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Effect and metabolism of the chloroacetamide herbicide metazachlor: Comparison of plant cell suspension cultures and seedlings



Effect and metabolism of the chloroacetamide herbicide metazachlor: Comparison of plant cell suspension cultures and seedlings



Journal of Pesticide Science 19(2): 127-135



Biological activity and fate of metazachlor were compared in cell suspension cultures and seedlings from rice and spinach. Growth of cell cultures was not (rice) or only slightly (spinach) inhibited by 200 mu-M and 100 mu-M metazachlor, respectively. In contrast, seedling growth was halved with 50 nm metazachlor (rice) and 35% less with 100 mu-M (spinach). In rice seedlings, 0.1 mu-M metazachlor significantly decreased fatty acid desaturation, while 100-200 mu-M had little or no effect in the other 3 systems. Cell suspension cultures were more tolerant to metazachlor than the corresponding plant systems. Uptake could not explain tolerance since it was lowest in the most sensitive system (rice seedlings). All systems were able to metabolize metazachlor. After 72 hr spinach cell culture and seedlings fed with 200 mu-M nietazachlor still contained 3.3 and 48 mu-M parent herbicide, respectively. Rice seedlings incubated with 0.1 mu-M herbicide contained only 18 nM of parent metazachlor after 24 hr. This low but still very phytotoxic concentration of parent metazachlor in rice seedlings compared with the high and yet non-toxic concentration found in spinach suggests that metabolism via glutathione conjugation might not be the only protection mechanism in tolerant plants.

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Accession: 008517838

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