Phomopsis husk rot of macadamia in Australia and South Africa caused by novel <i>Diaporthe</i> species

Wrona, Christopher; Mohankumar, Vheena; Schoeman, M.H.; Tan, Yu Pei; Shivas, R. G.; Jeff-Ego, Olumide S.; Akinsanmi, Olufemi A.

doi:10.1111/ppa.13170

Cited by 22 publications

(14 citation statements)

References 35 publications

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“…In the PHI analysis, there was no evidence of significant genetic recombination (Fw = 0.550) among our isolates (ZHKUCC 22-0039) and its closely related taxa ( D. australiana (BRIP 66145), D. eucalyptorum (CBS 132525), D. hongkongensis (CBS 115448), D. lithocarpus (CGMCC 3.15175), and D. salinicola (MFLUCC 18.0553)). Morphologically, ZHKUCC 22-0039 strain develops a significantly higher amount of gamma conidia while other closely related species D. australiana [ 46 ], D. eucalyptorum [ 41 ], D. hongkongensis [ 2 ], D. lithocarpus [ 11 ], and D. salinicola [ 47 ] are not developing. Considering both morphological and molecular data, here we introduce our isolates as a novel Diaporthe species.…”

Section: Resultsmentioning

confidence: 99%

“…For example, in 2020, 34 new species were introduced, and in 2021, 37 new species were introduced (Index Fungorum 2022, accessed on 15 June 2022). Almost all these species were introduced based on molecular phylogeny following the phylogenetic species concept [ 13 , 27 , 46 ]. However, Diaporthe species do not have enough morphologies to distinguish; thus, the phylogenetic tree with five loci became the key tool to define the species.…”

Section: Discussionmentioning

confidence: 99%

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Endophytic Diaporthe Associated with Morinda officinalis in China

Luo

Guo

Zhao

et al. 2022

JoF

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Diaporthe species are endophytes, pathogens, and saprobes with a wide host range worldwide. However, little is known about endophytic Diaporthe species associated with Morinda officinalis. In the present study, 48 endophytic Diaporthe isolates were obtained from cultivated M. officinalis in Deqing, Guangdong Province, China. The nuclear ribosomal internal transcribed spacer (ITS), partial sequences of translation elongation factor 1-α (tef1-α), partial calmodulin (cal), histone H3 (his), and Beta-tubulin (β-tubulin) gene regions were sequenced and employed to construct phylogenetic trees. Based on morphology and combined multigene phylogeny, 12 Diaporthe species were identified, including five new species of Diaporthe longiconidialis, D. megabiguttulata, D. morindendophytica, D. morindae, and D. zhaoqingensis. This is the first report of Diaporthe chongqingensis, D. guangxiensis, D. heliconiae, D. siamensis, D. unshiuensis, and D. xishuangbanica on M. officinalis. This study provides the first intensive study of endophytic Diaporthe species on M. officinalis in China. These results will improve the current knowledge of Diaporthe species associated with this traditional medicinal plant. Furthermore, results from this study will help to understand the potential pathogens and biocontrol agents from M. officinalis and to develop a disease management platform.

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Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Endophytic Diaporthe Associated with Morinda officinalis in China

Luo

Guo

Zhao

et al. 2022

JoF

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“…Since these revolutionary studies, more than 50 novel Diaporthe species have been identified in China ( Huang et al., 2013 ; Huang et al., 2015 ; Gao et al., 2016 ; Gao et al., 2017 ; Yang et al., 2017a ; Yang et al., 2017b ; Yang et al., 2018 ; Fan et al., 2018 ; Yang et al., 2020 ). New records and species have been reported on the basis of molecular evidence ( Rossman et al., 2015 ; Dissanayake et al., 2017 ; Guarnaccia and Crous, 2017 ; Perera et al., 2018 ; Tibpromma et al., 2018 ; Wanasinghe et al., 2018 ; Wrona et al., 2020 ).…”

Section: Discussionmentioning

confidence: 99%

Cytospora and Diaporthe Species Associated With Hazelnut Canker and Dieback in Beijing, China

Hong

Pan

Tian

et al. 2021

Front. Cell. Infect. Microbiol.

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Hazelnut (Corylus heterophylla Fisch.) is an important nut crop in China but has been declining owing to the destructive effects of fungal branch canker and dieback. The identification and management of these pathogens are difficult because of the lack of attention to branch canker, insufficient understanding of phylogenetic, and overlapping morphological characteristics of the pathogens. In total, 51 strains were isolated from Chinese wild hazelnut in this study, and three species of Cytospora and two of Diaporthe were identified through morphological observation and multi-locus phylogenetic analyses (ITS, act, rpb2, tef1-α, and tub2 for Cytospora; ITS, cal, his3, tef1-α, and tub2 for Diaporthe). Three new species, Cytospora corylina, C. curvispora, and Diaporthe corylicola, and two known species, Cytospora leucostoma and Diaporthe eres, grew at 5–30°C and a pH of 3.0–11.0, with optimum growth at approximately 25°C and pH 4.0–7.0. Additionally, the effects of six carbon sources on mycelial growth were investigated. This study explored the main pathogenic fungi species of Corylus heterophylla, completed the corresponding database of pathogenic fungi information, and clarified their biological characteristics. Moreover, the results of this study provided a theoretical basis for Corylus heterophylla disease management and prevention in China.

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“…Therefore, we also assessed the biocontrol efficacy of T. hamatum against L. theobromae on potted, three-year-old, macadamia plants. Macadamia trees are susceptible to a variety of fungal pathogens ( Akinsanmi et al, 2016b ; Wrona et al, 2020 ) and insects ( Khun et al, 2021 ), which can result in significant economic losses. Studies on the biocontrol of insect have been significantly more numerous than studies on the biocontrol of plant diseases ( Gutierrez-Coarite et al, 2018 ; Polaszek et al, 2020 ).…”

Section: Resultsmentioning

confidence: 99%

Efficacy of the biocontrol agent Trichoderma hamatum against Lasiodiplodia theobromae on macadamia

Leng

et al. 2022

Front. Microbiol.

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Macadamia (Macadamia integrifolia) trees are an important source of revenue in rainforest ecosystems. Their nuts are rich in vitamins, minerals, fiber, antioxidants, and monounsaturated oils. The fungus Lasiodiplodia theobromae, however, is a major disease problem, causing kernel rot and other disease symptoms. In the present study, a dual confrontation assay was used to evaluate the inhibitory effect of an endophytic strain of Trichoderma hamatum C9 from macadamia root against L. theobromae. Volatiles and cell-free culture filtrate of T. hamatum were also used to assess their antifungal activity against L. theobromae. Results suggested that T. hamatum exhibited a significant inhibitory effect against L. theobromae in vitro. Further results of a biocontrol assay indicated that a spray treatment of T. hamatum conidial suspension significantly decreased the size of lesions caused by artificially inoculated L. theobromae on macadamia leaves, as well as the disease index in young trees inoculated with L. theobromae, relative to sterile water controls. Collectively, our findings indicate that T. hamatum C9 represents a potential biocontrol agent that can be used to manage L. theobromae on macadamia.

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Phomopsis husk rot of macadamia in Australia and South Africa caused by novel Diaporthe species

Abstract: Plant Pathology. 2020;69:911-921. wileyonlinelibrary.com/journal/ppa | 911

Cited by 22 publications

References 35 publications

Endophytic Diaporthe Associated with Morinda officinalis in China

Endophytic Diaporthe Associated with Morinda officinalis in China

Cytospora and Diaporthe Species Associated With Hazelnut Canker and Dieback in Beijing, China

Efficacy of the biocontrol agent Trichoderma hamatum against Lasiodiplodia theobromae on macadamia

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