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In China: Phylogeny, Host Range, and Pathogenicity

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In China: Phylogeny, Host Range, and Pathogenicity Persoonia 45, 2020: 101–131 ISSN (Online) 1878-9080 www.ingentaconnect.com/content/nhn/pimj RESEARCH ARTICLE https://doi.org/10.3767/persoonia.2020.45.04 Cryphonectriaceae on Myrtales in China: phylogeny, host range, and pathogenicity W. Wang1,2, G.Q. Li1, Q.L. Liu1, S.F. Chen1,2 Key words Abstract Plantation-grown Eucalyptus (Myrtaceae) and other trees residing in the Myrtales have been widely planted in southern China. These fungal pathogens include species of Cryphonectriaceae that are well-known to cause stem Eucalyptus and branch canker disease on Myrtales trees. During recent disease surveys in southern China, sporocarps with fungal pathogen typical characteristics of Cryphonectriaceae were observed on the surfaces of cankers on the stems and branches host jump of Myrtales trees. In this study, a total of 164 Cryphonectriaceae isolates were identified based on comparisons of Myrtaceae DNA sequences of the partial conserved nuclear large subunit (LSU) ribosomal DNA, internal transcribed spacer new taxa (ITS) regions including the 5.8S gene of the ribosomal DNA operon, two regions of the β-tubulin (tub2/tub1) gene, plantation forestry and the translation elongation factor 1-alpha (tef1) gene region, as well as their morphological characteristics. The results showed that eight species reside in four genera of Cryphonectriaceae occurring on the genera Eucalyptus, Melastoma (Melastomataceae), Psidium (Myrtaceae), Syzygium (Myrtaceae), and Terminalia (Combretaceae) in Myrtales. These fungal species include Chrysoporthe deuterocubensis, Celoporthe syzygii, Cel. eucalypti, Cel. guang­ dongensis, Cel. cerciana, a new genus and two new species, as well as one new species of Aurifilum. These new taxa are hereby described as Parvosmorbus gen. nov., Par. eucalypti sp. nov., Par. guangdongensis sp. nov., and Aurifilum terminali sp. nov. Pathogenicity tests showed that the eight species of Cryphonectriaceae are pathogenic to two Eucalyptus hybrid seedlings, Melastoma sanguineum branches, and Psidium guajava and Syzygium jambos seedlings. The overall data showed that Chr. deuterocubensis is the most aggressive, followed by Par. eucalypti. Significant differences in tolerance were observed between the two tested Eucalyptus hybrid genotypes, suggesting that disease-tolerant genotypes can be selected for disease management in the Eucalyptus industry. Article info Received: 22 June 2019; Accepted: 13 November 2019; Published: 21 January 2020. INTRODUCTION America (Anagnostakis 1987, 1992). Other tree pathogens in the family include the Eucalyptus (Myrtaceae, Myrtales) patho- The Cryphonectriaceae accommodates fungi previously classi- gens Chrysoporthe austroafricana in Africa (Wingfield et al. fied in the Cryphonectria-Endothia complex (Castlebury et al. 1989), Chr. cubensis in South America (Hodges et al. 1976), and 2002, Gryzenhout et al. 2006c), which was established to in- Chr. deuterocubensis in south-eastern Asia (Old et al. 2003), clude Cryphonectria, Endothia and three other genera, namely the pin oak (Quercus palustris) (Fagaceae, Fagales) pathogen Amphilogia, Chrysoporthe, and Rostraureum (Gryzenhout et al. Endothia gyrosa in North America (Stipes & Phipps 1971) and 2006c). Currently, 25 genera have been identified and described an aggressive pathogen of native Rapanea melanophloeos in the Cryphonectriaceae (Cheewangkoon et al. 2009, Gryzen- (Myrsinaceae, Ericales), and Immersiporthe knoxdaviesiana, hout et al. 2009, 2010, Begoude et al. 2010, Vermeulen et al. in South Africa (Chen et al. 2013a). 2011, 2013, Crous et al. 2012a, b, 2015, Chen et al. 2013a, b, Host plants of the Cryphonectriaceae include more than 100 tree 2016, 2018, Crane & Burgess 2013, Beier et al. 2015, Ali et al. species in over 26 families of 16 orders, particularly in the fami- 2018, Ferreira et al. 2019). With the exception of Chrysocrypta, lies Fagaceae, Melastomataceae, and Myrtaceae (Myrtales) Chrysofolia, and Foliocryphia, which were isolated from leaf (Cheewangkoon et al. 2009, Gryzenhout et al. 2009, 2010, spots of eucalypts (Myrtaceae, Myrtales) (Cheewangkoon et Begoude et al. 2010, Vermeulen et al. 2011, 2013, Chen et al. 2009, Crous et al. 2012a, b, 2015, 2019) and healthy leaves al. 2013a, b, 2016, 2018, Crane & Burgess 2013, Beier et al. of Barringtonia acutangula (Lecythidaceae, Ericales) (Suwan- 2015, Ali et al. 2018, Ferreira et al. 2019). In China, seven narach et al. 2016), the other genera were isolated from trees Cryphonectriaceae genera, Aurantiosacculus, Cryphonectria, associated with blight, die-back or canker (Gryzenhout et al. Chrysoporthe, Celoporthe, Corticimorbus, Chrysomorbus and 2009, 2010, Begoude et al. 2010, Vermeulen et al. 2011, 2013, Endothia have been identified from diseased trees. Aurantio­ Chen et al. 2013a, b, 2016, 2018, Crane & Burgess 2013, Beier sacculus castaneae has been isolated from branches and et al. 2015, Ali et al. 2018, Ferreira et al. 2019, Jiang et al. 2019). twigs of Chinese chestnut (Castanea mollissima) (Fagaceae) The Cryphonectriaceae includes a group of fungi that present (Jiang et al. 2019). Species of Cryphonectria were isolated many of the world’s most important pathogens of trees (Gryzen- from trees of Fagaceae, Cryphonectria parasitica has been hout et al. 2006c, 2009), the best known of which is the chestnut isolated from C. mollissima on which it causes canker and die- blight pathogen, Cryphonectria parasitica, in Europe and North back (Fairchild 1913, Shear & Stevens 1913, Jiang et al. 2018, 2019), Cry. japonica is known from cankers on Quercus (Teng 1 State Key Laboratory of Tree Genetics and Breeding (SKLTGB), Chinese 1934, Myburg et al. 2004a, Gryzenhout et al. 2009, Jiang et al. Academy of Forestry (CAF), Haidian District 100091, Beijing, China; 2019), Cry. quercicola and Cry. quercus from diseased stems corresponding author e-mail: [email protected]. 2 China Eucalypt Research Centre (CERC), Chinese Academy of Forestry of Quercus wutaishansea and Q. aliena var. acuteserrata, re- (CAF), ZhanJiang 524022, GuangDong Province, China. spectively (Jiang et al. 2018), Cry. neoparasitica and Endothia © 2020 Naturalis Biodiversity Center & Westerdijk Fungal Biodiversity Institute You are free to share - to copy, distribute and transmit the work, under the following conditions: Attribution: You must attribute the work in the manner specified by the author or licensor (but not in any way that suggests that they endorse you or your use of the work). Non-commercial: You may not use this work for commercial purposes. No derivative works: You may not alter, transform, or build upon this work. For any reuse or distribution, you must make clear to others the license terms of this work, which can be found at http://creativecommons.org/licenses/by-nc-nd/3.0/legalcode. Any of the above conditions can be waived if you get permission from the copyright holder. Nothing in this license impairs or restricts the author’s moral rights. 102 Persoonia – Volume 45, 2020 chinensis from diseased branches of C. mollissima (Jiang et plantations are widely planted, and other Myrtales trees are al. 2019). Species of Chrysoporthe, Celoporthe, Corticimorbus commonly distributed (Table 1). The surveyed trees include and Chrysomorbus isolated in China all originated from trees different Eucalyptus hybrid genotypes in plantations (Fig. 1a–c), in Myrtaceae or Melastomataceae, and include Chr. deutero­ Melastoma shrubs in Eucalyptus plantations (Fig. 2a, g), cubensis, from multiple Eucalyptus hybrid genotypes, and Psidium guajava (Myrtaceae) (Fig. S1a), Syzygium species Syzygium cumini (Myrtaceae) (Chen et al. 2010, Van der Merwe (Fig. S2a, e), and Terminalia neotaliala (Combretaceae) (Fig. et al. 2010); Celoporthe syzygii, from Eucalyptus grandis hybrid, S3a) planted in nurseries and parks. Other Myrtales and areas S. cumini and Melastoma candidum (Melastomataceae) (Chen surveyed included plantation Eucalyptus in GuiGang Region in et al. 2011, Wang et al. 2018); Cel. cerciana, Cel. eucalypti, GuangXi Province, Syzygium samarangense trees in WaiNing and Cel. guangdongensis, from species of Eucalyptus (Chen Region in HaiNan Province, and Melastoma shrubs in the Hong et al. 2011, Wang et al. 2018); Corticimorbus sinomyrti, from Kong Region. The disease symptoms on the Myrtales trees in- Rhodomyrtus tomentosa (Myrtaceae) (Chen et al. 2016) and cluded cankers on the branches, stems, and bases (Fig. 1a–c, f, Chrysomorbus lagerstroemiae from Lagerstroemia speciosa 2b, S1d, S2b, S3a–b, d), lesions and cracks in the bark (Fig. (Lythraceae, Myrtales) (Chen et al. 2018). Inoculation tests 1e, h, S1b, e, S2d, S3c), stem sections proximal to the cankers have shown that all of the species of Cryphonectriaceae from that were largely dying (Fig. 2d, S1c), stems that break readily in Myrtaceae, Melastomataceae, and Lythraceae are pathogenic the wind (Fig. 1d, S2a), tree/shrub death due to canker girdling to their original hosts and to Eucalyptus (Chen et al. 2010, 2011, of stems (Fig. 2h, S1a), and die-back also observed on species 2016, 2018, Wang et al. 2018). of Melastoma and Syzygium (Fig. 2c, S2e). Yellow, orange, or Myrtales plants are widely distributed particularly in tropical and black sporocarps were present on the surface of the infected sub-tropical regions in the world, and seven of the nine families bark (Fig. 1g, 2e–f, i, S1f, S2c, f, S3e–f) and roots (Fig. 2j), of Myrtales are distributed in China, including Alzateaceae, which display the typical morphological characteristics of Combretaceae, Crypteroniaceae, Lythraceae,
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