Herbicidal action and selectivity mechanism of bensulfuron metye.

Takeda, Shigemitsu; Yuyama, Takeshi; Ackerson, Robert C.

doi:10.3719/weed.34.87

Cited by 6 publications

(7 citation statements)

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“…quadrifolia . However, the first edition of the Red Data Book (Endangered Plant Survey Group 1989) referring to the population decreases of these species was published before the use of BSM became common (Takeda et al . 1989).…”

Section: Discussionmentioning

confidence: 99%

“…natans, A. japonica and M. quadrifolia. However, the first edition of the Red Data Book (Endangered Plant Survey Group 1989) referring to the population decreases of these species was published before the use of BSM became common (Takeda et al 1989). Further experiments are needed to reveal whether other pesticides in the past are in part responsible for population decreases of the three species.…”

Section: Discussionmentioning

confidence: 99%

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Susceptibilities of some aquatic ferns to paddy herbicide bensulfuron methyl

Aida

Itoh

Ikeda

et al. 2004

Weed Biology and Management

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Paddy herbicides have the potential to cause adverse effects on non-target plants. Susceptibilities of some aquatic ferns ( Azolla japonica Franch. et Savat., Isoetes japonica A. Braun, Marsilea quadrifolia L. and Salvinia natans All.) and duckweeds ( Lemna minor L. and Spirodela polyrhiza Schleid.) to paddy herbicide bensulfuron methyl (BSM) were evaluated with a 20 day exposure experiment using 200 cm 2 pots. The BSM concentrations in the surface water of monitoring pots with no plants dissipated exponentially with half lives of 3.5 and 3.9 days at application rates of 15 and 150 g ha -1 , respectively. The BSM concentrations in the surface water 1 day after application in the culture pots were comparable among plant species, and were lower than those in the monitoring pots. Bensulfuron methyl reduced the plant growth in all species. I . japonica showed the lowest intrinsic relative growth rate (RGR) and the lowest susceptibility with an effective dose resulting in 50% growth inhibition (ED 50 ) of 21 g ha -1 . Except for I . japonica , the RGR of the duckweeds was similar to the ferns, and ED 50 for the duckweeds was higher than the ferns. ED 50 for Sa . natans , A . japonica and M . quadrifolia were 1.1, 1.8 and 1.2 g ha -1 , respectively, which were smaller than 1/20 of the recommended field dose (51-75 g ha -1 ) and ranged from 1/2 to 1/6 of ED 50 for L . minor and Sp . polyrhiza (6.5 and 3.2 g ha -1 , respectively). These results suggest that BSM application in paddy fields and its runoff in some localities is expected to have adverse effects on the growth of Sa . natans , A . japonica and M . quadrifolia .

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Susceptibilities of some aquatic ferns to paddy herbicide bensulfuron methyl

Aida

Itoh

Ikeda

et al. 2004

Weed Biology and Management

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“…[1][2][3][4]7,8) The biochemical mechanism of plant growth inhibition by the herbicides was explained by LaRossa & Schloss8) who demonstrated that sulfometuron methyl inhibited acetolactate synthase (ALS) from Salmonella typhimurium. These findings had been extended to plant tissue using excised pea root culture.1) Ray1) and Takeda et al4) showed that ALS prepared from a variety of plants were inhibited by sulfonylurea herbicides.…”

Section: Resultsmentioning

confidence: 99%

Mode of Growth Inhibitory Activity and Metabolism of Imazosulfuron in Excised Roots of Plants

Shimizu¹,

Sakamoto²,

Kamizono³

et al. 1996

J. Pestic. Sci.

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Growth inhibition activity of imazosulfuron, 1-(2-chloroimidazo [1,2-a] pyridin-3-ylsulfonyl)-3-(4, 6-dimethoxypyrimidin-2-yl)urea, against excised pea and soybean roots was investigated. Fifty percents growth inhibition concentrations of Imazosulfuron (I50) against pea and soybean roots were 17.6 and 54.2 ppb, respectively. When the excised pea roots were incubated in the culture medium containing 25 ppb of Imazosulfuron and 1mM of either branched-chain amino acids or intermediates of their biosynthetic pathways, the growth inhibition activity of excised roots was alleviated by the combination of isoleucine and valine or a-ketoisovalerate and a-keto-f3-methyl-n-valerate. These findings suggest that Imazosulfuron exhibits inhibition of acetolactate synthase which catalyses the biosynthetic pathways of branchedchain amino acids. Metabolic fate of Imazosulfuron in excised pea roots was studied using the 14C-labeled compounds. Imazosulfuron was predominantly demethylated to afford a monodemethyl derivative (HMS) in the roots, and hydrolytically cleaved at the sulfonylurea bond to give a sulfonamide (IPSN) and an aminopyrimidine (ADPM) in the culture medium. Since HMS did not inhibit the growth of excised roots, metabolic fate of Imazosulfuron is involved in a selectivity between plants.

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“…have also been used. These ALS‐inhibiting SU herbicides are very effective in controlling various kinds of weeds other than gramineous weeds (Beyer et al 1988; Takeda et al 1989; Brown & Cotterman 1994). Pyrimidinyl carboxy herbicides are effective also towards weeds in the Echinochloa spp.…”

Section: Introductionmentioning

confidence: 99%

Metabolism and selectivity of rice herbicides in plants

Usui

2001

Weed Biology and Management

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Chemical weed control with effective and highly active herbicides has been very useful and convenient means. It has contributed to stable crop production and is labor saving. Recent herbicides have had characteristics such as high effectiveness without causing environmental pollution or harmful effects, and appropriate herbicides having high activity, low toxicity, high selectivity and being non‐persistent have been developed. The metabolism of rice herbicides used mainly in Japan, such as sulfonylurea, chloroacetamide, acylamide, urea, thiocarbamate, pyrazole, triazine, diphenyl ether, phthalimide, phenoxy, aryloxyphenoxypropionate, etc., is reviewed, and its involvement in selectivity is also discussed. The metabolism of herbicides is closely related to their activity and selectivity. Differential herbicide metabolism in plants is a contributing factor of selectivity between crops and weeds. Chemicals that are more detoxified in crops and/or more activated or less detoxified in weeds are considered as being effective and selective herbicides. The metabolism of various types of rice herbicides includes: oxidative reaction (ring and chain hydroxylation, O‐ and N‐dealkylation), hydrolysis and subsequent glucose conjugation, and glutathione conjugation in rice. These detoxicative activities are much higher in rice than weeds in paddies, and this leads to the selectivity of herbicides. Enzymes, oxidase, P‐450 mono‐oxygenase, esterase, acylamidase, glucosyl transferase, glutathione transferase, etc., play important roles in herbicide metabolism and selectivity.

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Herbicidal action and selectivity mechanism of bensulfuron metye.

Cited by 6 publications

References 0 publications

Susceptibilities of some aquatic ferns to paddy herbicide bensulfuron methyl

Susceptibilities of some aquatic ferns to paddy herbicide bensulfuron methyl

Mode of Growth Inhibitory Activity and Metabolism of Imazosulfuron in Excised Roots of Plants

Metabolism and selectivity of rice herbicides in plants

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