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Superoxide dismutase: A possible protective agent against sunscald in tomatoes (lycopersicon esculentum mill.) by Haim D. Rabinowitch; David Sklan is a Agricultural and Biological Sciences article available to read on EtoBox.

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Superoxide dismutase (SOD, EC 1.15.1.1) was concentrated from mature-green tomato fruits by gel chromatography. The enzyme was inhibited by cyanide but not by chloroform-ethanol, and appears to contain zinc and lesser amounts of copper. SOD-activity levels were high in immature green fruits, declined to a minimum in the mature-green and breaker stages known to be most susceptible to sunscald damage, increased again until the fruits were pink, and finally decreased through the red-ripe and overripe stages to the level of the mature-green fruit. When tolerance to sunscald damage was induced in mature-green fruits by controlled temperature treatment and samples of the fruits were challenged at various times during this process with a combined heat-and-light treatment known to cause sunscald, SOD activity was found to be inversely related to the susceptibility of the fruit to sunscald damage. It is suggested that superoxide is involved in sunscald injury to tomatoes and that tolerance is acquired through increases in SOD activity. Possibly SOD acts as a general protective agent against photodynamic damage to green tissues in plants that have become conditioned as the result of normal d

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Author

Haim D. Rabinowitch; David Sklan

Publisher

Springer-Verlag; Springer Verlag; Springer Science and Business Media LLC; Society for Mining, Metallurgy and Exploration Inc. (ISSN 0032-0935)

Published

1980

Language

EN

Field

Agricultural and Biological Sciences (Life Sciences)