Effect of cations on the permeability of pear leaf cuticle to protons

Journal Article · Sat Apr 01 00:00:00 EST 1989 · Plant Physiology, Supplement; (USA)

OSTI ID:6936486

Smalley, S; Berg, V ^[1]

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1. Univ. of Northern Iowa, Cedar Falls (USA)

Direct damage to leaves by acid precipitation must involve penetration of the cuticle by the acid. We investigated how the permeability of isolated pear leaf cuticles was affected by the presence of different cations on the morphological inner side. Isolated cuticles were mounted in apparatus with the morphological outer side of the cuticle exposed to pH 3 acid and the inner side exposed to approximately pH 7 solution. Changes in the pH of the inside solution were monitored to determine cuticle permeability to protons. Permeabilities from trials with and without solutions of CaCl{sub 2}, CdCl{sub 2}, MgCl{sub 2}, NaCl and KCl were compared. The presence of calcium, cadmium or magnesium ions greatly reduced the permeability of the cuticles to protons. Potassium and sodium ions had no significant effect on permeability. These effects will be used to propose a modified model of proton movement through leaf cuticle.

• OSTI ID: 6936486
• Journal Information: Plant Physiology, Supplement; (USA), Vol. 89:4; ISSN 0079-2241
• Country of Publication: United States
• Language: English

Related Subjects

63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
CADMIUM CHLORIDES
BIOLOGICAL EFFECTS
CALCIUM CHLORIDES
LEAVES
PERMEABILITY
MAGNESIUM CHLORIDES
ACID RAIN
CATIONS
MORPHOLOGICAL CHANGES
PH VALUE
ALKALINE EARTH METAL COMPOUNDS
ATMOSPHERIC PRECIPITATIONS
CADMIUM COMPOUNDS
CADMIUM HALIDES
CALCIUM COMPOUNDS
CALCIUM HALIDES
CHARGED PARTICLES
CHLORIDES
CHLORINE COMPOUNDS
HALIDES
HALOGEN COMPOUNDS
IONS
MAGNESIUM COMPOUNDS
RAIN
560300* - Chemicals Metabolism & Toxicology