Pronounced differences in diurnal variation of carbon isotope composition of leaf respired CO2 among functional groups

Priault P, Wegener F, Werner C (2009)
NEW PHYTOLOGIST 181(2): 400-412.

Zeitschriftenaufsatz | Veröffentlicht | Englisch
 
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Abstract / Bemerkung
The first broad species survey of diurnal variation in carbon (C) isotope signatures of leaf dark-respired CO2 (delta C-13(res)) is presented here and functional differences and diurnal dynamics are linked to fractionation in different respiratory pathways, based on C-13-labelling experiments. delta C-13(res) was analysed with a rapid in-tube incubation technique in 16 species. A large diurnal increase in delta C-13(res) (4-8 parts per thousand) occurred in evergreen, slow-growing and aromatic species and correlated significantly with cumulative photosynthesis, whereas no variation occurred in herbaceous, fast-growing plants or temperate trees. The diurnal increase in delta C-13(res) declined almost proportionally to reductions in cumulative light and was reduced in growing compared with mature leaves. Pyruvate positional labelling provided direct evidence that functional groups differ in C allocation between respiratory pathways owing to different metabolic demands for growth, maintenance and secondary metabolism. Diurnal increase in C flux through pyruvate dehydrogenase (for investment in, for example, isoprene or aromatic compounds) combined with consistently low Krebs cycle activity resulted in pronounced increase in delta C-13(res) in evergreen and aromatic species. By contrast, fast growing herbs with high respiratory demand exhibited no diurnal changes since C was fully respired. Hence, diurnal delta C-13(res) pattern may provide information for C allocation in plants. New Phytologist (2009) 181: 400-412doi: 10.1111/j.1469-8137.2008.02665.x.
Stichworte
allocation; isotope; functional groups; fractionation; pyruvate positional labelling; respired CO2; respiration; diurnal variation; delta C-13
Erscheinungsjahr
2009
Zeitschriftentitel
NEW PHYTOLOGIST
Band
181
Ausgabe
2
Seite(n)
400-412
ISSN
0028-646X
eISSN
1469-8137
Page URI
https://pub.uni-bielefeld.de/record/1635445

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Priault P, Wegener F, Werner C. Pronounced differences in diurnal variation of carbon isotope composition of leaf respired CO2 among functional groups. NEW PHYTOLOGIST. 2009;181(2):400-412.
Priault, P., Wegener, F., & Werner, C. (2009). Pronounced differences in diurnal variation of carbon isotope composition of leaf respired CO2 among functional groups. NEW PHYTOLOGIST, 181(2), 400-412. doi:10.1111/j.1469-8137.2008.02665.x
Priault, P., Wegener, F., and Werner, C. (2009). Pronounced differences in diurnal variation of carbon isotope composition of leaf respired CO2 among functional groups. NEW PHYTOLOGIST 181, 400-412.
Priault, P., Wegener, F., & Werner, C., 2009. Pronounced differences in diurnal variation of carbon isotope composition of leaf respired CO2 among functional groups. NEW PHYTOLOGIST, 181(2), p 400-412.
P. Priault, F. Wegener, and C. Werner, “Pronounced differences in diurnal variation of carbon isotope composition of leaf respired CO2 among functional groups”, NEW PHYTOLOGIST, vol. 181, 2009, pp. 400-412.
Priault, P., Wegener, F., Werner, C.: Pronounced differences in diurnal variation of carbon isotope composition of leaf respired CO2 among functional groups. NEW PHYTOLOGIST. 181, 400-412 (2009).
Priault, Pierrick, Wegener, Frederik, and Werner, Christiane. “Pronounced differences in diurnal variation of carbon isotope composition of leaf respired CO2 among functional groups”. NEW PHYTOLOGIST 181.2 (2009): 400-412.

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