Journal Article

Influence of Simulated Acid Snow Stress on Leaf Tissue of Wintering Herbaceous Plants

Hidetoshi Inada, Manabu Nagao, Seizo Fujikawa and Keita Arakawa

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 47, issue 4, pages 504-512
Published in print April 2006 | ISSN: 0032-0781
Published online April 2006 | e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/pcp/pcj019
Influence of Simulated Acid Snow Stress on Leaf Tissue of Wintering Herbaceous Plants

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  • Biochemistry
  • Molecular and Cell Biology
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Acid snow might be an environmental stress factor for wintering plants since acid precipitates are locally concentrated in snow and the period in which ice crystals are in contact with shoots might be longer than that of acid precipitates in rain. In this study, ‘equilibrium’ and ‘prolonged’ freezing tests with sulfuric acid, which simulate situations of temperature depression and chronic freezing at a subzero temperature with acid precipitate as acid snow stress, respectively, were carried out using leaf segments of cold-acclimated winter wheat. When leaf segments were frozen in the presence of sulfuric acid solution (pH 4.0, 3.0 or 2.0) by equilibrium freezing with ice seeding, the survival rate of leaf samples treated with sulfuric acid solution of pH 2.0 decreased markedly. Leaf samples after supercooling to –4 and –8°C in the presence of sulfuric acid solution (pH 2.0) without ice seeding were less damaged. When leaf samples were subjected to prolonged freezing at –4 and –8°C for 7 d with sulfuric acid (pH 2.0), the survival rates of leaf samples exposed to sulfuric acid decreased more than those of leaf samples treated with water. On the other hand, leaf samples were less damaged by prolonged supercooling at –4 and –8°C for 7 d with sulfuric acid (pH 2.0). The results suggest that an acid condition (pH 2.0) in the process of extracellular freezing and/or thawing promotes freezing injury of wheat leaves.

Keywords: Cold-acclimated leaves; Freezing injury; Simulated acid snow; Triticum aestivum; EQF, equilibrium freezing; EQFA, equilibrium freezing under acid conditions; PRF, prolonged freezing; PRFA, prolonged freezing under acid conditions; SAR, simulated acid rain

Journal Article.  5875 words.  Illustrated.

Subjects: Biochemistry ; Molecular and Cell Biology ; Plant Sciences and Forestry

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