Effect of fenoxaprop on acetyl-coa carboxylase activtiy in rice and two grass weeds

Issue Date

7-1999

Abstract

The susceptibility of Echinochloa crusgalli (L.) Beauv. and Echinochloa glabrescens Munro ex Hook f. and the tolerance of rice (Oryza sativa L.) to fenoxaprop were evaluated by assaying acetyl-CoA carboxylase (ACCase, EC 6.4.1.2) activity in partially purified ACCase preparations. ACCase was extracted from leaf tissues of rice and two grasses, E. crusgalli and E. glabrescens, at the 3-4 leaf, 5-6 leaf, and tillering stages and partially purified by ammonium sulfate fractionation and gel filtration. The ACCase activity increased with plant age, with highest enzyme activity Che at tillering in all three species. There was also an age-dependent increase in ACCase bonusor sensitivity to inhibition by fenoxaprop. At tillering, a 1.7-fold difference in I50, the concentration needed to give 50% inhibition, between rice and E. crusgalli and a 1.8-fold difference between rice and E. glabrescens were observed. The I values showed significant differences not only at tillering but also at other growth stages. The results suggest that the tolerance of rice and the susceptibilities of E. crusgalli and E. glabrescens to fenoxaprop can be attributed to differential sensitivities of ACCase to fenoxaprop inhibition.

Source or Periodical Title

Philippine Agricultural Scientist, The (Formerly: The Philippine Agriculturist)

ISSN

0031-7454

Volume

82

Issue

3

Page

300-312

Document Type

Article

College

College of Agriculture and Food Science (CAFS)

Frequency

quarterly

En – AGROVOC descriptors

RICE; ORYZA; GRASS WEEDS; BARNYARD MILLET; CARBOXYLYASES; FENOXAPROP; ECHINOCHLOA CRUS-GALLI; ARYLOXYPHENOXYPROPIONIC ACID HERBICIDES; PURIFICATION; EXTRACTION

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