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(14)C fixation, metabolic labeling patterns, and translocation profiles during leaf development in Populus deltoides
1U.S. Department of Agriculture, Forest Service, Forestry Sciences Laboratory, North Central Forest Experiment Station, 54501, Rhinelander, WI, USA.
Planta
|December 5, 2013
Summary
This study tracked carbon-14 (14C) in cottonwood leaves, revealing that young leaves prioritize structural components while mature leaves rapidly convert and translocate sugars. Leaf maturity dictates carbon allocation and transport efficiency.
Area of Science:
- Plant Physiology
- Photosynthesis Research
- Plant Biochemistry
Background:
- Understanding carbon allocation in plants is crucial for predicting growth and response to environmental changes.
- Cottonwood (Populus deltoides) leaves undergo significant developmental and physiological changes from expansion to senescence.
Purpose of the Study:
- To investigate the incorporation and distribution of photosynthetically fixed carbon-14 (14C) in cottonwood leaves of varying ages.
- To examine carbon flow among chemical fractions and translocation from leaves at different developmental stages.
Main Methods:
- Cottonwood leaves at different Leaf Plastochron Index (LPI) stages were exposed to (14)CO2.
- Distribution of (14)C among chemical constituents (sugars, proteins, lipids, etc.) in laminae and petioles was analyzed.
- Carbon translocation and turnover rates were measured over 24 hours using pulse-chase experiments.
Main Results:
- In developing leaves, (14)C was primarily incorporated into structural and metabolic components.
- Mature leaves (LPI 6-8) showed rapid conversion of (14)C into sugars (50-60% in lamina, 90% in petiole).
- Over 24 hours, (14)C decreased in sugars and increased in residue fractions, indicating translocation and metabolism; turnover rates varied by fraction and leaf age.
Conclusions:
- Leaf anatomical maturity in cottonwood is closely linked to physiological maturity and the production of translocatable sugars.
- The developmental stage of the leaf significantly influences carbon fixation, allocation, and export dynamics.
