Crop Protection Division, Central Institute for Cotton Research, Nagpur, India.
Technical Information Section, International Cotton Advisory Committee, Washington, DC, USA.
Pest Manag Sci. 2018 Nov;74(11):2544-2554. doi: 10.1002/ps.5038. Epub 2018 Jun 9.
Pink bollworm (PBW) adaptation to transgenic Bacillus thuringiensis (Bt) cotton expressing crystal 1Ac (Cry1Ac) (Bt-I) and Cry1Ac + Cry2Ab (Bt-II) was assessed in India during 2010-2017 in 38 districts of the 10 major cotton-growing states.
PBW larval incidence on Bt cotton was nil in northern India, wherein the resistance ratios (RRs) to Cry1Ac were 26-262 and those to Cry2Ab were 1-108. In central and southern India, the annual average PBW larval recovery from Bt II cotton was high at 28.85-72.49% during 2014-2017. In central and southern India, the 50% lethal concentration (LC ) of Cry1Ac increased from a mean of 0.330 µg mL (range 0.126-0.849 µg mL ) in 2013 to a mean of 6.938 µg mL (range 3.52 to 10.30 µg mL ) in 2017 and the RR increased from a mean of 47.12 (range 18-121) in 2013 to a mean of 1387 (704-2060) in 2017, whereas the LC value for Cry2Ab increased from a mean of 0.014 µg mL (range 0.004-0.094 µg mL ) in 2013 to a mean of 12.51 µg mL (range 3.92 to 28.10 µg mL ) in 2017 and the RR increased from a mean of 5.4 (range 1-31) in 2013 to a mean of 4196 (1306-9366) in 2017.
High PBW larval recovery on Bt-II in conjunction with high LC values for Cry1Ac and Cry2Ab in major cotton-growing districts of central and southern India provides evidence of field-evolved resistance in PBW to Bt-I and Bt-II cotton. © 2018 Society of Chemical Industry.
2010-2017 年，在印度 10 个主要棉花种植邦的 38 个地区，评估了粉红棉铃虫（PBW）对转 Bt 棉花的适应情况，该棉花表达的晶体 1Ac（Cry1Ac）（Bt-I）和 Cry1Ac+Cry2Ab（Bt-II）。
印度北部地区 PBW 幼虫在 Bt 棉上的发生率为零，Cry1Ac 的抗性比（RR）为 26-262，Cry2Ab 的 RR 为 1-108。在印度中部和南部，2014-2017 年，Bt-II 棉花上 PBW 幼虫的年平均恢复率高达 28.85-72.49%。在印度中部和南部，Cry1Ac 的 50%致死浓度（LC）从 2013 年的 0.330μg/ml（范围为 0.126-0.849μg/ml）均值增加到 2017 年的 6.938μg/ml（范围为 3.52 至 10.30μg/ml），RR 从 2013 年的 47.12（范围为 18-121）均值增加到 2017 年的 1387（704-2060），而 Cry2Ab 的 LC 值从 2013 年的 0.014μg/ml（范围为 0.004-0.094μg/ml）均值增加到 2017 年的 12.51μg/ml（范围为 3.92 至 28.10μg/ml），RR 从 2013 年的 5.4（范围为 1-31）均值增加到 2017 年的 4196（1306-9366）。
印度中部和南部主要棉花种植区 Bt-II 上 PBW 幼虫大量发生，同时 Cry1Ac 和 Cry2Ab 的 LC 值较高，表明 PBW 对 Bt-I 和 Bt-II 棉花产生了田间抗性。© 2018 化学工业协会。
