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Seed Dormancy and Seedlings Physiological Response to topramezone in Green Foxtail(Setaria viridis)

Journal of Northeast Agricultural University(English Edition) 2023年第4期30卷 32-42页

作者： Ding Wei Chang Xin-yue Cheng Zhuo Cheng Peng College of Plant Protection Northeast Agricultural UniversityHarbin 150030China College of Resources and Environmental Sciences Northeast Agricultural UniversityHarbin 150030China Agricultural Technology Extension Station of Heilongjiang Province Harbin 150010China

Green foxtail(Setaria viridis)is a notorious weed in corn fields in Heilongjiang *** investigate the best method to break the seed dormancy of green foxtail and its physiological response to topramezone,this study selected newly harvested and one-year stored green foxtail seeds as research *** seeds were treated with HCl,Na OH,gibberellic acid(GA),different water temperatures and polyethylene glycol(PEG)to study the seed dormancy and drought resistance of green *** results showed that newly harvested seeds exhibited dormancy,and treatments with HCl,NaOH and different water temperatures were unable to break the *** the seeds in GA could overcome dormancy,but the seeds failed to germinate when exposed to 25%PEG *** topramezone was applied at rates of 22.5 and 45.0 g a.i.·hm^(-2)at the 3-leaf and 5-leaf stages,respectively,the chlorophyll content reached the lowest value at 28 days after treatment(DAT).At the 7-leaf stage,the chlorophyll content reached the lowest value at 7 *** activity of 4-hydroxyphenylpy-ruvate dioxygenase(HPPD)enzyme after topramezone application reached the maximum value at 7 DAT for different leaf ages,and the higher the leaf age,the higher the HPPD activity,which was an important factor contributing to the resistance of green foxtail to topramezone.

关键词： green foxtail seed dormancy topramezone physiological response

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Glyphosate-Resistant Common Ragweed Control in Corn with Postemergence Herbicides

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Agricultural Sciences 2018年第6期9卷 670-675页

作者： Nader Soltani Lynette R. Brown Peter H. Sikkema University of Guelph Ridgetown Campus Ridgetown Canada

Four field trials were conducted on a farm infested with glyphosate-resistant (GR) common ragweed during 2016 and 2017 to evaluate various postemergence (POST) herbicides for the control of GR common ragweed in GR corn. Dicamba at 600 g·a.i.·ha-1, dicamba/diflufenzopyr at 200 g·a.i.·ha-1, dicamba/atrazine at 1500 g·a.i.·ha-1, topramezone + atrazine at 12.5 + 500 g·a.i.·ha-1, bromoxynil + atrazine at 280 + 1500 g·a.i.·ha-1, glufosinate at 500 g·a.i.·ha-1 and 2,4-D ester at 560 g·a.i.·ha-1 provided 58% to 85% control at 4 WAA and 49% to 88% control at 8 WAA. Other herbicides evaluated controlled GR common ragweed 9% to 41%. Common ragweed density was reduced 97%, 95%, 95% and 87% and shoot dry weight was reduced 93%, 95%, 94% and 90% with bromoxynil + atrazine, dicamba, glufosinate and topramezone + atrazine applied POST in GR corn, respectively. Results show that dicamba, bromoxynil + atrazine, topramezone + atrazine and glufosinate applied POST are the most efficacious herbicides among the herbicides evaluated for the control of GR common ragweed in GR corn.

关键词： Glyphosate-Resistance Atrazine Bromoxynil Dicamba Glufosinate topramezone Injury Yield

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