (or lack thereof) in isotope ratios of plant water are consistent with the gross anatomical and physiological characteristics of the plants studied here. Our observations support the previously advanced hypothesis that high D/H ratios in cellulose nitrate prepared from CAM plants relative to those for C3 plants are not caused by greater deuterium enrichment in the water in CAM plants, but rather by isotopic fractionations associated with different biochemical reactions in the two types of plants.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=1056135Documentos Relacionados
- Carbon Isotope Ratios Demonstrate Carbon Flux from C4 Host to C3 Parasite 1
- Photosynthetic Phosphoenolpyruvate Carboxylases: Characteristics of Alloenzymes from Leaves of C3 and C1 Plants 1
- Influence of drinking water and diet on the stable-hydrogen isotope ratios of animal tissues
- Comparative Studies of Phosphoenolpyruvate Carboxylase from C3 and C4 Plants 1
- Microbe forensics: Oxygen and hydrogen stable isotope ratios in Bacillus subtilis cells and spores
