The Fate of 2,4-Dichlorophenoxyacetic Acid in Bean Seedlings. II. Translocation.

Hay, J. R.; Thimann, Kenneth V.

doi:10.1104/pp.31.6.446

Cited by 30 publications

(8 citation statements)

References 14 publications

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“…Different herbicide levels in stems and leaves could also contribute to the different oxidative metabolism responses observed in these two organs. In susceptible plants treated either by leaves or by roots with 2,4-D, overproduced ET is known to inhibit 2,4-D polar transport toward the stem, giving rise to lower levels of herbicide in stems as compared to leaves and roots (Hay and Thimann 1956;Hay 1957;Apelbaum and Burg 1972;Grossmann 2010). Thus, it is possible that lower levels of 2,4-D in the stems of pea plants might have caused less injuries in these organs as compared to the leaves.…”

Section: Resultsmentioning

confidence: 97%

Organ-specific effects of the auxin herbicide 2,4-D on the oxidative stress and senescence-related parameters of the stems of pea plants

et al. 2011

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Oxidative stress and senescence have been shown to participate in the toxicity mechanism of auxin herbicides in the leaves and roots of sensitive plants. However, their role in stem toxicity has not been studied yet. In this work, we report the effect of foliar or root applications of the auxin herbicide 2,4-dichlorophenoxyacetic acid (2,4-D) on the parameters of oxidative stress and senescence of stems of pea (Pisum sativum L.) plants. Contrary to their effect on the pea leaves, in the stems 2,4-D applications did not cause oxidative stress, as shown by the parameters of lipid peroxidation, protein carbonyls, and total and protein thiols. Moreover, they inhibited the superoxide radical (O 2 .-)-producing xanthine oxidase (XOD) activity and stimulated the antioxidant activities of catalase (CAT), guaiacol peroxidase (GPOX), ascorbate peroxidase (APX), glutathione reductase (GR), glutathione S-transferase (GST) and Krebs cycle NAD ? -isocitrate dehydrogenase (IDH). Applications of 2,4-D also did not induce senescence in the pea stems, as shown by the increase of proteins, the lack of stimulation of proteolytic activity, and the inhibition of senescence-related isocitrate lyase (ICL) activity. However, they stimulated the H 2 O 2 -producing acyl-CoA oxidase (ACOX) activity of fatty acid beta oxidation. Results suggest that oxidative stress and senescence are not involved in the mechanism of toxicity of 2,4-D in the stems of pea plants, and that these phenomena are not whole-plant toxicity mechanisms for auxin herbicides in susceptible plants.Results also suggest that the effect of 2,4-D on the oxidative metabolism of pea plants might be organ-specific.

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Section: Resultsmentioning

confidence: 97%

Organ-specific effects of the auxin herbicide 2,4-D on the oxidative stress and senescence-related parameters of the stems of pea plants

et al. 2011

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“…This shows its ready removal from the phloem. None of the herbicide ever entered the roots (52). The same poor phloem mobility was found with marabu (Dichrostachys nutans), a woody plant native to Africa that covers vast areas of valuable land in Cuba in a dense jungle.…”

Section: Movement Of Applied Substancesmentioning

confidence: 95%

“…It has been shown for potassium and phosphorus that a nutritional deficiency may be a limiting factor (97,99). Temperature, formulation, the use of surfactants, place of application, etc., are other im portant factors (2,20,52,70,127).…”

Section: Movement Of Applied Substancesmentioning

confidence: 99%

Transport in the Phloem

Zimmermann¹

1960

Annu. Rev. Plant. Physiol.

222

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“…It has been established for some time that translocation of growth substances is dependent upon, and coincides with, the transport of assimilates from leaves, and that movement of such substances does not take place from chlorotic leaves (7) or from starved leaves (1,2,10,11,13,15).…”

Section: Introductionmentioning

confidence: 99%

Effects of High Humidity on Translocation of Foliar-applied Labeled Compounds in Plants. II. Translocation from Starved Leaves

1963

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The Fate of 2,4-Dichlorophenoxyacetic Acid in Bean Seedlings. II. Translocation.

Cited by 30 publications

References 14 publications

Organ-specific effects of the auxin herbicide 2,4-D on the oxidative stress and senescence-related parameters of the stems of pea plants

Organ-specific effects of the auxin herbicide 2,4-D on the oxidative stress and senescence-related parameters of the stems of pea plants

Transport in the Phloem

Effects of High Humidity on Translocation of Foliar-applied Labeled Compounds in Plants. II. Translocation from Starved Leaves

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