Effects of Gibberellin and Growth-retarding Chemicals on Respiration and Catalase Activity in Various Organs of Cucumber Seedlings

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Abstract
Cucumber seedlings were grown in darkness on filter paper saturated with water, gibberellin (GA), growth-retarding chemicals (mainly Amo-1618) or both GA and Amo-1618. The effects on oxygen consumption and catalase activity were studied on cotyledons, radicles, and hypocotyl tips. GA increased respiration and catalase activity of hypocotyl and cotyledons, decreased radicle respiration, and had no significant effect on its catalase activity. Amo-1618 decreased respiration of hypocotyl and cotyledons and increased that of the radicles. It stimulated catalase activity in all three organs. The inverse effects of GA and Amo-1618 on oxygen uptake and catalase activity were mutually antagonized when both compounds were applied at concentrations counteracting their opposite effects on hypocotyl elongation. No stimulating effect on catalase activity was found with most other growth-retarding chemicals. Some of them had no significant effect on the enzyme, and one even decreased its activity.

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