Characterization of very long chain fatty acid synthesis inhibition by ipfencarbazone

Ipfencarbazone exhibits excellent herbicidal activity against Echinochloa spp. and is safe for rice. The effects of ipfencarbazone on very long chain fatty acid (VLCFA) elongation in rice and late watergrass and its inhibitory mechanism were investigated in this study. Although ipfencarbazone inhibi...

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Bibliographic Details
Published in:Journal of Pesticide Science 2019/02/20, Vol.44(1), pp.20-24
Main Authors: Kasahara, Tatsuya, Matsumoto, Hiroshi, Hasegawa, Hisakazu, Koyama, Kohei, Takeuchi, Takashi
Format: Article
Language:English
Subjects:
Bulbostylis barbata
Chains
Dilution
Elongation
Fatty acids
Inhibition
ipfencarbazone
late watergrass
Low concentrations
Microsomes
mode of action
Original
Oryza
Rice
selectivity
very long chain fatty acid
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Summary:Ipfencarbazone exhibits excellent herbicidal activity against Echinochloa spp. and is safe for rice. The effects of ipfencarbazone on very long chain fatty acid (VLCFA) elongation in rice and late watergrass and its inhibitory mechanism were investigated in this study. Although ipfencarbazone inhibited VLCFA elongation in the microsomes prepared from late watergrass and rice at low concentrations, the inhibitory effect was higher in late watergrass than in rice. These results suggested that the primary site of action of ipfencarbazone is VLCFA elongase (VLCFAE) and ipfencarbazone has a differential affinity between the VLCFAEs of the plants. The inhibitory activity of ipfencarbazone became higher in proportion to pre-incubation period with the VLCFAE. The degree of inhibition did not decrease by dilution of the VLCFAE–ipfencarbazone complex. These results suggested that ipfencarbazone binds to the VLCFAE irreversibly.
ISSN:1348-589X
1349-0923
DOI:10.1584/jpestics.D18-057