HRAC GROUP 2 (LEGACY B) RESISTANT FIELD DODDER
(Cuscuta pentagona (=C. campestris))

Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)

Israel

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INTRODUCTION FIELD DODDER Field Dodder (Cuscuta pentagona (=C. campestris)) is a dicot weed in the Cuscutaceae family.  In Israel this weed first evolved resistance to Group 2 (Legacy B) herbicides in 1994 and infests Forests.   Group 2 (Legacy B) herbicides are known as Inhibition of Acetolactate Synthase (Inhibition of Acetolactate Synthase ).  Research has shown that these particular biotypes are resistant to chlorsulfuron, and sulfometuron-methyl and they may be cross-resistant to other Group 2 (Legacy B) 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 Field Dodder Species Cuscuta pentagona (=C. campestris) Group Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B) Herbicides chlorsulfuron, and sulfometuron-methyl Location Israel Year 1994 Situation(s) Forests Contributors - (Alphabetically) Baruch Rubin  Edit this Case  |  Add New Case of Resistance  |  Add Note

NOTES ABOUT THIS BIOTYPE AREAS FOUND Baruch Rubin Ganot Junction. Edit this Note  |  Add New Note   GENERAL Baruch Rubin Parasitic weed found on resistant Amaranthus blitoides. Rubin, B. 1995. Herbicide resistance outside north America and Europe : Causes and Significance. Proc. Int. Symp. on Weed & Crop Resistance to Herbicides. Cordoba, Spain. April 1995. Edit this Note  |  Add New Note

ACADEMIC ASPECTS Confirmation Tests Field, Greenhouse, and Laboratory trials comparing a known susceptible Field Dodder biotype with this Field Dodder 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 2 resistant Field Dodder 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 2 (Legacy B) resistant Field Dodder from Israel please update the database.   Edit Case  |  Add Note  |  Add Article  |  Add New Case  |  Help

CONTRIBUTING WEED SCIENTISTS BARUCH RUBIN Professor Hebrew University Of Jerusalem Inst. Plant Sci. & Genetics In Agriculture Faculty Of Agric. Food & Environm. Rehovot, 76100, Israel Israel Email Baruch Rubin

ACKNOWLEDGEMENTS The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in Israel have been instrumental in providing you this information. Particular thanks is given to Baruch Rubin for providing detailed information.

Herbicide Resistant Field Dodder Globally (Cuscuta pentagona (=C. campestris)) Herbicide Resistant Field Dodder Globally (Cuscuta pentagona (=C. campestris)) Drag a column header and drop it here to group by that column Herbicide Resistant Field Dodder Globally (Cuscuta pentagona (=C. campestris)) # Country Country StateName FirstYear Situation Active Ingredients CountryID Site of Action WeedID Species CommonName ResistID 1 Israel Israel   1994 Forests chlorsulfuron, and sulfometuron-methyl 23 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B) 69 Cuscuta pentagona (=C. campestris) Field Dodder 104

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Jiang, L. J. ; Qu, F. ; Li ZhaoHu ; Doohan, D.. 2013. Inter-species protein trafficking endows dodder (Cuscuta pentagona) with a host-specific herbicide-tolerant trait. New Phytologist 198 : 1017 - 1022.

Besides photosynthates, dodder (Cuscuta spp.) acquires phloem-mobile proteins from host; however, whether this could mediate inter-species phenotype transfer was not demonstrated. Specifically, we test whether phosphinothricin acetyl transferase (PAT) that confers host plant glufosinate herbicide tolerance traffics and functions inter-specifically. Dodder tendrils excised from hosts can grow in vitro for weeks or resume in vivo by parasitizing new hosts. The level of PAT in in vivo and in vitro dodder tendrils was quantified by enzyme-linked immunosorbent assay. The glufosinate sensitivity was examined by dipping the distal end of in vivo and in vitro tendrils, growing on or excised from LibertyLink® (LL; PAT-transgenic and glufosinate tolerant) and conventional (CN; glufosinate sensitive) soybean hosts, into glufosinate solutions for 5 s. After in vitro tendrils excised from LL hosts reparasitized new CN and LL hosts, the PAT level and the glufosinate sensitivity were also examined. When growing on LL host, dodder tolerated glufosinate and contained PAT at a level of 0.3% of that encountered in LL soybean leaf. After PAT was largely degraded in dodders, they became glufosinate sensitive. PAT mRNA was not detected by reverse transcription PCR in dodders. In conclusion, the results indicated that PAT inter-species trafficking confers dodder glufosinate tolerance..

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