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Metabolic Profiling of the Sink-to-Source Transition in Developing Leaves of Quaking Aspen1
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Plant Physiology
- Article date:
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October 1, 2004
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Copyright informationCopyright American Society of Plant Physiologists Oct 2004. Provided by ProQuest LLC. (Hide copyright information)
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Profiles of small polar metabolites from aspen (Populus tremuloides Michx.) leaves spanning the sink-to-source transition zone were compared. Approximately 25% of 250 to 300 routinely resolved peaks were identified, with carbohydrates, organic acids, and amino acids being most abundant. Two-thirds of identified metabolites exhibited greater than 4-fold changes in abundance during leaf ontogeny. In the context of photosynthetic and respiratory measurements, profile data yielded information consistent with expected developmental trends in carbon-heterotrophic and carbon-autotrophic metabolism. Suc concentration increased throughout leaf expansion, while hexose sugar concentrations peaked at ...
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