中国媒介生物学及控制杂志  2023, Vol. 34 Issue (6): 819-823

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邓思佳, 胡鞠萍, 朱国鼎
DENG Si-jia, HU Ju-ping, ZHU Guo-ding
真菌在蚊虫防控中的应用研究进展
Research progress of the application of fungi in mosquito control
中国媒介生物学及控制杂志, 2023, 34(6): 819-823
Chin J Vector Biol & Control, 2023, 34(6): 819-823
10.11853/j.issn.1003.8280.2023.06.021

文章历史

收稿日期: 2023-07-18
真菌在蚊虫防控中的应用研究进展
邓思佳1 , 胡鞠萍1 , 朱国鼎1,2     
1 国家卫生健康委员会寄生虫病预防和控制技术重点实验室, 江苏省寄生虫与媒介控制技术重点实验室, 江苏省血吸虫病防治研究所, 江苏 无锡 214064;
2 南京医科大学公共卫生学院, 江苏 南京 211166
摘要: 蚊虫是疟疾、登革热等传染病的重要传播媒介,对人类健康造成严重威胁。基于杀虫剂的化学防治是当前蚊媒疾病媒介控制的主要策略之一,但杀虫剂抗药性的威胁日益严重,迫切需要开发更多的蚊虫控制工具。昆虫病原真菌可作为化学杀虫剂的一种环保替代品,能够通过影响蚊虫的寿命和媒介能力等达到防控蚊虫和蚊媒传染病的目的,也能通过转基因技术对真菌进行改造间接发挥作用。该文对绿僵菌、白僵菌和大链壶菌等主要杀蚊真菌进行介绍,并对其在蚊虫防控中的研究进展进行综述和展望。
关键词: 真菌    蚊虫防控    绿僵菌    白僵菌    大链壶菌    
Research progress of the application of fungi in mosquito control
DENG Si-jia1 , HU Ju-ping1 , ZHU Guo-ding1,2     
1 National Health Commission Key Laboratory of Parasitic Disease Control and Prevention, Jiangsu Provincial Key Laboratory on Parasite and Vector Control Technology, Jiangsu Institute of Parasitic Diseases, Wuxi, Jiangsu 214064, China;
2 School of Public Health, Nanjing Medical University, Nanjing, Jiangsu 211166, China
Abstract: Mosquitoes are important vectors of infectious diseases such as malaria and dengue fever, posing a serious threat to human health. Insecticide-based chemical control is currently one of the main strategies for vector control of mosquito-borne diseases, but the growing threat of insecticide resistance has created an urgent need for the development of additional mosquito control tools. Entomopathogenic fungi can be used as an environmentally friendly alternative to chemical insecticides, because they can control mosquitoes and mosquito-borne infectious diseases by affecting the life span and vector ability of mosquitoes and play an indirect role by modifying fungi through transgenic technology. This review provides an introduction to the main mosquito-killing fungi, such as Metarhizium anisopliae, Beauveria bassiana, and Lagenidium giganteum, and summarizes the progress of their research in mosquito control.
Key words: Fungus    Mosquito control    Metarhizium anisopliae    Beauveria bassiana    Lagenidium giganteum    

蚊虫被认为是世界上最重要的病媒生物类群之一[1],是疟疾、登革热、基孔肯雅热、寨卡病毒病、西尼罗病毒病和黄热病等严重人类传染病的重要传播媒介[2-4]。由于大多数蚊媒传染病缺乏有效的疫苗,媒介控制仍然是预防蚊媒传染病的最有效途径之一[3]。蚊虫控制的方法主要包括化学防治、生物防治及物理防治等[1],其中基于杀虫剂的化学防治是目前防治蚊媒疾病的主要手段[5],但蚊虫产生的抗药性及其在环境中的副作用已被广泛关注[6-7],如环境污染以及对人类和非目标生物体的毒性等[8],因此需要开发可替代的、生态友好的、可持续的病媒控制工具[5]

近年来,研究者对昆虫病原真菌(entomopathogenic fungi)的认识不断加深,研究发现真菌可以通过毒素和真菌生长、抑制蚊虫的免疫系统等多种方式影响蚊虫的生长、繁殖和传播疾病的能力。同时真菌具备杀虫谱广和无化学污染等优点,因此,昆虫病原真菌是一种很有前途的控制蚊虫的生物控制工具[9],有较好的应用前景。

1 与蚊虫防控有关的真菌种类 1.1 白僵菌(Beauveria spp.)

白僵菌最早于19世纪由Agostino Bassi从家蚕(Bombyx mori)尸体中分离出来[10],是一种普遍存在于自然界土壤中的昆虫病原真菌[11],可产生各种能够引起外源性感染的毒素[12],导致昆虫死亡。其感染范围包括蚊幼虫和成虫及其他多种昆虫[13]:如埃及伊蚊(Aedes aegypti)成虫对白僵菌的易感性最早于20世纪60年代末被报道[14-15]。Lai等[16]通过RNA测序技术(RNA-Seq)对斯氏按蚊(Anopheles stephensi)感染球孢白僵菌(B. bassiana)后不同时间的基因表达谱进行了分析,更加深入地了解了昆虫病原真菌的感染策略,包括角质层降解和免疫逃逸等一系列过程。在实验室水平下,白僵菌的分生孢子(conidia)、芽生孢子(blastospores)及其次生代谢产物可以对蚊虫种群进行有效控制[11, 17]。目前白僵菌衍生的杀虫剂已作为有效的农业害虫控制手段在世界范围内注册并得到商业化开发[11, 18]

1.2 绿僵菌(Metarhizium spp.)

绿僵菌是一类种类高度丰富的真菌[19],因其对环境友好、易于批量生产等特点而得到广泛研究[20]。它们多数具有植物内生性和腐生性,能够与植物互惠互利,同时具备“解毒”本领,研究发现绿僵菌可将土壤和水体中剧毒的甲基汞等转化为低毒易降解的零价汞[21];绿僵菌也是一种天然杀蚊真菌,能通过感染蚊虫来控制和减少蚊虫的数量,从而降低蚊虫传播疾病的风险,可以在一定程度上减少或替代化学杀虫剂的使用[22]:Bart Knols团队证明雌性冈比亚按蚊(An. gambiae)感染绿僵菌后平均寿命与对照组相比缩短了4~6 d;同时该团队模拟若全年使用,疟疾被传播的程度将减少75%[23]。也有研究发现罗伯茨绿僵菌(M. robertsii)通过表观遗传KMT2-Cre1-Hyd4通路调控侵染结构附着胞分化形成和杀蚊毒力的分子机制[24],同时进一步发现ASH1-PEX16通路在调控附着胞膨压产生中起至关重要的作用[25]。因此绿僵菌在杀灭蚊虫方面具有良好的潜在价值。

1.3 大链壶菌(Lagenidium giganteum

大链壶菌(卵菌纲)是蚊虫的水生病原体,它产生的游动孢子可以附着并穿透幼蚊的角壁,然后在血腔中定植[26],随后菌丝消耗蚊虫营养直至完全取代蚊的组织,只留下角质层;蚊死后,菌丝产生含有游动孢子的无性实体结构,继续引发新的感染[13],也就是说,被大链壶菌感染并死亡的蚊虫仍然具有传染性。但是,大链壶菌不易感染某些按蚊如冈比亚按蚊[27],并且对环境敏感,温度和水中盐浓度会影响其杀虫效果[28-29]。一种以大链壶菌为基础的生物杀虫剂曾经在美国上市并广泛使用,但是因其对健康犬有害,已被停止售卖和使用[30-31]

1.4 贵阳腐霉(Pythium guiyangense

1994年苏晓庆[32]从花园土壤里分离并鉴定出一个新腐霉种,定名为贵阳腐霉。它的灭蚊方式和大链壶菌相似,均是向水中释放无性繁殖的游动孢子,主动寻找和入侵蚊虫[33]。该菌灭蚊谱广泛、易于培养、安全性高,具有一定的优势。但贵阳腐霉的毒力不稳定,菌种的保存方法还需进一步改善[34]。为解决其早期杀虫缓慢和效果不稳定的问题,苏晓庆[33]将苏云金芽孢杆菌以色列亚种(Bacillus thuringiensis israelensis,Bti)和贵阳腐霉按一定比例进行复配,设计了海藻酸钙微胶囊和菌丝体悬液2种新剂型用于蚊虫的生物防治。

2 真菌在蚊虫防控中的作用方式

绝大多数昆虫病原真菌属于绿僵菌属和白僵菌属[35-36],这些真菌在蚊虫生物防治和阻断病原传播上具有巨大优势。研究表明昆虫病原真菌可以有效地杀死成蚊和幼蚊[37-38],并且高毒力的绿僵菌会使雌蚊的繁殖力下降至近乎零[39],同时宿主和真菌之间也存在对营养物质的竞争[14],这些均会直接或间接地影响蚊虫的寿命。

2.1 真菌产物的毒性作用

与化学杀虫剂相比,昆虫病原真菌产生的毒素具有一定优势,它们在实验室或自然环境条件下均可以杀死蚊虫,对非目标生物体的毒性较低,并且其稳定性在极端寒冷或炎热的条件下依旧能维持数月[40-42]。Vivekanandhan等[42]实验表明绿僵菌的粗代谢产物对埃及伊蚊、斯氏按蚊和致倦库蚊(Culex pipiens quinquefasciatus)均有显著的毒性,经傅里叶红外光谱(Fourier transform infrared,FT-IR)分析发现其代谢物中存在酚类、生物胺类和羧酸类物质,可能参与了对蚊的毒性作用。同时有研究发现白僵菌-28菌丝提取物对致倦库蚊的幼虫和蛹均具有毒性,并且这些提取物特别是正十六烷酸会对蚊幼虫的中肠产生严重的组织损伤[11]

真菌的毒力和持久性以及分生孢子的生产力,可作为其开发为杀虫药剂的衡量标准[6, 43]。Lee等[1]利用从韩国分离的30株白僵菌对白纹伊蚊(Ae. albopictus)和淡色库蚊(Cx. pipiens pallens)的致病性和毒力进行了研究,确定了白僵菌CN6T1W2和JN5R1W1的毒力高于其他菌株,同时白僵菌JN5R1W1在培养基上的分生孢子产量高于CN6T1W2菌株。

2.2 分生孢子和芽生孢子的毒性作用

真菌在与蚊虫接触后,其孢子开始发育并入侵蚊虫体内,随后真菌繁殖并杀灭蚊虫,这一过程大概需要2周的时间[37]。这种具有感染力的孢子包括分生孢子和芽生孢子,分别在固体和液体基质上产生[35],前者形状均匀,12~20 d内在固体基质上产生疏水孢子;后者是薄壁、多形性的亲水孢子,在2~3 d内产生[44-45]

以绿僵菌为例,它可以直接穿透蚊虫的角质层,并不局限于经口感染宿主[46]。其感染过程主要包括黏附、萌发、附着胞形成、渗透、血淋巴定植和菌丝产孢6个阶段[20],其中分生孢子的黏附是决定其是否能成功侵染宿主的关键阶段[20, 47]:绿僵菌通过分生孢子感染埃及伊蚊卵后产生大量的新生分生孢子在后代中传播[48],同时分生孢子可对埃及伊蚊幼虫表现出杀虫活性,虽然无法附着在幼虫角质层表面,但是因为其容易被摄食,分生孢子表面的孢子结合蛋白酶Pr1能在蚊虫肠道中应激诱导宿主死亡[26, 44, 49],同时被摄入的分生孢子不发芽和定植血腔,仍然局限于肠腔[26]。芽生孢子与分生孢子略有不同,Paula等[35]研究表明芽生孢子在蚊虫生命周期的水生阶段比分生孢子更具毒性。

同时两者的作用也有相似之处。蚊虫经白僵菌分生孢子和芽生孢子处理后均可延缓幼虫向蛹的发育[50]。Shoukat等[51]实验结果表明经球孢白僵菌半数致死浓度(LC50)和亚致死浓度(LC20)处理后,白纹伊蚊的幼虫期和蛹期延长,雌、雄成虫的寿命缩短,并且显著地改变了F1代的生育能力。

除此之外,真菌孢子与其他化合物联用也能增强对蚊虫的杀虫效果。Paula等[52]研究结果表明绿僵菌与杀虫剂吡虫啉的结合能够增加对埃及伊蚊的毒力:与仅暴露于分生孢子的蚊虫相比,暴露于联合处理组的蚊虫在药物处理后6和12 h后的存活率显著降低。同时,在芽生孢子悬浮液中添加葵花籽油也可显著提高毒力的维持时间[35]。真菌与印楝油联合使用也可以有效地保持真菌的半衰期和毒力,使幼蚊存活率显著降低[53]。Bitencourt等[54]研究了绿僵菌、白僵菌和一种肖乳香属植物Schinus molle精油对埃及伊蚊幼虫的防治效果,结果表明绿僵菌和精油联用可对幼蚊产生较强的杀虫效果,而白僵菌与精油组合则杀虫效果不佳。

2.3 真菌对蚊虫免疫系统的抑制作用

研究发现真菌病原体与蚊虫中肠微生物群相互作用,造成菌群失调,影响中肠的免疫反应:通过下调中肠抗菌肽(antimicrobial peptide,AMP)和双氧化酶加速蚊的死亡[55]。如白僵菌可与蚊虫肠道微生物群相互作用导致黏质沙雷菌(Serratia marcescens)在中肠过度生长,并转移到血腔,从而加速蚊虫死亡[55]。蚊虫被病原体入侵后,免疫防御系统会发生黑化反应,其中酚氧化酶(POs)是催化黑色素形成的关键酶。有研究表明埃及伊蚊的抗真菌反应与PO3有关[56]。白僵菌与肠道和血细胞相互作用会影响埃及伊蚊的免疫[9]。Bitencourt等[9]证明埃及伊蚊被白僵菌CG 206分离株感染24 h后,总血细胞浓度降低且幼蚊中抗菌肽的表达下调但酚氧化酶活性未改变,使幼蚊免疫反应降低,更易被真菌感染。此外,白僵菌可在蚊细胞中输出一种类似微小RNA的物质(bba-milR1),并与Argonaute 1(AGO1)结合来控制宿主的RNA干扰机制,可减弱宿主免疫并促进其感染[57]:bba-milR1在真菌穿透蚊虫表皮的过程中高表达,并通过沉默蚊虫Toll受体的配体Spätzle 4(Spz4)表达抑制宿主免疫功能。

3 转基因真菌在蚊虫防控中的应用

天然绿僵菌菌株通常对蚊虫的影响为1~2周可达到90%以上的死亡率,但是由于其缓慢的杀伤速度和不可预测的效力使其不能作为独立的蚊虫控制剂[58],例如当疟原虫进入蚊虫体内直至宿主获得传播疟疾的能力通常需要10~14 d的时间。而真菌孢子需要一定时间才能通过表皮感染蚊虫并将其杀灭[59],所以如果其感染真菌过晚,它仍有在死亡前传播疟疾的机会。因此需要一定的技术手段来改进和完善真菌的毒力作用。Fang等[60]利用基因工程技术使金龟子绿僵菌(M. anisopliae)表达中肠肽1(SM1)和一种抗菌毒素(scorpine)来阻止疟原虫子孢子附着蚊的唾液腺,在发挥绿僵菌生物杀虫剂作用的同时,减少了感染晚期的蚊虫传播疾病的风险。因此基因工程真菌可成为提高生物防治效果的有力工具[61]

转基因技术可以使真菌仅需要很少的孢子就能引起蚊虫致命的感染,来自马里兰大学等团队的研究人员在平沙绿僵菌(M. pingshaense)的菌株中注射了一种来自蜘蛛毒液的毒素基因,当它接触蚊血淋巴时就会启动,在实验室条件下,它可以更快地杀死蚊虫,并且仅1~2个孢子就可以使蚊致死[62]。与上述结果相似的还有Lovett等[61]设计的Mp-Hybrid菌株,在1个启动子控制下表达钙离子/钾离子阻断剂,Mp-Hybrid真菌不仅杀死蚊速度更快,所需孢子剂量更低,而且与杀虫剂一起使用时可以最大限度地发挥药效并控制耐药性真菌。真菌经基因改造后增加毒力的同时还能抑制蚊虫的免疫反应,Cui等[3]成功构建出表达伊蚊免疫抑制性微小RNA(miRNAs)的白僵菌,证明了工程白僵菌菌株能够在感染蚊虫过程中产生大量miRNAs(miR-8和miR-375)并将其跨界转运到宿主细胞内,并通过靶向多个宿主基因抑制蚊虫免疫反应,从而显著提高真菌对埃及伊蚊的毒力。这种基于病原体介导的RNAi(pathogen-medeiated RNAi,pmRNAi)方法为提高真菌杀虫剂的杀伤效果提供了一种创新策略。同时有研究表明白僵菌还可通过基因改造表达苏云金芽孢杆菌毒素Cyt2Ba,与野生型菌株相比显著降低了白纹伊蚊的存活率和繁殖力,提高了白僵菌杀灭蚊虫的效果[63]

与转基因蚊虫本身相比,转基因真菌的方式更加简便快速且灵活[58],并且转基因菌株比转基因序列更容易引入蚊种群[64],因此转基因菌株在未来的蚊虫防控方面可能更具潜力。

4 总结与展望

在过去十几年间,真菌在蚊虫防控方面取得了很大的进展,利用昆虫病原真菌不仅可以减少蚊虫的数量,还可以降低传播虫媒病毒和其他病原体的媒介能力[16, 65],展现出了较大的应用潜力。有研究表明白僵菌感染蚊虫后可通过激活蚊的Toll受体和酪氨酸激酶/信号转导子及转录激活子(Janus kinase/signal transducers and activators of transcription,JAK-STAT)免疫信号通路控制的效应基因,间接介导蚊虫的抗登革病毒效应[66]。白僵菌还可使含有卵巢肿瘤(OTU)结构域的蛋白酶OTU7B与蛋白TRAF4相互作用来抑制埃及伊蚊的免疫信号传导,从而使其对白僵菌的感染更加敏感[67]。Garza-Hernández等[14]通过研究暴露于绿僵菌并以混有登革Ⅱ型病毒(DENV-2)血液为食的埃及伊蚊,发现被混合感染的蚊致死率为78%,并且在存活蚊虫中,能够传播DENV-2的蚊虫数量相较于单独感染DENV-2的蚊虫数量减少了5倍,说明绿僵菌的感染能够降低埃及伊蚊对DENV-2的媒介传播能力。

尽管如此,真菌的开发和利用还存在一些限制,一是单独使用天然真菌对于蚊虫杀灭的起效时间较长,毒力作用不强;二是可用于杀灭蚊虫的真菌种类较少;三是蚊虫自身也会抵御真菌的感染。因此未来需要探索更多更具杀虫效果的真菌菌株,并进一步研究和改进真菌的性能,如采用真菌与化学杀虫剂联合使用等手段,提高真菌杀虫效果,同时可以探索如何增强真菌的适应性和生存能力,例如通过改变其生长环境和生长条件,以提高其在应用到野外环境时的生存能力和杀虫效果等。此外,在研究天然真菌的基础之上更多地进行转基因技术的研究以获得符合需求的杀蚊真菌。总之,真菌在蚊虫防控方面的应用潜力较大。需要通过不断地研究和探索,开发出更安全、高效的杀蚊真菌和使用方法,为蚊传疾病防控新技术的研发和应用提供科学思路。

利益冲突  无

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