Partitioning and transport of the translocates mannitol and sucrose in the light and dark in celery (Apium Graveolens L. )

Conference · Wed Apr 01 04:00:00 EST 1987 · Plant Physiol., Suppl.; (United States)

OSTI ID:5625293

Davis, J M; Loescher, W H

Sucrose and mannitol are major photosynthetic products and translocates in celery. Assimilate partitioning and transport were studied by pulse-labeling leaves with /sup 14/CO/sub 2/ followed by different length chases in ambient air. After a 2 h chase in the light there was more /sup 14/C in sucrose than mannitol in source leaves and their petioles. In contrast after a 2 h dark chase leaves contained more /sup 14/C in mannitol than sucrose but petioles had more /sup 14/C in sucrose than mannitol. After a 15 h chase (6 h light; 9 h dark) labeled sucrose was higher in source petiole vascular bundles than in adjacent parenchyma tissue but label in glucose and fructose was higher in the parenchyma tissue. After the 15 h chase most of the /sup 14/C remaining in developing sink leaves and their petioles was in mannitol. Although in the light mannitol:sucrose ratios are the same in leaf and petiole tissues, in the dark sucrose is initially the major translocate with mannitol becoming more important as leaf sucrose pools are depleted. When synthesized, sucrose is rapidly transported and then metabolized to hexose sugars whereas mannitol is used both for transport and storage.

• Research Organization: Washington State Univ., Pullman
• OSTI ID: 5625293
• Report Number(s): CONF-8707108-
• Conference Information: Journal Name: Plant Physiol., Suppl.; (United States) Journal Volume: 83:4
• Country of Publication: United States
• Language: English

Related Subjects

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59 BASIC BIOLOGICAL SCIENCES
ALDEHYDES
CARBOHYDRATES
CARBON 14 COMPOUNDS
CHEMICAL REACTIONS
DISACCHARIDES
DISTRIBUTION
ELECTROMAGNETIC RADIATION
FOOD
FRUCTOSE
GLUCOSE
HEXOSES
ISOTOPE APPLICATIONS
KETONES
LABELLED COMPOUNDS
LEAVES
MONOSACCHARIDES
OLIGOSACCHARIDES
ORGANIC COMPOUNDS
PHOTOCHEMICAL REACTIONS
PHOTOSYNTHESIS
PLANTS
RADIATIONS
SACCHARIDES
SACCHAROSE
SYNTHESIS
TISSUE DISTRIBUTION
TRACER TECHNIQUES
TRANSLOCATION
VEGETABLES
VISIBLE RADIATION