Experiments on the Relative Susceptibility of Weeds to Auxin Herbicides

Hay, J. R.

doi:10.1139/b62-135

Cited by 2 publications

(1 citation statement)

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“…The possibility that plant species differ in their affinity for the herbicide molecule at the sites of herbicidal action or in the biochemical processes with which the herbicide interferes is sometimes considered (Hay 1962, Abeles 1968, Malhotra and Hanson 1970, but little is known on this point. Most hypotheses and evidence refer to detoxification mechanisms which are thought to be more efficient in resistant than in susceptible plants.…”

Section: Introdiictionmentioning

confidence: 99%

Translocation and Complex Formation of Picloram and 2,4‐D in Wheat Seedlings

Hallmén

Eliasson

1972

Physiologia Plantarum

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Uptake, translocation and metabolism of 14C‐labelled 4‐amino‐3,5,6‐trichloropicolinic acid (picloram) and 2,4‐dichlorophenoxyacetic acid (2,4‐D) in seedlings of wheat (Triticum aestivum L.) were studied. The uptake of the herbicides through the upper surface of the first leaf was slow but was almost complete after nine days. Picloram was absorbed faster than 2,4‐D. Picloram was also translocated into the stem and the untreated leaves to a greater extent than 2,4‐D. Only small fractions of the activity were recovered from the roots and from the nutrient solution. Picloram and 2,4‐D formed water‐soluble conjugates in the tissues. These conjugates were very labile and hydrolyzed under release of the unchanged herbicides. The isotope from 2,4‐D was also incorporated in an insoluble fraction, containing cell walls and proteins. Also from this fraction biologically active 2,4‐D could be released by hydrolysis. The formation of the complexes was partly prevented by cycloheximide. It is suggested that herbicide detoxification through complex formation is of importance for the relatively low sensitivity of wheat to auxin herbicides.

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Section: Introdiictionmentioning

confidence: 99%