苹果与胶孢炭疽菌互作研究进展

冀志蕊1,2,王美玉2,张树武1,杜宜南2,丛佳林2,徐秉良1*,周宗山2*

1甘肃农业大学植物保护学院,兰州 730070;2中国农业科学院果树研究所,辽宁兴城 125100)

摘 要:胶孢炭疽菌(Colletotrichum gloeosporioides)能够引发苹果苦腐病和苹果炭疽叶枯病,危害叶片和果实,影响果品产量和品质,给苹果产业造成严重的经济损失。对苹果与病原物互作分子机制最新研究进展进行综述,包括苹果上炭疽病的病原菌组成和分类、侵染循环及其引发的果树病害种类,病原菌的致病结构和降解酶类、致病相关基因的挖掘与分析、效应蛋白的筛选与功能分析等致病相关分子机制,苹果被侵染后生理生化变化、激素信号、抗病基因挖掘、miRNA参与的免疫调控机制等抗病相关的研究内容,以期为解析病原菌致病机制及与寄主互作机制,进而为挖掘潜力候选基因,以及病害综合防控和抗病分子育种奠定理论基础。

关键词: 苹果;胶孢炭疽菌;侵染机制;抗病机制

炭疽菌(Colletotrichum)属小丛壳科刺盘孢属真菌,有性型为子囊菌门盘菌亚门小丛壳属,在温暖和潮湿的条件下易暴发流行,是世界上重要的植物病原菌之一[1]。炭疽菌可分为14 个复合种和部分种,胶胞炭疽菌(C. gloeosporioides)是重要的一个复合种,能侵染1000 余种作物,危害枝干、叶部、果实等部位,造成果实腐烂、植株枯萎甚至死亡。

C.gloeosporioides 通过“半活体营养”寄生并侵染寄主植物[2],在整个侵染周期主要有活体营养型(biotrophic)和死体营养型(necrotrophic)两种营养模式。在侵染初期活体营养阶段,菌体不会立即杀死周边寄主细胞,而是感应寄主表面的物理和化学信号(植物表面硬度、疏水性、叶片纹理、植物激素等),产生初侵染菌丝摄取寄主体内营养和能源。在侵染后期,分化出次生菌丝并迅速扩展,分泌细胞壁降解酶导致植物组织形成坏死斑,后转换为死体营养[3-5],其生活史和侵染过程如图1 所示。

图1 胶孢炭疽菌生活史及其侵染过程示意图
Fig.1 Schematic diagram of the disease cycle and infection process of C.gloeosporioides

目前,生产上对炭疽病的防控以化学农药为主,随着人们对果品安全的逐渐重视,科研人员开展了药剂筛选和复配[6]、农药助剂应用[7]及植物免疫诱抗剂使用等[8]药剂减量增效研究。尽管对苹果炭疽病菌的侵染和致病研究取得一定进展,但因其种群多样、侵染过程复杂,对其侵染致病机制和果树抗性机制的研究仍有待深入。笔者在本文中将围绕苹果胶孢炭疽菌病原学、病原菌致病机制及果树抗性机制展开论述。

1 侵染苹果的胶孢炭疽菌复合群概述

胶孢炭疽菌(C. gloeosporioides)能够引发苹果果实炭疽病(apple bitter rot)和苹果炭疽叶枯病(Glomerella leaf spot of apple,GLSA),也能引发果实采后炭疽病。胶孢炭疽菌复合种(C. gloeosporioides complex)是苹果上主要的病原菌,包含果生刺盘孢(C.fructicola)、隐秘刺盘孢(C.aenigma)、胶孢刺盘孢(C. gloeosporioides)等13 种不同炭疽菌,其中C. fructicolaC. gloeosporioides 是多种果树的重要致病菌,可以在无伤条件下成功侵染寄主[9-10]。除苹果外,C. gloeosporioides 还可引发樱桃、百香果、猕猴桃等果树病害[10-15](表1)。

表1 近5 年来有关胶孢炭疽菌侵染果树的报道
Table 1 Report on the infection of fruit trees by C.gloeosporioides in the past 5 years

病原菌Name of fungi果生刺盘孢C.fructicola参考文献References[16-19]隐秘刺盘孢C.aenigma暹罗刺盘孢C.siamense胶孢刺盘孢C.gloeosporioides异国刺盘孢C.alienum亚洲刺盘孢C.asianum寄主Host蛋黄果、樱桃、软枣猕猴桃、石榴、百香果Pouteria campechiana (Kunth) Baehni, Prunus avium, Actinidia arguta,Punica granatum L.,Passiflora edulis苹果Malus domestica木瓜、苹果Carica papaya L.,M.domestica葡萄Vitis vinifera L.杧果Mangifera indica L.苹果M.domestica[20][21][22][23][24]

2 胶孢炭疽菌致病分子机制

随着生物信息学和分子生物学的发展,胶孢刺盘孢(C.gloeosporioides)、希金斯刺盘孢(C.higginsianum)、禾生刺盘孢(C. graminicola)、东方刺盘孢(C. orbiculare)等全基因组测序组装完成并公布。在此基础上,PEG介导的遗传转化[25]和农杆菌介导的转化[26]在苹果炭疽菌研究中成功应用,为病原菌致病分子机制的解析提供了理论依据[22-23]。近年来苹果上胶孢炭疽菌致病分子机制的研究主要集中在致病结构和降解酶测定、致病基因的克隆与分析、效应蛋白筛选与功能研究及炭疽菌毒素等方面(图2)[27-29]

图2 苹果中已报道的胶孢炭疽菌致病相关基因
Fig.2 Pathogenic genes related to C.gloeosporioides in apple trees

2.1 胶孢炭疽菌致病结构和降解酶

炭疽菌要穿透寄主的表皮组织,需要对寄主组织施加机械压力,即孢子萌发时形成的附着胞及其胞内组合液产生膨压,压力施加至附着胞下部的侵染钉,当压力到达一定程度时直接穿透植物表皮而侵入,构成侵染和定殖[30]。黑化附着胞的形成可能涉及一系列复杂的生物学过程,包括分泌特定的分子、改变细胞壁结构以提供附着支持等[31]

植物的细胞壁是抵御病原菌侵入的天然屏障,病原菌通过分泌产生果胶酶、角质酶、纤维素酶、蛋白酶等降解酶类物质破坏寄主细胞壁,辅助其侵染和定殖。薛莲[32]对苹果采后炭疽病菌细胞壁降解酶活性进行分析,明确聚甲基半乳糖醛酸酶(PMG)和羧甲基纤维素酶(Cx)在病原菌侵染中发挥重要作用。研究表明,衔接蛋白GcAP1 复合体分布于细胞质中,GcAP1 基因能够调控多聚半乳糖醛酸内切酶基因(CgPG1CgPG2)、果胶裂解酶基因(pnl-1pnl-2)及果胶酸酯裂解酶基因(pelApelB)的表达,从而影响炭疽菌的生长发育和毒力[33]。研究表明,胶孢炭疽菌pH依赖性转录因子CgPacC能够调节细胞壁降解酶、转运蛋白和抗氧化剂的表达,在病原菌定殖中发挥重要作用[34]

2.2 胶孢炭疽菌侵染阶段相关致病基因挖掘与分析

C.gloeosporioides 成功侵染定殖包括分生孢子萌发、附着胞形成、黑色素生成、侵染钉穿透寄主组织等不同阶段,涉及的基因及其调控机制较为复杂,目前的研究以单一基因为主。

Zhao 等[35]证实苹果炭疽叶枯病菌染色质调节基因CgSET5 在菌丝生长、分生孢子形成、附着胞形成、细胞壁完整性、致病性中发挥重要作用,并同时参与过氧化物酶体的生物反应,是C. gloeosporioides 的核心致病调节因子。该团队在后续研究中证实单羧酸转运蛋白CgMCT1 参与了C.gloeosporioides营养生长、黑色素形成、分生孢子形成,且参与寄主体内ROS降解[27]。Zhou等[28]发现当炭疽菌CgABCF2 基因缺失后,菌丝生长速率和附着胞数量显著下降,导致致病性丧失。张俊祥等[36-37]研究证实CgCMK1CgNVF1 在炭疽菌分生孢子和附着胞中的表达,对分生孢子产量、附着胞形成、氧化胁迫应答反应及致病性等方面均有影响。徐杰[38]证实苹果炭疽叶枯病菌基因GTPBP1在调控附着胞的形成中发挥作用。谭清群[39]研究证实氨甲酰磷酸合成酶(carbamyl phosphate synthase,CPS)小亚基基因Cpa1 通过调控精氨酸的合成从而影响病原菌致病力。研究表明,寡肽转运蛋白基因CgOpt1在菌丝中表达,参与真菌对IAA反应的调节,通过影响产孢和色素沉积来降低病菌的致病性[40]。甾醇糖基转移酶编码基因CgChip6参与分生孢子萌发和附着胞的形成,该基因缺失后病原菌毒力显著下降[41]。Liang等[42]对果生炭疽菌(C.fructicola)1104-7 基因组进行了测序和组装,获得了高质量参考基因组,为C.fructicola致病相关基因的研究提供了重要的理论和数据支撑。

2.3 转录因子调控胶孢炭疽菌分子机制

转录因子(transcription factor,TF)能够与基因启动子区域的顺式作用元件进行特异性互作,从而调控目的基因的表达强度,可分为4 类,即锌指蛋白(包括3 类:C2H2、C4 和C6)、碱性亮氨酸拉链、碱性螺旋环螺旋和同源异形盒类转录因子[43]。已有研究表明,胶孢炭疽菌的转录因子在表达调控中能起到协调作用,能够促进附着胞黑化和定殖。C2H2锌指蛋白型转录因子CgAzf1、CgCrzA 及CgGcp1 能够调控黑色素生物合成途径相关基因的表达,参与分生孢子的萌发和侵染过程[31,44-45]。CfSte12 能够调控与附着胞功能相关的四次穿模蛋白PLS1(tetraspanin PLS1)、Gas1 样蛋白(Gas1-like proteins)、角质酶和黑色素合成的基因表达[46]。阳离子胁迫反应转录因子CgSltA、CgCrzA 及CsHtf1 在炭疽菌营养生长、分生孢子产生、附着胞形成和致病性等方面均发挥重要作用[45,47]。碱性亮氨酸拉链(basic leucine zipper,bZIP)转录因子CgAP1 在C. gloeosporioides 中起氧化还原传感器的作用[48-49]。转录因子CfMcm1 是C.fructicola的关键调节因子,在病原菌无性繁殖、黑色素形成、致病性、果胶酶降解等过程中发挥作用[50]

2.4 效应蛋白筛选及功能研究

在侵染过程中,炭疽菌通过分泌一系列效应蛋白抑制寄主免疫反应,从而促进病原菌的侵染和定殖[51-52],不同侵染阶段所分泌的效应因子功能不同[3,53]。随着基因组测序的应用,炭疽菌中多个候选的效应因子被成功筛选鉴定[54-55]。真菌胞外膜蛋白CFEM(common in several fungal extracellular membrane)是真菌所独有的蛋白结构域,与病原菌致病性密切相关。Shang 等[56]研究证实,刺盘孢属真菌CFEM 型效应因子CfEC12 能够与苹果中MdNIMIN2互作,与水杨酸受体NPR1竞争MdNIMIN2蛋白的结合位点,从而抑制苹果抗性基因的表达和免疫反应。LysM 型效应蛋白可以保护真菌细胞壁免受植物几丁质酶的作用或隔离释放的壳寡糖,从而避免被植物的防御系统识别,其具有几丁质结合活性,可以结合几丁质从而抑制植物的PTI(patterntriggered immunity),促进病原菌的侵染[57]。Shang等[58]研究证实C.fructicola 中效应蛋白CfEC92 在早期附着胞生成和附着胞介导的渗透阶段上调表达,抑制苹果的PTI 和相关防御基因表达,促进病原菌侵染。王美玉[59]开展效应蛋白Sntf2 功能研究,证实其能够与叶绿体组装因子Mdycf39 互作干扰叶绿体功能,从而抑制寄主植物的免疫反应,促进C.gloeosporioides的侵染和定殖。

2.5 胶孢炭疽菌毒素

炭疽菌在死体营养阶段通过分泌毒素造成寄主组织坏死。目前,对于炭疽菌毒素的研究多集中在毒素生物学测定、成分鉴定纯化阶段。C.gloeosporioides 产生的毒素为非寄主专化性毒素,能够侵染多种寄主。Khodadadi 等[60]分离鉴定了苹果苦腐病病原菌,明确其毒素能够对3种不同树种造成危害,关于炭疽菌的毒素和作用机制仍然有待进一步深入研究。

3 苹果抗胶胞炭疽菌侵染的分子机制

果树在自然环境中会受到各类病原物的侵染,为了抵御病原菌的侵染,植物进化出识别和抵御病原菌的PTI 和ETI 两层免疫系统[61]。第一层免疫系统是由植物细胞质膜上的模式识别受体感知微生物相关分子模式(microbe-associated molecular pattern,MAMPs)或损伤相关分子模式(damage-associated molecular pattern,DAMPs)而触发一系列的免疫反应,称为“模式触发免疫”(PTI),该免疫反应包括活性氧(reactive oxygen species,ROS)的激活及抗病基因表达量上调等[62-63]。病原菌为了应对植物的PTI免疫反应进化出毒力蛋白(效应因子),抑制植物PTI反应,从而成功侵入,这一中间过程被称为“效应因子触发的易感性”,即EST(effector-triggered susceptibility)。最后,植物进化出识别和抵御这些效应子的胞内NLR 来诱导更为强大的抗性反应,即第二层免疫“效应因子触发的免疫”,ETI(effector-triggered immunnity)[64-65]。ETI的免疫反应主要包括程序性细胞死亡的过敏性反应(hypersensitive responses,HR)、Ca2+内流、胼胝质的沉积等。植物在PTI和ETI期间,产生的免疫反应幅度和时间有所不同,但所触发的免疫信号网络和下游反应有所重叠[66-68]

苹果抗炭疽病的研究起步相对较晚,主要开展了种质资源鉴定[69]、生理生化检测、抗病基因挖掘、植物激素介导的抗病反应及抗病相关转录因子[70]作用机制等研究。

3.1 生理生化变化

研究表明接种炭疽菌后,嘎拉和富士叶片内超氧化物歧化酶(superoxide dismutase,SOD)、多酚氧化酶(polyphenoloxidas,PPO)、过氧化物酶(peroxidase,POD)、过氧化氢酶(catalase,CAT)、5-羟色胺-N-乙酰基转移酶(SNAT)的活性增强,其相关基因表达量呈先升后降的趋势,表明以上酶类参与了炭疽叶枯病菌的侵染过程[71-72]。苹果不同组织被炭疽菌侵染后,PPO、POD、苯丙氨酸解氨酶(phenylalanine ammonia-lyase,PAL)等7 种酶活性均有不同程度的提高[73-75]。通过分析不同抗感品种感染炭疽菌后细胞壁降解酶活性的变化,证实甲基半乳糖醛酸酶(PMG)和羧甲基纤维素酶(Cx)在病菌侵染过程中发挥作用,且抗病品种中细胞壁降解酶活性高峰的出现早于感病品种[76]。白静科[30]比较了C.fructicola侵染后抗感品种中过氧化氢(H2O2)和乳突产生的差异,发现炭疽菌的侵染诱导了苹果细胞中H2O2的积累和乳突的产生,并随着侵染时间延长不断积累。此外,生防菌也可以通过提高感病品种嘎拉叶片中POD、CAT、SOD等防御酶活性,减少活性氧的积累,从而诱导苹果对炭疽菌的抗性[77]

3.2 植物激素

植物激素在植物防御和生长发育中发挥重要作用,与植物免疫反应相关的激素包括水杨酸(SA)、茉莉酸(JA)、乙烯(ET)、脱落酸(ABA)等。SA 和JA-ET 激素作为重要的调控因子,在苹果生物和非生物胁迫反应中发挥重要作用[78-79]。SA 是通过异分支酸合成酶(ICS)和苯丙氨酸解氨酶(PAL)途径合成。在应激条件下,超过90%的受刺激SA 是通过ICS合成的[80]。当没有遇到病原体或逆境时,植物细胞积累相对较低浓度的SA,外源喷施SA 可增强抗病相关酶的活性,诱导高感苹果品种对C.gloeosporioides 产生抗性[81-82]。在苹果中,藤牧1 号、40-9 及16-16 等抗性品种(系)中SA 合成相关基因MdEDS1MdPAD4MdPALC. gloeosporioides 诱导表达,SA 信号转导相关基因MdNPR1MdPR1MdPR5 的表达量显著高于嘎拉等感病品种(系)[83]。水杨酸合成途径中的关键酶MdICS1 可以被G.cingulata 诱导上调表达,而JA、ABA 和ETH 三种外源信号可抑制其表达。

3.3 苹果抗病基因挖掘

不同苹果品种对炭疽菌抗感表现存在差异,在田间苹果炭疽叶枯病的表现尤为突出[84]。马玉鑫[85]研究表明,寒富品种CDPK 基因家族成员MdCDPK24 基因在炭疽菌侵染后显著上调表达。对寒富苹果同源四倍体进行转录组测序,发现MdCaMBP6MdIPT8 在苹果炭疽叶枯病菌侵染后显著上调表达,能够提高品种抗性[86-87]。Guo 等[88]报道湖北苹果M. hupehensis YT521-B 同源结构域包含蛋白2(MhYTP2),其与MdRGA2L mRNA 结合并降低其稳定性,在调节对炭疽叶枯病的抗性中发挥重要作用,可用于开发具有GLS 抗性的苹果品种。刘源霞等[89]采用分离群体分组分析(BSA)方法,筛选获得了一个与抗病性状相关的分子标记S0506206-24,在此基础上,采用全基因组重测序和BSA 相结合的方法,在该杂交群体中定位了1 个苹果抗炭疽叶枯病基因位点Rgls,并将其精细定位于标记InDel4199和SNP4299 之间[90],室内接种验证与Rgls 位点紧密连锁的4 个分子标记S0405127(SSR)、S0304673(SSR)、SNP4236 和InDel4254,准确率均高于90%[91]

3.4 抗病相关转录因子参与的防御反应

植物被病原物感染后,当病原体相关的分子模式(PAMP)或效应器被植物识别时,细胞内的信号可以被激活,导致活性氧簇(ROS)的产生、丝裂原激活的蛋白激酶(MAPK)激活和防御基因的表达[62]。MAPKs 能够靶向并磷酸化调节下游基因转录的转录因子,最终响应病原菌的侵入。已报道的与炭疽菌侵染响应相关的转录因子有AP2/ERF、TGACG基序结合因子(BZIP)、MYC2(BHLH)、ARF、MYB、WRKY 和NAC 等7种,后两者是高等植物特有的转录因子家族[92]。WRKYs 转录因子作为MAPK 级联反应的重要靶标,在植物对病原菌的抗性中起关键作用。当病原菌侵入后,SA 依赖的WRKY 基因会迅速表达并积累,与抗病基因启动子上的W 盒[Wbox,TTGAC(C/T)]特异性结合,启动防御反应,从而形成复杂的WRKY调控网络。在苹果中,MKK4-MPK3 下游转录因子MdWRKY15、MdWRKY17 及MdWRKY100 通过调控SA 积累增强苹果对炭疽菌的抗性[70,93]。其中,MdWRKY100 正向调节苹果对C. gloeosporioides 的抗性;C. fructicola 可提高感病品种中MdWRKY17 蛋白积累,诱导MdMEK4-MdMPK3-MdWRKY17-MdDMR6-SA 途径,加速SA 降解,从而降低果树抗性[94]。此外,有研究表明,MdWRKY15 通过激活SA 合成酶MdICS1 的表达增强对轮纹病的抗性[95]。酯酶/脂肪酶GELP1 是MPK3/MPK6 及其下游转录因子MdWRKY100 的靶标,在苹果抵御病原菌侵染中发挥重要作用[96]。Li 等[97]和Lippok等[98]研究证实,γ-氨基丁酸(GABA)关键合成基因MdGAD1 能够与MdWRKY33 互作,增强转基因苹果愈伤组织形成和叶片的抗氧化能力,正向调控苹果对C. gloeosporioides 的抗性。此外,MdWRKY31能够与苹果超敏反应蛋白MdHIR4(hypersensitive-induced reaction protein,HIR)相互作用,影响SA 信号通路中基因的转录从而调节苹果对葡萄座腔菌B.dothidea 的抗性[99]。MdWRKY75 能够与MdRAC7 启动子结合,调节漆酶的生物合成,并在苹果斑点落叶病菌Alternaria alternata 感染期间促进了木质素的合成[100]。最新研究表明,MdVQ10 能够与MdWRKY75 互作,增强衰老相关基因MdSAG12MdSAG18的转录,促进叶片损伤引发的衰老进程[101]。然而,以上几个转录因子是否在苹果对炭疽菌抗性中也发挥着相同或类似的作用仍有待进一步验证(图3)。

图3 AtwrKY33 和MdWRKYs 参与MAPK 级联反应下游抗病原菌调控模式图[94-95,97-99,101]
Fig.3 Schematic model of AtwrKY33 and MdWRKYs involved in downstream pathogenic pathogens of the MAPK cascade

3.5 miRNA参与植物免疫的调控机制

非编码的RNA 分为微小RNA(microRNAs,miRNAs)和小干扰RNA(small interfering RNAs,siRNA)两大类,miRNA 是植物生长发育和胁迫应答中重要的调控因子[102]。miRNA 可能参与调节病原菌感染中胼胝质沉积过程,在模式植物拟南芥中,miR773 靶向抑制甲基转移酶2(MET2),影响胼胝质沉积和ROS 累积,负调控C. higginianum 的抗病性[103]。Zhang 等[104]研究发现,Md-miRln20 靶向Md-TN1-GLS负调控苹果对胶孢炭疽菌的侵染。此外,Zhang 等[105]研究证实两种CCR-NB-LRR 蛋白MdRNL2 和MdRNL6 能够形成复合物,抑制病原菌生长,提高了苹果树对苹果斑点落叶病菌A.alternata的抗性,进一步研究证实其同样能够提高果树对C.gloeosporioides的抗性[106]。张亚楠等[107]分析了抗感品种中抗病相关miRNA 的表达量差异,预测miR390a、miR482b 及miR396b/c/f 在苹果被炭疽菌侵染中发挥重要作用。Shen 等[108]研究发现,MdmmiR160-MdARF17-MdWRKY33 模块能够通过调节活性氧(ROS)提高苹果耐寒性能,但其对病原菌致病力的影响仍未证实。上述结果对果树抗病育种起重要的推动作用。

4 问题与展望

近年来,在分子生物学和生物信息学的推动下,苹果和炭疽菌互作方面的研究取得了巨大进展。笔者详细阐述了苹果炭疽菌组成、病原菌侵染相关基因及其与寄主互作的研究进展。明确病原菌致病过程及其分子机制,对苹果炭疽叶枯病的综合防控具有重要意义,随着各项研究的日益深入,研究者对炭疽病的防控思路必将有所转变。

炭疽菌对苹果产业造成巨大危害,由于炭疽菌具有潜伏侵染的特性,果树病害监测不仅耗时费力,还存在一定的技术难题。利用传统的化学防控手段,通过大量使用杀菌剂和杀虫剂等虽能达到对抗病原菌的效果,但对环境和人体也会造成严重的危害。随着生活水平的不断提高,健康问题已经逐渐成为关注的焦点。目前,研发生态友好型生物防治策略已经被人们广泛接受和认可,前景一片光明。开展抗性品种选育是从根本上解决果树炭疽菌防控难问题的有效手段,符合现代农业的生产需求[109-110]。解析抗病机制能够为苹果抗病性改良提供重要的理论依据,是果业科研的重点研究领域。

生物信息学和分子生物学的各种先进技术为作物改良提供了其他途径,能够极大地缩短果树育种周期,解决传统实生苗选育耗时长的难题。通过构建苹果高效遗传转化体系进一步开展基因编辑、RNA 干扰等生物育种技术研究,培育具有优良性状的苹果新种质或新品种是果树科研工作者努力的方向[110]

总之,了解苹果与炭疽菌互作的分子机制,能够为培育抗病品种和创新病害防控策略提供新的见解,对果树产业健康发展具有重要的指导意义。

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Advances in study of the interaction between apple and Colletotrichum gloeosporioides

JI Zhirui1,2,WANG Meiyu2, ZHANG Shuwu1, DU Yinan2, CONG Jialin2, XU Bingliang1*, ZHOU Zongshan2*
(1College of Plant Protection, Gansu Agricultural University, Lanzhou 730070, Gansu, China;2Research Institute of Pomology, Chinese Academy of Agricultural Science,Xingcheng 125100,Liaoning,China)

Abstract: Colletotrichum gloeosporioides can cause apple bitter rot,and anthracnose leaf blight,resulting in affecting fruit yield and quality, and causing serious economic losses to the apple industry. According to the latest fungal classification system, the C. gloeosporioides species complex consists of 13 different species, including C. gloeosporioides, C. aenigma and C. fructicola et al. Among them,C. fructicola and C. gloeosporioides are important pathogenic fungi on various fruit trees. Meanwhile,C. gloeosporioides can also cause diseases on other fruit trees such as cherry, passion fruit, and kiwifruit.In order to better prevent and control diseases,we need to have a comprehensive understanding of the classification,pathogenic mechanisms,and host interaction mechanisms of the pathogens on apples.In the process of colonizing host tissue, a number of C. gloeosporioides genes participate in different phases of infection procedures, which include conidiation, appressorium morphogenesis, melanization and penetration,biotrophy,necrotrophy,and various transport activities.In recent years,research on the pathogenic molecular mechanism of C. gloeosporioides on apples has mainly focused on the cloning and analysis of pathogenic related genes, screening and identification of effector proteins, pathogenic enzymes,and colletotoxins of C.gloeosporioides.Fungi secrete enzymes such as pectin,keratin and cellulase could help them successfully infect their hosts. New studies have shown that the adapter protein gene GcAP1 can regulate the expression of endopolygalacturonase genes (CgPG1 and CgPG2), pectin lyase genes (pnl-1, pnl-2), and pectate lyase genes (pelA, pelB), and GcAP1 is an important virulence factor of C. gloeosporioides. Currently, the successful application of PEG mediated genetic transformation and Agrobacterium mediated transformation in the study of C. gloeosporioides provides a basis for the development of pathogenic molecular mechanisms.It has been confirmed that the genes with different functions such as CgABCF2, CgCMK1, CgSET5, CgOpt1, CgNVF1, CgABCF2, CgChip6 are present in C. gloeosporioides, playing an important role in infecting apples. In addition, C2H2 transcription factors, cation stress response transcription factors CgSltA, CgCrzA, and CsHtf1 also play important roles in pathogen pathogenesis. During the infection process, C. gloeosporioides can also secrete a series of effectors to inhibit the host immune response, thereby promoting pathogen infection and colonization. Currently, scientists have analyzed the roles of effectors such as CfE12, CfEC92, and Sntf2 in C. gloeosporioides, laying the foundation for subsequent research on interactions of pathogen and host.In addition,C.gloeosporioides secrete toxins during the necrotrophic stage,causing necrosis of the host tissue.The research on apple disease resistance started relatively late,mainly focusing on germplasm resource identification, physiological and biochemical testing, disease resistance gene mining, plant hormone mediated disease resistance response, disease related transcription factors, and other mechanisms of action. Research has shown that after inoculation with anthrax fungus, the activities of superoxide dismutase (SOD), polyphenol oxidase (PPO), peroxidase (POD), catalase (CAT), and serotonin N-acetyltransferase (SNAT) in apple leaves increased, indicating that these enzymes are involved in the infection process of C. gloeosporioides. Plant hormones play an important role in plant defense and growth and development,and hormones related to plant immune responses include salicylic acid (SA),jasmonic acid (JA), ethylene (ET), abscisic acid (ABA), and so on. Research has shown that there are significant differences in the expression levels of SA synthesis related genes MdEDS1, MdPAD4, MdPAL and SA signal transduction related genes MdNPR1,MdPR1 and MdPR5 between resistant and susceptible varieties.There are differences in the resistance and susceptibility of different apple varieties to C. gloeosporioides. The Hanfu variety has been used to screen for resistance genes due to its high resistance to C. gloeosporioides. WRKY and NAC transcription factors play a crucial role in plant resistance to pathogen infection. In apples, transcription factors MdWRKY15, MdWRKY17, and MdWRKY100 enhance apple resistance to anthracnose by regulating SA accumulation. Here, we plotted the downstream regulatory patterns of AtwrKY33 and MdWRKYs involved in the MAPK cascade reaction,and presented some research results on MdWRKYs.At the end of the article, we summarized the research results on the regulatory mechanism of miRNA involvement in plant immunity. Clarifying the pathogenic process and molecular mechanism of the pathogen is of great significance for the comprehensive prevention and control of C. gloeosporioides. With the deepening of various studies, researchers will inevitably change their thinking on the prevention and control of C.gloeosporioides.Traditional chemical prevention and control methods, such as the extensive use of fungicides and insecticides, can achieve the effect of combating pathogens, but they also can cause serious harm to the environment and people.Breeding of resistant varieties is a fundamental means to solve the problems in preventing and controlling C.gloeosporioides.This article aimed to analyze the pathogenic mechanism of pathogens and their interaction with hosts,laying a theoretical foundation for screening potential candidate genes and breeding new varieties resistant to diseases.

Key words: Apples; Colletotrichum gloeosporioides; Infection mechanism; Disease resistance mechanisms

中图分类号:S661.1

文献标志码:A

文章编号:1009-9980(2024)06-1199-14

DOI:10.13925/j.cnki.gsxb.20240114

收稿日期:2024-03-13

接受日期:2024-04-07

基金项目:中央级公益性科研院所基本科研业务费专项(1610182023012);国家现代农业产业技术体系(CARS-27);中国农业科学院科技创新工程专项(CAAS-ASTIP-2021-RIP-05)

作者简介:冀志蕊,女,在读博士研究生,研究方向为果树病害流行与综合防控。Tel:0429-3598236,E-mail:xinyu_jzr@163.com

*通信作者 Author for correspondence.E-mail:xubl@gsau.edu.cn;Tel:0429-3598268,E-mail:zhouzongshan@caas.cn