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麦蚜对拟除虫菊酯类杀虫剂抗性研究进展

2021-03-12龚培盼李新安王超李祥瑞张云慧李建洪朱勋

植物保护 2021年1期
关键词:抗药性

龚培盼 李新安 王超 李祥瑞 张云慧 李建洪 朱勋

摘要 :麦蚜是为害小麦的一类重要害虫,广泛分布于我国各小麦种植区。2016年-2018年我国麦蚜总体偏重发生,严重影响小麦产量和品质,造成巨大的经济损失。拟除虫菊酯类杀虫剂是防治麦蚜的主要杀虫剂类型之一,但由于化学农药的长期使用,麦蚜对拟除虫菊酯类杀虫剂产生了不同程度的抗性。本文综述了拟除虫菊酯类杀虫剂作用机制、麦蚜对拟除虫菊酯类杀虫剂的抗性现状以及近年来拟除虫菊酯类杀虫剂抗性机制研究的主要进展。

关键词 :麦蚜; 拟除虫菊酯杀虫剂; 抗药性

中图分类号: S 481.4

文献标识码: A

DOI: 10.16688/j.zwbh.2019543

Research advances in pyrethroid insecticide resistance in wheat aphids

GONG Peipan1,2, LI Xinan2, WANG Chao2, LI Xiangrui2, ZHANG Yunhui2, LI Jianhong1*, ZHU Xun2*

(1. Hubei Key Laboratory of Utilization of Insect Resources and Sustainable Pest Management, College of

Plant Science & Technology, Huazhong Agricultural University, Wuhan 430070, China;

2. State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of

Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193, China)

Abstract :Wheat aphids are a group of important pests that infect wheat cereal and are widely distributed in China. The overall occurrence of wheat aphids in China in 2016-2018 has seriously affected wheat yield and quality, causing huge economic losses. Pyrethroid insecticides are among the main types of insecticides for controlling the wheat aphid. However, due to the longterm use of chemical insecticides, wheat aphids have developed varying degrees of resistance to pyrethroid insecticides. This article reviewed the mechanisms of action of pyrethroid insecticides, the current status of resistance of wheat aphids to pyrethroid insecticides, and the main advances in the research of pyrethroid insecticide resistance mechanisms in recent years.

Key words :wheat aphids; pyrethroid insecticides; pesticide resistance

小麥在世界各地广泛种植,是我国主要的粮食作物之一,年播种面积仅次于水稻和玉米。小麦蚜虫是小麦上的重要害虫之一,在我国为害小麦的蚜虫种类主要有麦长管蚜Sitobion miscanthi (Fabricius)、禾谷缢管蚜 Rhopalosiphum padi (Linnaeus)、麦二叉蚜Schizaphis graminum (Rondani) 和麦无网长管蚜 Metopolophium dirhodum (Walker)。麦蚜属于半翅目 Hemiptera 蚜科 Aphididae,以成蚜、若蚜吸食小麦叶、茎、嫩穗的汁液引起植株营养恶化,造成小麦籽粒饥瘦或不能结实,排泄的蜜露覆盖在叶片表面,影响呼吸和光合作用。此外,麦蚜也是传播植物病毒的重要昆虫媒介,造成小麦黄矮病[1]。近年来由于全球气候变暖,北方地区冬季温暖少雨,年后气温回升快等气候条件,麦蚜呈现出虫害发生提前、为害期长、峰期蚜量大等特点,严重影响小麦品质和产量,造成巨大损失[2]。目前生产上对麦蚜的防治仍以化学防治为主,而化学防治引起的抗药性问题是导致防效降低,甚至防治失败的重要原因。麦蚜对各类常用杀虫剂的抗性报道也越来越多[34]。

1 拟除虫菊酯杀虫剂

拟除虫菊酯类杀虫剂是从天然除虫菊素衍生而来的一类化学农药。天然除虫菊素包括除虫菊素Ⅰ(pyrethrins Ⅰ)、除虫菊素Ⅱ(pyrethrins Ⅱ)、瓜叶除虫菊素Ⅰ(cinerin Ⅰ)、瓜叶除虫菊素Ⅱ(cinerin Ⅱ)、茉酮除虫菊素Ⅰ(jasmolin Ⅰ)和茉酮除虫菊素Ⅱ(jasmolin Ⅱ)6种结构相似的化合物,它们的共同特征是具有酯的结构。除了除虫菊素Ⅰ外的其他5种除虫菊素对蚊、蝇有很高的杀虫活性,其中除虫菊素Ⅱ有较快的击倒作用。化学家们在保持除虫菊素基本骨架的基础上,通过改变和简化菊酸部分的结构,先后仿制合成了一系列除虫菊素衍生物——拟除虫菊酯杀虫剂。和除虫菊素相比,拟除虫菊酯类化合物具有更高的光稳定性和杀虫效力。根据结构中是否含有氰基以及对昆虫产生毒性作用的特点,拟除虫菊酯杀虫剂可分为Ⅰ型和Ⅱ型两类[5]。Ⅰ型拟除虫菊酯杀虫剂不含α氰基,包括联苯菊酯、氯菊酯、胺菊酯等;Ⅱ型拟除虫菊酯杀虫剂含有α氰基,包括氰戊菊酯、甲氰菊酯、氟氰戊菊酯和溴氰菊酯等,拟除虫菊酯类杀虫剂自应用以来在全球杀虫剂市场中一直占据着重要位置。新烟碱类杀虫剂销售额在杀虫剂中占比18.0%~21.8%长期位居第一[6],然而有研究表明暴露于亚致死浓度新烟碱杀虫剂中会导致非靶标生物如蜜蜂的神经疾病[7],部分地区新烟碱类杀虫剂被禁限使用,为拟除虫菊酯类杀虫剂提供了机遇。

有研究发现VGSC并不是拟除虫菊酯类杀虫剂的唯一作用靶标。棉铃虫神经细胞上存在大电导钙激活钾通道(large conductance calciumactivated potassium channels, BKCa),藏媛媛等通过全细胞膜片钳技术首次记录了棉铃虫中枢神经细胞BKCa通道的电流,并分析了七氟菊酯和溴氰菊酯对BKCa通道的影响,结果发现棉铃虫神经细胞膜上表达BKCa通道,而七氟菊酯和溴氰菊酯均能显著抑制BKCa通道的峰值电流,使BKCa通道激活的电压依赖性发生改变,证实该通道是七氟菊酯和溴氰菊酯的作用靶标[57]。

4 麦蚜对拟除虫菊酯类杀虫剂的抗性机制

关于麦蚜对拟除虫菊酯类杀虫剂抗性机制的研究在现阶段并不多,这可能与目前麦蚜对拟除虫菊酯类杀虫剂仍处于敏感和低水平抗性有关。左亚运进行禾谷缢管蚜抗高效氯氰菊酯品系的筛选,筛选至20代,抗性系数增长为9.89。比较禾谷缢管蚜抗性品系和敏感品系羧酸酯酶和多功能氧化酶O脱甲基酶的活性,发现抗性品系的羧酸酯酶比活力是敏感品系的1.63倍;抗性品系的多功能氧化酶O脱甲基酶比活力是敏感品系的1.90倍,并在抗性监测中发现河南南陽禾谷缢管蚜田间种群中存在M918L突变[58]。Foster等[55]在麦长管蚜中检测到钠离子通道突变位点L1014F的存在,并证实该突变与麦长管蚜对高效氯氟氰菊酯的抗性相关。虽然麦蚜对拟除虫菊酯杀虫剂的抗性不像家蝇、淡色库蚊和埃及伊蚊等媒介昆虫那样严重,但仍存在抗性风险,麦蚜对拟除虫菊酯类杀虫剂抗性机制的研究仍处于与解毒酶活性相关的生理生化水平。

目前,棉蚜和桃蚜已经对拟除虫菊酯产生了较高的抗性,综合已有文献报道可知麦蚜存在对拟除虫菊酯类杀虫剂产生抗性突变的风险。抗性监测是了解害虫田间种群对杀虫剂敏感性最直接有效的方法。褐飞虱、棉蚜和桃蚜等很多重要害虫的抗药性监测工作也一直在开展,这些都为麦蚜抗性监测工作的开展和抗性机理的研究提供了宝贵的借鉴经验。通过抗性监测了解麦蚜田间种群对拟除虫菊酯类杀虫剂的抗性水平和相关解毒酶活性水平的变化情况,从中发掘出与拟除虫菊酯类杀虫剂抗性相关的解毒酶系及相关基因;对于田间发现的高抗种群,通过建立一定数量的单雌系品系进一步筛选出纯合的高抗品系,测定其解毒酶活性水平,并对已在其他害虫中报道的钠离子突变位点进行检测,同时可以利用转录组测序技术分析敏感品系和抗性品系的基因表达情况等。这些工作对于田间麦蚜化学防治用药策略的调整具有重要的指导作用,对于延缓麦蚜对拟除虫菊酯类杀虫剂抗性发展速率和开展麦蚜抗药性机制的研究具有重要意义。

5 展望

麦蚜种类多、分布广泛、生殖方式多样、生活史相对复杂并且具有迁飞性,这使得麦蚜的防治和抗药性研究变得比较困难。麦蚜抗性问题日趋严重,拟除虫菊酯类杀虫剂作为防治麦蚜的一类主要杀虫剂,研究明确其产生抗药性的机制对于丰富麦蚜的防治手段、提高防治效果、延缓麦蚜抗药性的发展和延长拟除虫菊酯类杀虫剂的使用寿命具有积极意义。

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