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Morphological and Histological Effects of Three Grass Selective Herbicides on Developing Wild Oat (Avena fatua) Stems

Published online by Cambridge University Press:  12 June 2017

Rakesh Jain  and
William H. Vanden Born
Rakesh Jain
Affiliation:
Dep. Plant Sci., Univ. Alberta, Edmonton, Alta., Canada T6G 2P5
William H. Vanden Born
Affiliation:
Dep. Plant Sci., Univ. Alberta, Edmonton, Alta., Canada T6G 2P5
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Abstract

Three grass selective herbicides, sethoxydim, fluazifop, and haloxyfop, applied to wild oat plants at the five-leaf stage inhibited growth and induced chlorosis in leaves. Young and actively growing tissues were affected first. Stem elongation in wild oat was inhibited within 2 days of treatment with sethoxydim and within 5 days of treatment with fluazifop or haloxyfop. At these same observation times, internodes that were elongating rapidly at the time of treatment were constricted at the base. These symptoms were followed by necrosis of the internode tissue. Histological examination of the affected internodes indicated that the herbicides inhibited cell division in very young internodes and inhibited both cell division and cell elongation in slightly older internodes. Initial injury occurred in the epidermal, cortical, and procambium cells of the peripheral regions of the stems located at the base of the affected internodes. Necrosis then progressed to the center of the stem tissue and all cells in the internodes were killed within 14 days of treatment. All three herbicides caused similar morphological and histological effects on developing wild oat stems.

Keywords

Fluazifop, (±)-2-[4-[[5-(trifluoromethyl)-2-pyridinyl]oxy]phenoxy]propanoic acidhaloxyfop, 2-[4-[[3-chloro-5-(trifluoromethyl)-2-pyridinyl]oxy]-phenoxy]propanoic acidsethoxydim, 2-[1-(ethoxy-imino)butyl]-5-[2-(ethylthio)propyl]-3-hydroxy-2-cyclohexen-1-onewild oat, Avena fatua L. ♯3 AVEFASethoxydimfluazifophaloxyfopinternodesAVEFA
Type
Weed Control and Herbicide Technology
Information
Weed Science , Volume 37 , Issue 4 , July 1989 , pp. 575 - 584
Copyright
Copyright © 1989 by the Weed Science Society of America 

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