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. 1973 Nov;52(5):466–471. doi: 10.1104/pp.52.5.466

Participation of Ethylene in Common Purslane Response to Dicamba 1,2

Maria Stacewicz-Sapuncakis a,3, Herbert V Marsh Jr a, Jonas Vengris a, Paul H Jennings a, Trevor Robinson a
PMCID: PMC366525  PMID: 16658585

Abstract

The responses of common purslane (Portulaca oleracea L.) plants to 2-methoxy-3,6-dichlorobenzoic acid (dicamba) were found to be similar in many respects to ethylene fumigation effects. Dicamba and ethylene increased the permeability of cell membranes in purslane tissues. An increased efflux of electrolytes was observed in the bending region of the stems of dicamba-treated plants. Epinastic leaves after dicamba (10 micrograms) and ethylene (microliter per liter) treatments showed an increased efflux of rubidium. The permeability effects were observable within 1 day after dicamba or ethylene application. Protein metabolism in purslane leaves was not influenced by dicamba until 2 days after treatment, as indicated by reduced nitrate reductase activity. Inhibition of phenylalanine-U-14C incorporation into protein was observed 3 days after treatment. Ethylene reduced both phenylalanine-U-14C incorporation into protein and nitrate reductase activity within 1 day. Dicamba caused a rapid increase in ethylene production in purslane plants to levels many times greater than those observed in untreated plants. It was concluded that the dicamba-enhanced production of ethylene is responsible for many of the observed effects of the herbicide.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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