A new anthracnose disease of pyrethrum caused by<i><scp>C</scp>olletotrichum tanaceti</i>sp. nov

Barimani, M.; Pethybridge, SJ; Vaghefi, Niloofar; Hay, FS; Taylor, P. W. J.

doi:10.1111/ppa.12054

Cited by 37 publications

(32 citation statements)

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“…Recent taxonomic studies of Colletotrichum spp. resulted in the recognition of many new species from different hosts, thus making it more important to confirm the status of Colletotrichum taxonomy in Australia Barimani et al, 2013). Many tropical countries close to Australia produce, export and consume a range of fruits and vegetables, and hence the accurate identification of postharvest pathogens will have a significant impact on agriculture, biosecurity and quarantine (Than et al, 2008;Phoulivong et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Colletotrichum species associated with chili anthracnose in Australia

et al. 2016

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Phylogenetic relationships were determined for 45 Colletotrichum isolates causing anthracnose disease of chili in Queensland, Australia. Initial screening based on morphology, ITS and TUB2 genes resulted in a subset of 21 isolates being chosen for further taxonomic study. Isolates in the C. acutatum complex were analysed using partial sequences of six gene regions (ITS, GAPDH, ACT, CHS-1, TUB2 and HIS3), and in the C. gloeosporioides complex using four gene regions (ITS, TUB2, ApMat and GS). Phylogenetic analysis delineated four Colletotrichum species including C. siamense, C. simmondsii, C. queenslandicum, C. truncatum and a new Colletotrichum species, described here as C.cairnsense sp. nov. This is the first reported association of C. queenslandicum, C. simmondsii and C. siamense with chili anthracnose in Australia, as these species were previously Accepted ArticleThis article is protected by copyright. All rights reserved. associated with anthracnose on papaya and avocado. Furthermore, the dominant species causing anthracnose of chili in SE Asia, C. scovillei, was not detected in Australia.Inoculations on chili fruit confirmed the pathogenicity of C. cairnsense and the other four species in the development of chili anthracnose in Australia.

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Section: Introductionmentioning

confidence: 99%

Colletotrichum species associated with chili anthracnose in Australia

et al. 2016

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“…Sixteen Paraphoma isolates were selected from different geographical locations in northern Tasmania. This included four Paraphoma isolates (BRIP 65168, BRIP 65169, BRIP 65170 and BRIP 65171) isolated from leaf lesions by N. Vaghefi in from pyrethrum plants at Table Cape and eight isolates collected by T. Pearce, F. Hay and J. Scott between 2012 and 2014 from pyrethrum leaf lesions (BRIP 57988, BRIP 57989, BRIP 65173, BRIP 65174, BRIP 65176, BRIP 65177, BRIP 65178 and BRIP 65179), which were identified at that time to be P. chrysanthemicola by Hay et al . ().…”

Section: Methodsmentioning

confidence: 99%

Paraphoma chlamydocopiosa sp. nov. and Paraphoma pye sp. nov., two new species associated with leaf and crown infection of pyrethrum

et al. 2017

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Two new pathogens of pyrethrum, described as Paraphoma chlamydocopiosa and Paraphoma pye, isolated from necrotic leaf lesions on pyrethrum plants in northern Tasmania, Australia, were identified using morphological characters, phylogenetic analysis of the internal transcribed spacer (ITS), elongation factor 1-a (EF1-a) and b-tubulin (TUB) genes, and pathogenicity bioassays. Bootstrap support in the combined and individual gene region phylogenetic trees supported the two species that were significantly different from the closely related P. chrysanthemicola and P. vinacea. Morphological characteristics also supported the two new species, with conidia of P. chlamydocopiosa being considerably longer and wider than either P. chrysanthemicola or P. vinacea, and P. pye being distinct in forming bilocular pycnidia. Glasshouse pathogenicity tests based on root dip inoculation resulted in P. chlamydocopiosa and P. pye infecting the crown and upper root tissues of pyrethrum plants, and significant reduction in biomass 2 months after inoculation. Both of these Paraphoma species caused leaf lesions during in vitro and in vivo bioassays 2 weeks after foliar spray inoculation. Although P. chlamydocopiosa and P. pye were shown to be crown rot pathogens, they were also commonly isolated from leaves of diseased plants in pyrethrum fields of northern Tasmania.

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“…Insights into the genomic organization and the pathogenicity gene repertoire of other Colletotrichum species in the destructivum complex therefore, will significantly expand the knowledge base of this important genus. Colletotrichum tanaceti, a member of the destructivum complex [16], is an emerging foliar fungal pathogen [17] of Dalmatian pyrethrum (Tanacetum cinerariifolium). Pyrethrum is commercially cultivated as a source of the natural insecticide pyrethrin [18].…”

Section: Introductionmentioning

confidence: 99%

“…Colletotrichum tanaceti has been consistently reported in Australian field surveys of the crop [19] since 2013 [17] and causes leaf anthracnose, with black, water-soaked, sunken lesions [17]. Due to its hemibiotrophic lifestyle, characteristic symptoms of C. tanaceti are not evident on leaves until around 120 hours after infection [17,20], when it switches from biotrophy to necrotrophy. A significant reduction in green leaf area occurs usually 10 days after infection [17].…”

Section: Introductionmentioning

confidence: 99%

“…Due to its hemibiotrophic lifestyle, characteristic symptoms of C. tanaceti are not evident on leaves until around 120 hours after infection [17,20], when it switches from biotrophy to necrotrophy. A significant reduction in green leaf area occurs usually 10 days after infection [17]. This suggests a rapid disease cycle for C. tanaceti in pyrethrum and, given its aggressiveness, the potential for serious crop damage.…”

Section: Introductionmentioning

confidence: 99%

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Comparative genome analysis indicates rapid evolution of pathogenicity genes inColletotrichum tanaceti

Lelwala

Korhonen

Young

et al. 2019

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23Colletotrichum tanaceti is an emerging foliar fungal pathogen of pyrethrum (Tanacetum 24 cinerariifolium), posing a threat to the global pyrethrum industry. Despite being reported 25 consistently from field surveys in Australia, the molecular basis of pathogenicity of C.26 tanaceti on pyrethrum is unknown. Herein, the genome of C. tanaceti (isolate BRIP57314) 27 was assembled de novo and annotated using transcriptomic evidence. The inferred 28 pathogenicity gene suite of C. tanaceti comprised a large array of genes encoding secreted 29 effectors, proteases, CAZymes and secondary metabolites. Comparative analysis of its 30 CAZyme pathogenicity profiles with those of closely related species suggested that C. 31tanaceti had additional hosts to pyrethrum. The genome of C. tanaceti had a high repeat 32 content and repetitive elements were located significantly closer to genes inferred to 33 influence pathogenicity than other genes. These repeats are likely to have accelerated 34 mutational and transposition rates in the genome, resulting in a rapid evolution of certain 35CAZyme families in this species. The C. tanaceti genome consisted of a gene-sparse, A-T 36 rich region facilitating a "two-speed" genome. Pathogenicity genes within this region were 37 likely to have a higher evolutionary rate than the 'core' genome. This "two-speed" genome 38 phenomenon in certain Colletotrichum spp. was hypothesized to have caused the clustering of 39 species based on the pathogenicity genes, to deviate from taxonomy. With the large repertoire 40 of pathogenicity factors that can potentially evolve rapidly in response to control measures, 41 C. tanaceti may pose a high-risk to global pyrethrum production. Knowledge of the 42 pathogenicity genes will facilitate future research in disease management of C. tanaceti and 43 other Colletotrichum spp.. 44 45 46 Evolution 65 tanaceti has been consistently reported in Australian field surveys of the crop [19] since 2013 66 [17] and causes leaf anthracnose, with black, water-soaked, sunken lesions [17]. Due to its 67 hemibiotrophic lifestyle, characteristic symptoms of C. tanaceti are not evident on leaves 68 until around 120 hours after infection [17, 20], when it switches from biotrophy to 69 necrotrophy. A significant reduction in green leaf area occurs usually 10 days after infection 70 [17]. This suggests a rapid disease cycle for C. tanaceti in pyrethrum and, given its 71 aggressiveness, the potential for serious crop damage. 4 72The molecular basis of pathogenicity of C. tanaceti, which includes the pathogenicity genes 73 and their evolution, has not been studied. Colletotrichum tanaceti has only been reported 74 from pyrethrum in Australia, but may have crossed over from another plant host species. 75However, cross-host pathogenicity has not yet been assessed and the pathogen's origin and 76 the potential host range are currently unknown. Therefore, the threat posed by C. tanaceti to 77 the local and global pyrethrum industry remains largely unknown. 78The genome sequence of an emer...

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A new anthracnose disease of pyrethrum caused byColletotrichum tanacetisp. nov

Cited by 37 publications

References 25 publications

Colletotrichum species associated with chili anthracnose in Australia

Colletotrichum species associated with chili anthracnose in Australia

Paraphoma chlamydocopiosa sp. nov. and Paraphoma pye sp. nov., two new species associated with leaf and crown infection of pyrethrum

Comparative genome analysis indicates rapid evolution of pathogenicity genes inColletotrichum tanaceti

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