HRAC GROUP 5 (LEGACY C1 C2) RESISTANT AMERICAN SLOUGHGRASS
(Beckmannia syzigachne)

PSII inhibitors - Serine 264 Binders HRAC Group 5 (Legacy C1 C2)

China

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INTRODUCTION AMERICAN SLOUGHGRASS American Sloughgrass (Beckmannia syzigachne) is a monocot weed in the Poaceae family.  In China this weed first evolved resistance to Group 5 (Legacy C1 C2) herbicides in 1993 and infests Cereals, and Wheat.   Group 5 (Legacy C1 C2) herbicides are known as PSII inhibitors - Serine 264 Binders (Inhbition of Photosynthesis at PSll - Serine 264 Binders ).  Research has shown that these particular biotypes are resistant to chlorotoluron and they may be cross-resistant to other Group 5 (Legacy C1 C2) herbicides. The 'Group' letters/numbers that you see throughout this web site refer to the classification of herbicides by their site of action. To see a full list of herbicides and HRAC herbicide classifications click here.

QUIK STATS (last updated Jun 06, 2000 ) Common Name American Sloughgrass Species Beckmannia syzigachne Group PSII inhibitors - Serine 264 Binders HRAC Group 5 (Legacy C1 C2) Herbicides chlorotoluron Location China Year 1993 Situation(s) Cereals, and Wheat Contributors - (Alphabetically) Heling Tu, and Tang-Hong Yuan  Edit this Case  |  Add New Case of Resistance  |  Add Note

NOTES ABOUT THIS BIOTYPE AREAS FOUND Tang-Hong Yuan Found in a suburb of Shanghai. Edit this Note  |  Add New Note   GENERAL Tang-Hong Yuan Due to no crop rotation or cultivation, along with 20 years use of chlortoluron. Edit this Note  |  Add New Note

ACADEMIC ASPECTS Confirmation Tests Field, Greenhouse, and Laboratory trials comparing a known susceptible American Sloughgrass biotype with this American Sloughgrass biotype have been used to confirm resistance. For further information on the tests conducted please contact the local weed scientists that provided this information.   Genetics Genetic studies on HRAC Group 5 resistant American Sloughgrass have not been reported to the site.  There may be a note below or an article discussing the genetics of this biotype in the Fact Sheets and Other Literature   Mechanism of Resistance The mechanism of resistance for this biotype is either unknown or has not been entered in the database.  If you know anything about the mechanism of resistance for this biotype then please update the database.   Relative Fitness There is no record of differences in fitness or competitiveness of these resistant biotypes when compared to that of normal susceptible biotypes.  If you have any information pertaining to the fitness of Group 5 (Legacy C1 C2) resistant American Sloughgrass from China please update the database.   Edit Case  |  Add Note  |  Add Article  |  Add New Case  |  Help

CONTRIBUTING WEED SCIENTISTS HELING TU Quinghai Academy Of Agricultural Science 464 Plant& Soil Sciences Building Xining, Qinghai China TANG-HONG YUAN Shanghai Academy Of Agricultural Sciences Plant Protection Institute 26 No555 Shanghai, Qinghai China Email Tang-Hong Yuan

ACKNOWLEDGEMENTS The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in China have been instrumental in providing you this information. Particular thanks is given to Heling Tu, and Tang-Hong Yuan for providing detailed information.

Herbicide Resistant American Sloughgrass Globally (Beckmannia syzigachne) Herbicide Resistant American Sloughgrass Globally (Beckmannia syzigachne) Drag a column header and drop it here to group by that column Herbicide Resistant American Sloughgrass Globally (Beckmannia syzigachne) # Country Country StateName FirstYear Situation Active Ingredients CountryID Site of Action WeedID Species CommonName ResistID 1 China China   1993 Cereals, and Wheat chlorotoluron 9 PSII inhibitors - Serine 264 Binders ( HRAC Group 5 (Legacy C1 C2) 31 Beckmannia syzigachne American Sloughgrass 70 2 China China   2010 Winter wheat fenoxaprop-ethyl 9 Inhibition of Acetyl CoA Carboxylase ( HRAC Group 1 (Legacy A) 31 Beckmannia syzigachne American Sloughgrass 5609 3 Japan Japan   2010 Spring Barley, and Wheat trifluralin 25 Inhibition of Microtubule Assembly ( HRAC Group 3 (Legacy K1) 31 Beckmannia syzigachne American Sloughgrass 7768

Literature about Similar Cases

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Li YiWei ; Chen YiFeng ; Li YongFeng ; Tang RiSheng ; Mei ChuanSheng. 1997. Inductive resistance to chlorsulfuron in Beckmannia syzigachne and Alopecurus japonicum in vitro. Jiangsu Journal of Agricultural Sciences 13 : 85 - 89.

In vitro experiments were conducted to study the characteristics of induced resistance to chlorsulfuron in subcultures of Beckmannia syzigachne and Alopecurus japonicum young-panicle callus tissue. Results indicated that the sensitivity of acetolactate synthase (ALS) decreased in both the weed species with increasing chlorsulfuron concentration. The IC₅₀ (the concentration causing 50% inhibition) of ALS activity increased from 1 to 300 µg/litre for 6-12 subcultures of B. syzigachne and from 1 to 100 µg for 4-10 subcultures of A. japonicum. Induced resistance was also observed in regenerated plantlets of B. syzigachne; resistant plantlets from subcultures exposed to high levels of chlorsulfuron suffered less inhibition of growth when exposed to 200 µg and fewer died when exposed to 1000 µg than did those regenerated from subcultures with a history of lower level chlorsulfuron exposure. Callus growth and differentiation, and plantlet development in B. syzigachne were unaffected by chlorsulfuron during subculturing..

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Cite this site as: Heap, I.  The International Survey of Herbicide Resistant Weeds.  Online.  Internet.  Tuesday, April 16, 2024 .  Available  www.weedscience.org
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