Transfer cell wall ingrowths and transport capacity in pea leaf discs. [Pisum sativum cv]

Conference · Tue Apr 01 04:00:00 EST 1986 · Plant Physiol., Suppl.; (United States)

OSTI ID:5004684

Wimmers, L E; Turgeon, R

Transfer cell wall ingrowths are thought to increase transport capacity by increasing plasmelemma surface area. Little direct evidence for this hypothesis exists since experimental systems in which the surface area of wall ingrowths can be modulated have not been available. They grew Pisum sativum cv. Little Marvel plants under three light regimes (150, 500, 1000 umol photons m/sup -2/ sec/sup -1/) using 1000 watt Sylvania Metal Halide lamps. Wall ingrowths in minor vein phloem parenchyma cells were analyzed morphometrically from electron micrographs and a positive correlation was found between light intensity and extent of wall ingrowths. Vein loading was assayed by floating abraded leaf discs on /sup 14/C-sucrose (1 mM). There was a positive correlation between uptake and transfer cell wall surface area, although the latter increased more than the former. No significant differences were found in vein length, numbers of phloem elements, or phloem cross sectional areas. Changes in light intensity after a leaf reached maturity did not change uptake potential over a period of at least three days.

• Research Organization: Cornell Univ., Ithaca, NY
• OSTI ID: 5004684
• Conference Information: Journal Name: Plant Physiol., Suppl.; (United States) Journal Volume: 80:4
• Country of Publication: United States
• Language: English

Related Subjects

551001* -- Physiological Systems-- Tracer Techniques
59 BASIC BIOLOGICAL SCIENCES
BACTERIA
CARBOHYDRATES
CARBON 14 COMPOUNDS
CELL CONSTITUENTS
CELL WALL
DISACCHARIDES
LABELLED COMPOUNDS
LEAVES
LEGUMINOSAE
MICROORGANISMS
OLIGOSACCHARIDES
ORGANIC COMPOUNDS
PISUM
PLANTS
RADIONUCLIDE KINETICS
RHIZOBIUM
SACCHARIDES
SACCHAROSE
UPTAKE