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Transfer cell wall ingrowths and vein loading characteristics in pea leaf discs. [Pisum sativum]

Conference · · Plant Physiol., Suppl.; (United States)
OSTI ID:6073213
;
Transfer cell wall ingrowths are thought to increase transport capacity by increasing plasmalemma surface area. Leaf minor vein phloem transfer cells presumably enhance phloem loading. In Pisum sativum cv. Little marvel grown under different light regimes (150 to 1000 ..mu..mol photons m/sup -2/ sec/sup -1/) there is a positive correlation between light intensity and wall ingrowth area in phloem transfer cells. The extent of ingrowth and correlation to light intensity is greatest in minor veins, decreasing as vein size increases. Vein loading was assayed by floating abraded leaf discs on /sup 14/C-sucrose (10 mM). There is a positive correlation between uptake and transfer cell wall area, although the latter increased more than the former. The difference in uptake is stable throughout the photoperiod, and is also stable in mature leaves for at least four days after plants are transfered to a different light intensity. Sucrose uptake is biphasic. The saturable component of uptake is sensitive to light intensity, the Km for sucrose is negatively correlated to light intensity, while V/sub max/remains unchanged.
Research Organization:
Cornell Univ., Ithaca, NY
OSTI ID:
6073213
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

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Related Subjects

550201* -- Biochemistry-- Tracer Techniques
551001 -- Physiological Systems-- Tracer Techniques
59 BASIC BIOLOGICAL SCIENCES
BACTERIA
BIOCHEMICAL REACTION KINETICS
BIOLOGICAL EFFECTS
CARBOHYDRATES
CARBON 14 COMPOUNDS
CELL CONSTITUENTS
CELL MEMBRANES
CELL WALL
DISACCHARIDES
ELECTROMAGNETIC RADIATION
ISOTOPE APPLICATIONS
KINETICS
LABELLED COMPOUNDS
LEAVES
LEGUMINOSAE
MEMBRANES
MICROORGANISMS
MORPHOLOGY
OLIGOSACCHARIDES
ORGANIC COMPOUNDS
PISUM
PLANTS
RADIATIONS
REACTION KINETICS
RHIZOBIUM
SACCHARIDES
SACCHAROSE
TRACER TECHNIQUES
TRANSLOCATION
UPTAKE
VISIBLE RADIATION