INTERNATIONAL HERBICIDE-RESISTANT WEED DATABASE

HRAC GROUP 27 (LEGACY F2) RESISTANT CHINESE SPRANGLETOP
(Leptochloa chinensis)


Inhibition of Hydroxyphenyl Pyruvate Dioxygenase HRAC Group 27 (Legacy F2)

China, Hunan
INTRODUCTION CHINESE SPRANGLETOP
Chinese Sprangletop (Leptochloa chinensis) is a monocot weed in the Poaceae family.  In China this weed first evolved resistance to Group 27 (Legacy F2) herbicides in 2023 and infests Rice.   Group 27 (Legacy F2) herbicides are known as Inhibition of Hydroxyphenyl Pyruvate Dioxygenase (Inhibition of Hydroxyphenyl Pyruvate Dioxygenase ).  Research has shown that these particular biotypes are resistant to tripyrasulfone and they may be cross-resistant to other Group 27 (Legacy F2) 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.

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QUIK STATS (last updated Feb 02, 2023 )

Common NameChinese Sprangletop
SpeciesLeptochloa chinensis
GroupInhibition of Hydroxyphenyl Pyruvate Dioxygenase HRAC Group 27 (Legacy F2)
Herbicidestripyrasulfone
LocationChina, Hunan
Year2023
Situation(s)Rice
Contributors - (Alphabetically)Ian Heap 
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NOTES ABOUT THIS BIOTYPE

MECHANISM

First report on resistance to HPPD herbicides mediated by nontarget-site mechanisms in the grass Leptochloa chinensis. Author(s) : Ju BoMing ;  Liu Min ;  Fang YuHang ;  Liu LeiCheng ;  Pan Lang Author Affiliation : Hunan Agricultural University, Changsha 410128, China.

Author Email : langpan@hunau.edu.cn

Journal article : Journal of Agricultural and Food Chemistry 2023 Vol.71 No.46 pp.17669-17677

Abstract : The emergence of 4-hydroxyphenylpyruvate dioxygenase (HPPD) herbicides as efficacious target-site herbicides has been noteworthy. In recent years, only four species of broadleaf weeds have developed resistance due to the long-term widespread use of HPPD herbicides. This study represents the first reported instance of a grass weed exhibiting resistance to HPPD inhibitors. We identified a new HPPD-resistant Chinese sprangletop [Leptochloa chinensis (L.) Nees] population (R population). At the recommended dose of tripyrasulfone, the inhibition rate of the R population was only half that of the sensitive population (S). The mechanism underlying resistance does not involve target-site resistance triggered by amino acid mutations or depend on disparities within the HPPD INHIBITOR SENSITIVE 1 (HIS1) gene. The impetus for resistance appears to be interlinked with the metabolic activities of cytochrome P450 monooxygenase (P450) and glutathione S-transferase (GST) family genes. Following RNA sequencing (RNA-seq) and quantitative real-time PCR (qRT-PCR) validation, the study suggests that five P450 genes, CYP71C1CYP74A2CYP72A1CYP84A1, and CYP714C2, alongside a single GST gene GSTF1, may be implicated in the process of metabolic detoxification. ISSN : 0021-8561 DOI : 10.1021/acs.jafc.3c04323

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ACADEMIC ASPECTS

Confirmation Tests

Greenhouse, and Laboratory trials comparing a known susceptible Chinese Sprangletop biotype with this Chinese Sprangletop 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 27 resistant Chinese Sprangletop 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

Studies on the mechanism of resistance of Group 27 (Legacy F2) resistant Chinese Sprangletop from China indicate that resistance is due to an altered target site.  There may be a note below or an article discussing the mechanism of resistance in the Fact Sheets and Other Literature
 
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 27 (Legacy F2) resistant Chinese Sprangletop from China please update the database.
 
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CONTRIBUTING WEED SCIENTISTS

IAN HEAP
Director
International Survey of Herbicide-Resistant Weeds
P.O. Box 1365
Corvallis, 97339, Oregon
United States
Email Ian Heap
Web   : Web Site Link

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 Ian Heap for providing detailed information.
Herbicide Resistant Chinese Sprangletop Globally
(Leptochloa chinensis)
Herbicide Resistant Chinese Sprangletop Globally
(Leptochloa chinensis)
Drag a column header and drop it here to group by that column
Herbicide Resistant Chinese Sprangletop Globally
(Leptochloa chinensis)
#CountryFirstYearSituationActive IngredientsSite of Action
1 ChinaChina 2011 Rice cyhalofop-butyl 9 Inhibition of Acetyl CoA Carboxylase ( HRAC Group 1 (Legacy A)
223Leptochloa chinensisChinese Sprangletop5671
2 ChinaChina 2023 Rice tripyrasulfone 9 Inhibition of Hydroxyphenyl Pyruvate Dioxygenase ( HRAC Group 27 (Legacy F2)
223Leptochloa chinensisChinese Sprangletop27268
3 MalaysiaMalaysia 2006 Rice propanil 28 PSII inhibitors - Serine 264 Binders ( HRAC Group 5 (Legacy C1 C2)
223Leptochloa chinensisChinese Sprangletop10948
4 South KoreaSouth Korea 2012 Rice cyhalofop-butyl, fenoxaprop-ethyl, and metamifop 27 Inhibition of Acetyl CoA Carboxylase ( HRAC Group 1 (Legacy A)
223Leptochloa chinensisChinese Sprangletop7855
5 ThailandThailand 2002 Rice fenoxaprop-ethyl, profoxydim, and quizalofop-ethyl 47 Inhibition of Acetyl CoA Carboxylase ( HRAC Group 1 (Legacy A)
223Leptochloa chinensisChinese Sprangletop5199
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Heap, I.  The International Herbicide-Resistant Weed Database.  Online.  Thursday, June 20, 2024 .  Available  www.weedscience.org Copyright © 1993- 2024 WeedScience.org All rights reserved. Fair use of this material is encouraged. Proper citation is requested.