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Plant Physiology 63:924-930 (1979)
© 1979 American Society of Plant Biologists

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Articles

Emission of Ethylene and Ethane by Leaf Tissue Exposed to Injurious Concentrations of Sulfur Dioxide or Bisulfite Ion 1

Ray A. Bressan2, Lloyd Lecureux, Lloyd G. Wilson and Philip Filner

a MSU-DOE Plant Research Laboratory, Michigan State University, East Lansing, Michigan 48824

Leaf tissues injured with SO2 gas or bisulfite ion in solution emit ethylene and ethane. The amounts of these gases produced by the tissues depend on the degree of exposure to SO2 or bisulfite. The amount of ethylene produced in response to SO2 fumigation correlates positively with SO2 exposure (0 to 5.5 microliters per liter for 16 hours), SO2 absorbed, and the amount of visible injury sustained by the leaf tissues. Ethane production is correlated positively with the injury resulting from treatment with bisulfite ion. The rate of emission of ethane from leaf discs of cucurbit cultivars as a result of exposure to bisulfite solutions is in agreement with the order and the degree of their resistance to injury by SO2. Thus, exposure to bisulfite and the subsequent release of ethane can be used to determine the relative resistance of different species and cultivars to SO2 gas.

A rapid, simple, objective assay for SO2 resistance based on ethane emission is described. This assay should preferentially detect SO2 resistance which does not depend on stomatal behavior. The screening of several other cucurbits with this assay showed a 24-fold difference between the most and the least sensitive plants tested.

2 Present address: Department of Horticulture, Purdue University, Lafayette, Indiana 47907.

1 This work was supported by the Department of Energy Contract EY-76-C-02-1338.






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Copyright © 1979 by the American Society of Plant Biologists