<b>HRAC Group 2</b> <font size='2'> (Legacy B) </font> resistant Rorippa indica from China

INTERNATIONAL HERBICIDE-RESISTANT WEED DATABASE

HRAC GROUP 2 (LEGACY B) RESISTANT VARIABLELEAF YELLOWCRESS
(Rorippa indica)

Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)

China

INTRODUCTION		VARIABLELEAF YELLOWCRESS
Variableleaf Yellowcress (Rorippa indica) is a dicot weed in the Brassicaceae family. In China this weed first evolved resistance to Group 2 (Legacy B) herbicides in 2011 and infests Winter wheat. 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 tribenuron-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 Feb 09, 2013 )
Common Name	Variableleaf Yellowcress
Species	Rorippa indica
Group	Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
Herbicides	tribenuron-methyl
Location	China
Year	2011
Situation(s)	Winter wheat
Contributors - (Alphabetically)	Tao Jin, and Xuegang Peng
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ACADEMIC ASPECTS

Confirmation Tests

Field, and Greenhouse trials comparing a known susceptible Variableleaf Yellowcress biotype with this Variableleaf Yellowcress 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 Variableleaf Yellowcress 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 Variableleaf Yellowcress from China please update the database.

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CONTRIBUTING WEED SCIENTISTS

TAO JIN

Shandong Agricultural University College Of Plant Protection Daizong Road 61# Tai'an, 271018 China Email Tao Jin

XUEGANG PENG

Research Associate Qingdao kingagroot Ltd. Research institute of maligant weeds Qingdao Daizong Road 61# Tai'an, 271018 China Email Xuegang Peng

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 Tao Jin, and Xuegang Peng for providing detailed information.

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Herbicide Resistant Variableleaf Yellowcress Globally
(Rorippa indica)

Country

FirstYear

Situation

Active Ingredients

Site of Action

China

2011

Winter wheat

tribenuron-methyl

Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)

Literature about Similar Cases

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Zhao, Xx; Xia, Qx; Lu, Dl; Lu, Wp; Qi, Ck; Pu, Hm (More...)Liu, Gs; Zhao, J; Wang, Yp. 2006. Gene flow from genetically modified herbicide-resistant rapeseed to cruciferous weeds. Progress In Natural Science 16 : 936 - 941.

The sexual compatibility between genetically modified (GM) glyphosate-resistant rapeseed variety Q3 (Brassica napus L.) and 5 cruciferous weeds is studied through the observation of fluorescence microscopy and cross-fertility after manual pollination. The results indicated that Q3 (as male) was highly incompatible with Thlaspi arvense L., Capsella bursa-pastoris (L.) Medic, Cardamine hirsuta L. and Rorippa palustris (L.) Besser (as female). Fluorescence microscopic observation showed that growing of pollen tubes terminated on the stigma surface or at the upper 1/3 part of the style. However, B. juncea X Q3 was compatible, and the compatibility index was 1.65. Under the neighboring growth and natural pollination conditions, the rates of gene flow from Q3 to T. arvense, C. bursa-pastoris, C. hirsute and R. palustris were all 0, while it was 0.86% for B. juncea. These results indicate that there is difference in the rate of gene flow between GM rapeseed and cruciferous wild weeds, and frequency of gene flow is highly correlated with sexual compatibility.

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