Journal of Plant Growth Regulation

, Volume 14, Issue 2, pp 77–84 | Cite as

Effect of drought stress, abscisic acid, and abscisic acid analogues on the efficacy of diclofop-methyl and tralkoxydim

  • Malcolm D. Devine
  • J. Curtis Harren
  • Suzanne R. Abrams
  • Lawrence V. Gusta


The effects of drought stress, abscisic acid (ABA), and four ABA analogues on diclofop-methyl and tralkoxydim efficacy were investigated in oat (Avenu sativa). Drought stress conditions (6% soil moisture content) reduced the efficacy of diclofop-methyl at 350 g ha−1, but not at 700 g ha−1. Similarly, tralkoxydim efficacy was reduced by drought stress at 62.5 and 125 g ha−1, but not at 250 g ha−1. ABA (100 μm), applied as a root drench 2 days before the herbicide, protected oat plants against all rates of diclofop-methyl and against low rates of tralkoxydim. Two ABA analogues protected oat plants from diclofop-methyl injury, whereas two others had no effect. Foliage applications of ABA were much less effective than root applications in protecting against herbicide injury. Protection by ABA and the two active analogues was dependent on the relative time of application with respect to the herbicides. Optimal protection by ABA and analogue I was obtained when they were applied between 2 days before and 1 day after diclofop-methyl application. Analogue IV protected plants when applied between 3 days before and 1 day after diclofop-methyl application. Partial protection against tralkoxydim activity by ABA was observed when it was applied between 1 day before and 1 day after herbicide application. Analogue I did not afford any protection against tralkoxydim, and analogue IV afforded partial protection when applied the same day or 1 day after tralkoxydim. The results indicate that protection against these postemergence herbicides, similar to that conferred by water stress, can be induced by ABA and structural analogues that apparently mimic the action of ABA.


Drought Stress Soil Moisture Content Freezing Tolerance Herbicide Application Herbicide Activity 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.



soil moisture content


abscisic acid


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Copyright information

© Springer-Verlag New York Inc 1995

Authors and Affiliations

  • Malcolm D. Devine
    • 1
  • J. Curtis Harren
    • 1
  • Suzanne R. Abrams
    • 3
  • Lawrence V. Gusta
    • 2
  1. 1.Department of Crop Science and Plant EcologyUniversity of SaskatchewanSaskatoonCanada
  2. 2.Crop Development Centre, University of SaskatchewanSaskatoonCanada
  3. 3.NRC Plant Biotechnology InstituteSaskatoonCanada

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