MICROBIAL DEGRADATION OF HYDROXY-DERIVATIVES OF S-TRIAZINE HERBICIDES

AbstractThe triazines are one of the most widely used herbicide classes ever developed and are critical for managing weed populations that have developed herbicide resistance. These herbicides are traditionally valued for their residual weed control in more than 50 crops. Scientific literature suggests that atrazine, and perhaps others-triazines, may no longer remain persistent in soils due to enhanced microbial degradation. Experiments examined the rate of degradation of atrazine and two other triazine herbicides, simazine and metribuzin, in both atrazine-adapted and non-history Corn Belt soils, with similar soils being used from each state as a comparison of potential triazine degradation. In three soils with no history of atrazine use, thet1/2of atrazine was at least four times greater than in three soils with a history of atrazine use. Simazine degradation in the same three sets of soils was 2.4 to 15 times more rapid in history soils than non-history soils. Metribuzin in history soils degraded at 0.6, 0.9, and 1.9 times the rate seen in the same three non-history soils. These results indicate enhanced degradation of the symmetrical triazine simazine, but not of the asymmetrical triazine metribuzin.

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Chlorophenols and other related derivatives of environmental concern: Properties, distribution and microbial degradation processes

Chemosphere ◽

10.1016/j.chemosphere.2011.04.009 ◽

2011 ◽

Vol 83 (10) ◽

pp. 1297-1306 ◽

Cited By ~ 223

Author(s):

Ademola O. Olaniran ◽

Etinosa O. Igbinosa

Keyword(s):

Microbial Degradation ◽

Environmental Concern ◽

Degradation Processes ◽

Derivatives Of

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Microbial Degradation of s-Triazine Herbicides

The Triazine Herbicides ◽

10.1016/b978-044451167-6.50025-8 ◽

2008 ◽

pp. 301-328 ◽

Cited By ~ 13

Author(s):

Raphi T. Mandelbaum ◽

Michael J. Sadowsky ◽

Lawrence P. Wackett

Keyword(s):

Microbial Degradation ◽

Triazine Herbicides

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Studies on the Mode of Action of s-Triazine Herbicides : 1. Differences among the derivatives of s-triazine in phytotoxicity for rice plant and barnyardgrass at the germinating stage.

Japanese Journal of Crop Science ◽

10.1626/jcs.36.3_310 ◽

1967 ◽

Vol 36 (3) ◽

pp. 310-314 ◽

Cited By ~ 1

Author(s):

Masao ARAI ◽

Shooji FURUYA ◽

Masuzi MIYAHARA

Keyword(s):

Mode Of Action ◽

Rice Plant ◽

Triazine Herbicides ◽

Derivatives Of

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Photosynthetic Electron Transport Inhibition by 2-Substituted 4-Alkyl-6-benzylamino-1,3,5-triazines with Thylakoids from Wild-Type and Atrazine-Resistant Chenopodium album

Zeitschrift für Naturforschung C ◽

10.1515/znc-2002-11-1210 ◽

2002 ◽

Vol 57 (11-12) ◽

pp. 1009-1015 ◽

Cited By ~ 1

Author(s):

Ruiko Okano ◽

Aiko Ohki ◽

Shinpei Ohki ◽

Hitoshi Kohno ◽

Jack J. S. van Rensen ◽

...

Keyword(s):

Electron Transport ◽

Chenopodium Album ◽

Photosynthetic Electron Transport ◽

Resistance Ratio ◽

Triazine Herbicides ◽

Inhibition Assay ◽

Wild Type ◽

Amino Groups ◽

Triazine Derivatives ◽

Derivatives Of

The effect of 2-benzylamino-1,3,5-triazines on photosynthetic electron transport (PET) was measured with thylakoids isolated from atrazine-resistant, wild-type Chenopodium album, and spinach to find novel 1,3,5-triazine herbicides bearing a strong PET inhibition. The PET inhibition assay with Chenopodium (wild-type and resistant), yielded a resistance ratio (R/ W = I50 (resistant)/I50 (wild-type)) of 324 for atrazine while for benzylamino-1,3,5-triazine derivatives of diamino-1,3,5-triazines a R/W of 11 to 160 was found. The compounds having a benzylamino group at one of the amino groups in the diamino-1,3,5-triazines have a resistant ratio down to one half to 1/30 of the atrazine value. The average resistance ratio of 21 benzylamino derivatives of monoamino-1,3,5-triazines was found to be about 4.0. The inhibition of 21 benzylamino-1,3,5-triazines assayed with atrazine-resistant Chenopodium thylakoids, indicated by pI50 (R) -values, correlated well with the PET inhibition pI50 (W) of wildtype thylakoids from Chenopodium.

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