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Reveglia, P.;  Billones-Baaijens, R.;  Savocchia, S. Phytotoxic Metabolites and Fungi of Grapevine Trunk Diseases. Encyclopedia. Available online: https://encyclopedia.pub/entry/40154 (accessed on 01 September 2024).
Reveglia P,  Billones-Baaijens R,  Savocchia S. Phytotoxic Metabolites and Fungi of Grapevine Trunk Diseases. Encyclopedia. Available at: https://encyclopedia.pub/entry/40154. Accessed September 01, 2024.
Reveglia, Pierluigi, Regina Billones-Baaijens, Sandra Savocchia. "Phytotoxic Metabolites and Fungi of Grapevine Trunk Diseases" Encyclopedia, https://encyclopedia.pub/entry/40154 (accessed September 01, 2024).
Reveglia, P.,  Billones-Baaijens, R., & Savocchia, S. (2023, January 13). Phytotoxic Metabolites and Fungi of Grapevine Trunk Diseases. In Encyclopedia. https://encyclopedia.pub/entry/40154
Reveglia, Pierluigi, et al. "Phytotoxic Metabolites and Fungi of Grapevine Trunk Diseases." Encyclopedia. Web. 13 January, 2023.
Phytotoxic Metabolites and Fungi of Grapevine Trunk Diseases
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This entry is adapted from the peer-reviewed paper 10.3390/plants11233382

Grapevines are one of the most economically important crops worldwide, with approximately 48% of the world’s grape production used for wine production. Fungal diseases are limiting factors to the production of wine grapes, impacting the quality of wine. Grapevine trunk diseases (GTDs), caused by one or several fungal pathogens, cause a progressive decline in vines resulting in a loss in productivity and eventual death of the vines. Internal and external GTDs symptoms sometimes take several years to appear after infection; thus, they are considered slow-progression diseases.

Vitis vinifera GTDs phytotoxins omics

1. Phytotoxic Metabolites Produced by Fungi Involved in Esca Complex

Fungi involved in Esca complex disease include Phaeomoniella chlamydospora, 27 species of Phaeoacremonium, Pleurostoma richardsiae, and ten species of Cadophora [1][2][3][4][5].
Among the different Phaeoacremonium and Cadophora spp. occurring in Esca, Phaeoacremonium minimum and Cadophora luteo-olivacea are the most prevalent [1][6].
The above-mentioned fungi belong to the Ascomycota phylum and have been isolated from grapevine necrotic wood and identified by molecular techniques using actin and β-tubulin gene regions [3]. Finally, numerous basidiomycetous species have been isolated from grapevine wood showing Esca symptoms. These fungi belong to the genera Fomitiporia, Inocutis, Inonotus, Fomitiporella, Phellinus, and Stereum. However, their role in the symptomatology of the disease requires further study [2][7].
The draft genome sequence of both P. minimum and Ph. chlamydospora are available [8][9]. In both fungi, the genome was enriched in clusters associated with secondary metabolism, including those encoding polyketide synthetases (PKS), non-ribosomal peptide synthetases (NRPS), and also secreted proteins predicted to be putative plant CAZymes [10]. More recently, comparative genome analysis and high throughput transcriptome studies have been conducted on Ph. chlamydospora [11].
The first reported PMs (Figure 1) from P. minimum were the naphthalenone pentaketides derivative named scytalone (1) and isosclerone (2) together with 4-hydroxybenzaldehyde (3) identified by spectroscopic method, essentially NMR [12][13]. The metabolites were assayed on detached grapevine leaves, compound 1 caused chlorosis, rounded to irregular, interveinal, or marginal spots, while 2 caused large, coalescent chlorotic and necrotic spots followed by withering and distortion of the lamina. The most recent report of PMs isolated from the culture filtrate of P. minimum dates back to 2004 when Mansour et al. [14] investigated the neutral organic extract and the acid organic extract. The neutral organic extract yielded scytalone (1), isosclerone (2), 4-hydroscytalone (4), 2,4,8-trihydroxytetralone (5), 3,4,8-trihydroxytetralone (6), 1,3,8-trihydroxynaphthalene (7). The main compounds in the acidic extract were flaviolin (8), isolated with traces of 2-hydroxyjuglone (9). These compounds were assayed on grapevine callus and Arabidopsis thaliana. The isolated PMs were divided into tetralones, such as scytalone and isosclerone, which promote callus growth, and naphthoquinones, like 2-hydroxyjuglone and flaviolin, which inhibit growth [14]. Little information is known about the function of the naphthalenone pentaketides 1–9 in vine cells or tissues [13][15]. Their activity might be related to their oxidant property, especially their interaction with reactive oxygen species (ROS) produced by the plant during the defense response [16][17]. Thus, the presence of the typical tiger-stripe symptoms on leaves from grapevines infected with Esca may be related to physiological changes caused by toxic metabolites produced by the causal pathogens in the trunk. Herein, these changes would be a response of the vine to the disease [15]. When the PMs were isolated and identified from the pathogens involved in Esca and BD, this hypothesis was also extended to these two GTDs [15]. However, further investigations are needed to support this hypothesis and to correlate the production of PMs with foliar symptoms.
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Figure 1. Structure of scytalone (1), isosclerone (2), 4-hydroxybenzaldehyde (3), 4-hydroscytalone (4), 2,4,8-trihydroxytetralone (5), 3,4,8-trihydroxytetralone (6), 1,3,8-trihydroxynaphthalene (7), flaviolin (8), 2-hydroxyjuglone (9), tyrosol (10), 1-O-methylemodine (11), 3-hydroxy-5decanolide (12), (S)-4-hydroxyphenyllactic acid (13), 3-(3-methyl-2-butenyloxy) -4-hydroxybenzoic acid (14).
Phaeomoniella chlamydospora was also investigated and produced the PMs tyrosol (10), 1-O-methylemodine (11), 3-hydroxy-5decanolide (12), (S)-4-hydroxyphenyllactic acid (13), 3-(3-methyl-2-butenyloxy)-4-hydroxybenzoic acid (14) (Figure 2). They were isolated together with the already reported scytalone (1) and isosclerone (2), and p-hydroxybenzaldehyde (3). Compound 3 showed the highest activity, inhibiting the protoplast growth of 20% at 100 mM and 100% at 1 mM. The two organic acids (S)-4-hydroxyphenyllactic acid (13), 3-(3-methyl-2-butenyloxy)-4-hydroxybenzoic acid (14) were also active on protoplasts at 1 mM concentration. Moreover, the authors point out that the aromatic aldehyde function, in the ortho or para position, is always present in the structures of the active metabolites and could be related to their activity [13].

2. Phytotoxic Metabolites Produced by Fungi Involved in Eutypa Dieback

The fungus Eutypa lata is a diatrypaceous fungus that is considered the main causal agent of Eutypa dieback. Although 22 species of diatrypaceae have been isolated from a grapevine showing typical ED symptoms [1][18][19][20], only E. lata is known to cause the typical foliar symptoms associated with this GTD [6][20][21].
These fungi have been isolated from asymptomatic tissues several centimeters ahead of lesion margins, indicating pathogen latency. Eutypa lata, among other GTD pathogens, was also found in asymptomatic grapevines aged 40 years or older, highlighting that there could be a balance between the plant microbiome and pathogenic fungi, assisting in preventing the development of the disease [22].
The first draft genome sequence of E. lata (UCR-EL1) was published in 2013 [23]. The study provided a preliminary inventory of the potential virulence factors and an abundant repertoire of cell wall-degrading enzymes, and a high number of putative cytochrome P450 monooxygenases implicated in lignin oxidation [23]. In 2015, Morales-Cruz and co-authors highlighted a great expansion of families of genes involved in the biosynthesis of toxins, including polyketide synthesis (t1PKS) [24]. More recently, the first whole-genome sequencing and comparative genomics study on 40 E. lata isolates from Australia was reported [25].
The first investigation on PMs produced by E. lata was carried out in 1989 [26], where the screening of the bioactive organic fractions led to the isolation of eight new aromatic compound metabolites characterized by a 3-methylbut-3-en-1-ynyl functional group: eutypine (15), eutypinol (16), O-methyleutypine (17), O-methyleutypinol (18), eutypune carboxylic acid (19), 4-ydroxy-3,4-dihydroxy-3-methylbut-l-ynyl)benzyl alcohol (20), 4-hydroxy-3-(3,4-dihydroxy-3-methylbut-l-ynyl)benzaldehyde (21), 3-hydroxy-3,4-diliydroxy-3-methylbut-I-ynyl)benzoic acid (22) (Figure 2). Moreover, the authors detected 5-formyl-2-(methylvinyl)[1]benzofuran (23) in the culture medium, which is also obtained from compound 1 under middle acid condition (Figure 2). The compounds were tested on tomato seedlings and grapevine leaves. Eutypine (15) showed the highest phytotoxic activity. Moreover, the authors suggested that the aldehyde group and a free OH in para-position could be necessary for the activity [27].
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Figure 2. Structure of scytalone eutypine (15), eutypinol (16), O-methyleutypine (17), O-methyleutypinol (18), eutypune carboxylic acid (19), 4-ydroxy-3,4-dihydroxy-3-methylbut-l-ynyl)benzyl alcohol (20), 4-hydroxy-3-(3,4-dihydroxy-3-methylbut-l-ynyl)benzaldehyde (21), 3-hydroxy-3,4-diliydroxy-3-methylbut-I-ynyl)benzoic acid (22), 5-formyl-2-(methylvinyl)[1]benzofuran (23), 5-(3-methylbuta-l.3-dienylidene)-2,3-epoxycyclohexane-l,4-diol (24), 6-hydroxy-2,2-dimethyl-5,6.7,8-tetrahydro-7,8-epoxychroman (25) and 8-hydroxy-2,2-dimethyl-5.6,7,8-tetrahydro-6.7-epoxychroman (26), eutypoxide B (27), eulatinol (28), siccayne (29), eulatachromene (30).
In the same year, the same authors isolated novel allenic epoxycyclohexanes 5-(3-methylbuta-l.3-dienylidene) -2,3-epoxycyclohexane-l,4-diol (24), 6-hydroxy-2,2-dimethyl-5,6.7,8-tetrahydro-7,8-epoxychroman (25) and 8-hydroxy-2,2-dimethyl-5.6,7,8-tetrahydro-6.7-epoxychroman (26) (Figure 2), together with the already reported Eutypine (15). Their structures were established by a combination of spectroscopic, X-ray, and chemical modifications. Again, the most active compound was Eutypine (15). Finally, the authors suggested that compound 24 could be the key intermediate in the transformation of acetylenic compounds into tetrahydrochromanone derivatives [26].
Eutypoxide B (27), biogenetically related to 5-(3-methylbuta-l.3-dienylidene)-2,3-epoxycyclohexane-l,4-diol (24), was isolated from the culture filtrate of E. lata. The structure was confirmed by NMR and X-ray. The authors also conducted a total synthesis of 27, revealing that the key intermediate for the synthesis is a cyclohexanecarbaldehyde compound [28].
Molyneux and co-authors studied three strains of E. lata and their metabolites produced in artificial media by HPLC and GC MS [29]. The novel metabolites eulatinol (28), which is structurally related to the already known siccayne (29), and eulatachromene (30) (Figure 3), a novel chromene analog, were identified by spectroscopic methods as a methoxyquinol derivative. Only one strain produced eutypine (15) in a low amount, whereas the primary metabolite was the corresponding alcohol, eutypinol (16). In the bioassay on grapevine leaf discs, neither eutypinol (15) nor siccayne (29) showed phytotoxicity, whereas eulatinol (28) and eulatachromene (30) caused necrotic spots [29].
Several attempts have been made to identify eutypine from different tissues showing ED symptoms [30][31][32]. In vitro cultures of E. lata isolates produced various SMs, of which eutypine was the main metabolite. However, HPLC analysis of extracts from wood, shoots, and leaves exhibiting symptoms of dieback failed to show the presence of any metabolites [31]. Micropropagated grapevine plantlets treated with crude or purified culture filtrates from nine isolates of E. lata grown on malt yeast broth resulted in various SMs being identified. However, no single compound was consistently detected [32]. A derivative of eutypine, eutypinol, was detected in micropropagated grapevine plantlets inoculated with E. lata mycelium, but PMs were not detected in the sap of vines that had been artificially inoculated with the pathogen [32]. The reasons for the unsuccessful detection of eutypine remain unclear. However, it is possible that following their production; such metabolites are rapidly broken down into compounds that cannot be detected by HPLC [31]. Alternatively, the translocation of metabolites does not occur because the compounds are sufficiently reactive damaging plant tissues in the proximity of fungal infection, reacting in such a way that they are bound irreversibly. Finally, the authors of these studies suggested that as phenolic compounds, the metabolites would be susceptible to oxidative polymerization by plant phenol oxidases, possibly accounting for the dark, wedge-shaped areas typical of E. lata infection [30][31][32].

3. Phytotoxic Metabolites Produced by Fungi Involved in Botryosphaeria Dieback

Botryosphaeriaceae have a cosmopolitan distribution and occur on a wide range of annual and perennial hosts, including grapevines [33][34][35]. They have been described as endophytes or latent pathogens causing serious diseases [35][36]. However, the status of Botryosphaeriaceae species as endophytes in grapevines remains unclear [37]. Botryosphaeriaceae species occur in grape-growing regions of Africa, Asia, Australia, Central America, Europe, and South America [38][39][40][41]. Different species of Botryosphaeriaceae belonging to the genera Botryosphaeria, Diplodia, Dothiorella, Lasiodiplodia, Neofusicoccum, Neoscytalidium, Phaeobotryosphaeria and Spencermartinsia have been reported to be associated with BD of grapevines worldwide. The isolation of S. westrale, S. plurivora, Do. neclivorem, Do. vineagemmae and Do. vidmadera from perennial cankers has brought the total number of Botryosphaeriaceous species isolated from grapevines worldwide to 40 [42][43][44][45][46]. The species infecting grapevines can be classified according to their virulence and can be divided into three different groups, including the highly virulent species, Lasiodiplodia spp. and Neofusicoccum spp., intermediately virulent B. dothidea and Diplodia spp., while Dothiorella spp. and S. viticola are weakly virulent [37].
Low genetic variability is reported from many geographical locations for Botryosphaeria, Diplodia, and Lasiodiplodia species [47]. The first draft of the N. parvum genome was published in 2013, while the first draft genome sequence of D. seriata isolate F98.1 was obtained by Siegwald and co-authors [48]. Studies focused on genetic diversity, the evolution of possible virulence factors, and the pathogenicity of Botryosphaeriaceae species have demonstrated variable levels of virulence between species and isolates [49][50][51][52][53]. All these pathogens have gene clusters involved in the production of carbohydrate-active enzymes (CAZymes), peroxidases, cytochrome P450s, cellular transporters, and secondary metabolism, with a particular focus on toxin production [10][24].
Studies on the phytotoxicity of PMs produced by Botryosphaeriaceae spp. involved in GTDs were first reported by Martos, Andolfi et al. [54]. Species isolated from declining grapevines in Spain (B. dothidea, D. seriata, Do. viticola, N. luteum and N. parvum) produced hydrophilic high-molecular-weight compounds, exopolysaccharides (EPSs) with phytotoxic properties in liquid culture. In addition, lipophilic low molecular weight phytotoxins were isolated from the organic extracts of the culture filtrates of N. luteum, and N. parvum [54].
Among the Botryosphaeriaceae spp. infecting grapevines worldwide, N. parvum and D. seriata are, respectively, the most aggressive and the most widespread worldwide [37], and therefore they are the most studied species producing PMs. Several phenolic dihdroisocoumarins, such as (R)-mellein (31), (3R,4R)-and (3R,4S)-4-hydroxy melleins (32,33) and 5-hydroxymellein (34) (Figure 3) were identified from the organic extract of the culture filtrate of D. seriata [55]. Furthermore, an unknown mellein characterized by NMR was identified as (3R,4R)-4,7- dihydro9mellein (35, Figure 3).
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Figure 3 Structure of: (R)-mellein (31), (3R,4R)-and (3R,4S)-4-hydroxy melleins (32, 33), 5-hydroxymellein (34), (3R,4R)-4,7- dihydroxy mellein (35), (+)-terremutin (36), (+)-terremutin hydrate (37), (+)-epi-sphaeropsidone (38), (-)-4-chloro-terremutin hydrate (39), (+)-4—hydroxysuccinate-terremutin hydrate (40), (6R,7R)-asperlin (41), (6R,7S)-dia-asperlin (42), (R)-3-hydroxymellein(43), 6-methyl-salicylic acid (44) and 2-hydroxypropyl salicylic acid (45).
For N. parvum, four phytotoxic metabolites were isolated from organic extracts and identified by spectroscopic and physical examination as isosclerone (2), tyrosol (10, Figure 2), and the previously reported 4-hydroxy-mellein cis and trans mellein (32, 33 Figure 4) [56]. Liquid chromatography-diode array screening of the organic extract of the cultures of 13 isolates of N. parvum resulted in 13 compounds belonging to four different chemical families being identified through spectroscopic analyses and by comparison to previously published literature as detailed in Figure 3: (R)-mellein (31), (3R,4R)-and (3R,4S)-4-hydroxy melleins (32, 33), (+)-terremutin (36), (+)-terremutin hydrate (37) (+)-epi-sphaeropsidone (38), (-)-4-chloro-terremutin hydrate (39), (+)-4—hydroxysuccinate-terremutin hydrate (40), (6R,7R)-asperlin (41), (6R,7S)-dia-asperlin (42), (R)-3-hydroxymellein (43), 6-methyl-salicylic acid (44), 2-hydroxypropyl salicylic acid (45) [57].
(R)-mellein and its derivatives belong to the class of isocoumarines, a class of natural compounds well known to have a wide range of biological activity [58][59]. Moreover, (R)-mellein is a typical PM produced by Botryosphaeriaceae spp. involved in GTD and is phytotoxic to grapevine leaves at different concentrations [55][56].
Ramirez-Suero et al. showed that (R)-mellein could not explain the toxicity of the extracellular organic extract of D. seriata and N. parvum [60]. Purified (R)-mellein was added to the culture medium of calli, but only delayed necrosis and a lower-level expression of defense genes was observed. In addition, the extracellular compounds from N. parvum appeared to be more toxic than those produced by D. seriata. Finally, the authors suggested that it is possible that the pathogenicity of these two fungi depends on synergistic action between the secretion of other types of PMs, such as derivatives of mellein or high molecular weight phytotoxins such as polypeptides or EPSs [60].
The extracellular EPSs produced by an isolate of N. parvum isolated from infected grapevine wood in a vineyard in Spain were biologically and chemically characterized by Cimmino et al. [61]. The EPS was characterized as a mannan having a backbone consisting of (1→6)-linked mannopyranose units, almost all branched at the 2nd position, whereby the arms were composed of 2- and/or 3- linked units. The phytotoxic activity was observed when assayed on grapevine leaves. However, the three replicates of each tested concentration developed symptoms at different times, and differences in the type of symptoms induced were observed; therefore, a conclusion could not be drawn [61].
More recently, purified secreted proteins by N. parvum and D. seriata were assayed on suspension cells of two different Vitis genotypes (V. rupestris and V. vinifera cv. Gewurztraminer) with putative varying susceptibility to BD [62]. The Vitis cells were able to detect secreted proteins produced by Botryosphaeriaceae and respond by producing ROS and by the production of reactive oxygen species and prompt alkalinization of the extracellular medium. Vitis rupestris is characterized by higher medium alkalinization, cell death, and more intense induction of pathogenesis-related genes, whereas V. vinifera cv. Gewurztraminer produced a higher amount of antifungal compound δ-viniferin. The results further suggested that even if the grapevine can react rapidly to BD pathogens, the defense responses are most likely not strong enough to restrict the growth of the pathogen. However, further studies are required to determine the sequences of the secreted proteins and their mode of action [62].
Neofusicoccum australe involved in grapevine decline in Sardinia produced a new cyclohexenone oxide, namely, cyclobotryoxide (46, Figure 4), that was isolated together with 3-methylcatechol (47, Figure 3) and tyrosol. Cyclobotryoxide was the most active metabolite in the different bioassays performed [63].
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Figure 4. Structure of cyclobotryoxide (46), 3-methylcatechol (47), jasmonic acid (48), jasmonic acid methyl ester (49), lasiojasmonate A (50), lasiojasmonates B and C (51, 52), lasiolactol A and B (53, 54), botryosphaeriodiplodin (55), (5R)-5-hydroxylasiodiplodin (56), (3S,4R,5R)-4-hydroxymethyl-3,5-dimethyldihydro-2-furanone (57) and p-hydroxybenzoic acid (58).
Several endophytic and pathogenic fungi can produce PMs that are also biosynthesized by their host plants [64]. The GTD pathogens, Lasiodiplodia spp., are capable of producing jasmonic acid (48, Figure 4), a known plant hormone, and some of its derivatives when grown in in vitro conditions. Jasmonic acid, its methyl ester (49, Figure 4), and Lasiojasmonate A-C (50-52, Figure 4) were isolated from the grapevine pathogen L. mediterannea [65]. The mode of action of jasmonic acid and lasiojasmonate A as fungal phytotoxins were investigated, and the results suggested that the production of a jasmonic acid derivative such as lasiojasmonate A occurs during the late stages of infection to induce plant jasmonic acid responses such as cell death and to facilitate fungal infection [66][67].
More recently, two novel compounds identified as lasiolactol A and B were isolated and characterised (53, 54 Figure 4) from another strain of L. mediterranea isolated from grapevines in Sicily. These two novel molecules were isolated together with botryosphaeriodiplodin (55, Figure 4), (5R)-5-hydroxylasiodiplodin (56, Figure 4), and (3S,4R,5R)-4-hydroxymethyl-3,5-dimethyldihydro-2-furanone (57, Figure 4), all previously characterized secondary metabolites [68].

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Subjects: Chemistry, Analytical
Contributors MDPI registered users' name will be linked to their SciProfiles pages. To register with us, please refer to https://encyclopedia.pub/register :
Pierluigi Reveglia
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Regina Billones-Baaijens
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Sandra Savocchia
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Update Date: 16 Jan 2023
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