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Effects of Two Diphenylether Herbicides on Common Purslane (Portulaca oleracea)

Published online by Cambridge University Press:  12 June 2017

S. F. Gorske  and
H. J. Hopen
S. F. Gorske
Affiliation:
Dep. Hortic., Univ. of Illinois, Urbana, IL 61801
H. J. Hopen
Affiliation:
Dep. Hortic., Univ. of Illinois, Urbana, IL 61801
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Abstract

Nitrofen (2,4-dichlorophenyl-p-nitrophenyl ether) and oxyfluorfen [2-chloro-1-(3-ethoxy-4-nitrophenoxy)-4-(trifluoromethyl) benzene] are 2 diphenylether herbicides which are phytoactive on common purslane (Portulaca oleracea L.). The stomata of common purslane are normally open during the day and closed at night. Nitrofen and oxyfluorfen applications to common purslane leaves cause the stomata to close which is a result of increased membrane permeability. A slight increase (0.6 C) in leaf temperature and a decrease (2 bars) in the apparent water potential was evident after 6 h. Membrane degradation caused some cells to collapse and caused the leaves to appear pitted. Ethylene synthesis was stimulated (0.9 ppmv) causing a loss of plastids from the bundle sheath cells and finally leaf abscission, 8 to 24 h after treatment.

Keywords

Nitrofenoxyfluorfenstomatal apertureplastidsabscission
Type
Research Article
Information
Weed Science , Volume 26 , Issue 6 , November 1978 , pp. 585 - 588
Copyright
Copyright © 1978 by the Weed Science Society of America 

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