Towards a physiological basis for intensive culture of American sycamore, Platanus occidentalis L
The light environment of forest canopies is complex leading to differentiation in morphological development and alteration of physiological processes that are important for the proper combination of genotype and site factors to maximize final yield. To select leaves and plants of a uniform age plastochron and leaf plastochron indices were developed for American sycamore Platanus occidentalis L. The application of these indices was useful in selecting a population of plants of uniform age and, morphological development, and useful in selecting leaves of uniform age within the zone of leaf development. Labeling studies in which leaves of specific ages were fed /sup 14/CO/sub 2/ indicated that leaves of this species undergo transitions in degree and direction of export. Acropetal export of photosynthates conforms to a phyllotactic sequence, suggesting a relationship between arrangement of vascular bundles and phyllotaxy. Examination of the /sup 14/CO/sub 2/ labeling patterns in source leaves (LPI 2.0) showed rapid incorporation of label into amino acid, sugar, and organic acid chemical pools that can be used to in situ synthesis of proteins, lipids, and other structural components. However as the irradiance regime under which the plants were grown decreased, leaves partitioned more fixed /sup 14/CO/sub 2/ into starch than into the water soluble fraction from which metabolic and structural components as well as a transport species could be synthesized.
- Research Organization:
- Kentucky Univ., Lexington (USA)
- OSTI ID:
- 5179410
- Resource Relation:
- Other Information: Thesis (Ph. D.)
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
PHOTOSYNTHESIS
BIOCHEMICAL REACTION KINETICS
SYCAMORES
PRODUCTIVITY
AMINO ACIDS
CANOPIES
CARBON 14 COMPOUNDS
CARBON DIOXIDE
FORESTS
LEAVES
ORGANIC ACIDS
SACCHAROSE
TRACER TECHNIQUES
VISIBLE RADIATION
CARBOHYDRATES
CARBON COMPOUNDS
CARBON OXIDES
CARBOXYLIC ACIDS
CHALCOGENIDES
CHEMICAL REACTIONS
DISACCHARIDES
ELECTROMAGNETIC RADIATION
ISOTOPE APPLICATIONS
KINETICS
LABELLED COMPOUNDS
OLIGOSACCHARIDES
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHOTOCHEMICAL REACTIONS
PLANTS
RADIATIONS
REACTION KINETICS
SACCHARIDES
SYNTHESIS
TREES
550501* - Metabolism- Tracer Techniques