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This article in AJ

  1. Vol. 59 No. 4, p. 364-366
     
    Received: Mar 13, 1967
    Published: July, 1967


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doi:10.2134/agronj1967.00021962005900040022x

Factors in Paraquat-Induced Chlorosis with Phaseolus Foliar Tissues1

  1. Don L. Barnes and
  2. J. Q. Lynd2

Abstract

Abstract

Bioassay procedures with leaf disks from Phaseolus vulgaris L., Indian bean, were used to determine factors influencing ( 1,1′-dimethyl-4,4'bipyridinium) paraquat activity. Relative phytotoxicity was determined by varying herbicide levels from 0 to 1.0 ppm ai with light intensity, temperature and reaction time. Reduction of extractable chlorophyll was closely related to increased paraquat concentrations. Increased time, temperature and light intensity accelerated rate and magnitude of leaf disk chlorosis induced with active paraquat levels.

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