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Metolachlor and Alachlor Effects on Membrane Permeability and Lipid Synthesis

Jill M. Mellis, Parthan Pillai, Donald E. Davis and Bryan Truelove
Weed Science
Vol. 30, No. 4 (Jul., 1982), pp. 399-404
Stable URL: http://www.jstor.org/stable/4043633
Page Count: 6
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Metolachlor and Alachlor Effects on Membrane Permeability and Lipid Synthesis
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Abstract

Metolachlor [2-chloro-N-(2-ethyl-6-methylphenyl)-N-(2-methoxy-1-methylethyl)acetamide] at 1 × 10⁻⁵ and 1 × 10⁻⁴ M increased the leakage of previously absorbed, ³²P-labeled orthophosphate from the roots of onion (Allium cepa L.), a susceptible species, by 14 and 41 times the control values, respectively. A significant amount of ³²P leaked from the roots of the moderately susceptible species, cotton (Gossypium hirsutum L. 'DPL 61') and cucumber (Cucumis sativus L. 'Ashley'), whereas no significant loss of ³²P occurred from two tolerant species, soybean [Glycine max (L.) Merr. 'Bragg'] and corn (Zea mays L. 'Pioneer 3369A'). At either 1 × 10⁻⁷ or 1 × 10⁻⁶ M, 1,8-naphthalic anhydride (NA) prevented ³²P leakage from onion roots in the presence of 1 × 10⁻⁵ M metolachlor. High concentrations of NA [0.1% (w/v) suspensions], however, promoted ³²P leakage and did not protect onion roots from the leakage induced by high concentrations (1 × 10⁻⁴ M) of metolachlor. Neither metolachlor nor alachlor [2-chloro-2′,6′-diethyl-N-(methoxymethyl)acetanilide], at 1 × 10⁻⁴ M, inhibited the uptake of acetate-2-¹⁴C or malonic acid-2-¹⁴C into excised cotton root tips or the incorporation of the precursors into lipids. Similarly, neither herbicide inhibited phospholipid synthesis by cotton root tips. Incorporation of ¹⁴C-choline chloride into phosphatidylcholine was not significantly inhibited by metolachlor.

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