Effect of chlorsulfuron on ethylene evolution from sunflower seedlings

  • Jeffrey C. Suttle
Article

Abstract

The effect of the herbicide chlorsulfuron (2-chloro-N-[(4-methoxy - 6 - methyl -1, 3,5 - triazin - 2 - yl)aminocarbonyl]benzenesulfonamide) on ethylene production in light-grown sunflower (Helianthus annuus L.) seedlings was examined. Application of chlorsulfuron to the apex stimulated ethylene production in all tissues examined: cotyledons, hypocotyls, and roots. The greatest stimulation occurred in the upper portion of the hypocotyl adjacent to, and including, the cotyledonary node. Ethylene evolution from hypocotyls excised from treated seedlings was stimulated over control levels 1 day after herbicide application and reached a maximum (approx. 75 x control or 17 nl/g f wt/h) 2 to 3 days after treatment. Labeling and inhibitor studies indicated that the ethylene produced was derived primarily from methionine. Chlorsulfuron treatment stimulated the rate of accumulation of the ethylene precursor, 1-aminocyclopropane-1-carboxylic acid (ACC), as well as the ability of the tissue to convert exogenous ACC to ethylene. Chlorsulfuron had little effect on ethylene production when administered to the hypocotylsin vitro. Removal of the cotyledons from treated seedlings reduced the rate of ethylene evolution from the hypocotyls. These results suggest that stimulation of ethylene production in sunflower hypocotyls by chlorsulfuron is not a wound response but rather is dependent on factors derived from the cotyledons.

Keywords

Ethylene Production Ethylene Biosynthesis Specific Radioactivity Cotyledonary Node Ethylene Evolution 

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Copyright information

© Springer-Verlag 1983

Authors and Affiliations

  • Jeffrey C. Suttle
    • 1
  1. 1.United States Department of Agriculture, Agricultural Research Service, Metabolism and Radiation Research LaboratoryState University StationFargoUSA

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