【摘要】 采用琼脂法测定了长江三角洲地区宁绍平原和杭嘉湖平原5个稻区(宁波、绍兴、杭州、嘉兴和湖州)稻田耳叶水苋Ammannia arenaria不同生物型对苄嘧磺隆的抗性水平。结果表明,所采集的88种耳叶水苋生物型中,有96.6%已对苄嘧磺隆产生了抗性,其中,低抗(3<抗性指数RI≤10)、中抗(10<RI≤50)和高抗(RI>50)的生物型分别占总数的22.7%、53.4%和20.5%。宁波NB0143-01和绍兴SX077生物型对苄嘧磺隆的RI值分别高达124.4和120.4。5个稻区中,绍兴地区耳叶水苋的抗性水平最高,平均RI值为53.1;宁波次之,平均RI值为35.1;湖州、杭州和嘉兴地区的抗性水平相对较低,平均RI值分别为24.1、19.9和18.7。表明稻田耳叶水苋对苄嘧磺隆的抗性程度较高,且在宁绍平原和杭嘉湖平原稻区已普遍出现抗性。其中在宁绍平原苄嘧磺隆对耳叶水苋的选择压较大,长期连续用药可能是该地区抗性水平高于其他区域的重要原因。这是有关耳叶水苋对苄嘧磺隆抗性种群分布的首次报道。更多还原

【Abstract】 The resistant levels of different biotypes of Ammannia arenaria collected from Ningshao plain and Hangjiahu plain within the Yangtze River Delta region to bensulfuron-methyl(BSM) was investigated by agar method.For the 88 biotypes tested,96.6% of them were resistant to BSM,of which the percentage of low resistance(3<Resistance index,RI≤10),middle resistance(10<RI≤50) and high resistance(RI>50) were 22.7%,53.4% and 20.5%,respectively.The RI of biotype NB0143-01(from Ningbo) and SX077(from Shaoxing) were as high as 124.4 and 120.4,respectively.Among five regions of Ningbo,Shaoxing,Hangzhou,Jiaxing and Huzhou cities for seeds collection,the biotypes from Shaoxing were the most resistant to BSM with the average RI of 53.1,the biotypes from Ningbo took second place with the average RI of 35.1,and those from Huzhou,Hangzhou and Jiaxing were relatively less resistant to BSM,with the average RI of 24.1,19.9 and 18.7,respectively.The results indicated that the resistant level of A.arenaria to BSM was really high,and the resistance generally occurred in paddy rice growing area of Ningshao plain and Hangjiahu plain.The reason of the higher resistance level of the weed to BSM in Ningshao plain was probably related to the higher selection pressure and continuous use of this herbicide for long time.It’s the first report for the distribution of resistant populations of A.arenaria to BSM.更多还原