A new genus of Cryphonectriaceae isolated from Lagerstroemia speciosa in southern China

Abstract

Numerous species in the Cryphonectriaceae have been recorded on the Myrtales and many of these are economically important pathogens of Eucalyptus. Some species have also recently been shown to be endophytes of native Myrtaceae and to have undergone host jumps to infect Eucalyptus species established as exotics in plantations. Recent surveys in the GuangDong and HaiNan Provinces of South China reveal the presence of a species of Cryphonectriaceae associated with cankers on trees of Lagerstroemia speciosa (Lythraceae, Myrtales). Fungal structures were observed on the surface of dead bark covering cankers and on branch stubs. Multigene phylogenetic analyses were conducted based on DNA sequence comparisons of the partial LSU gene, ITS region of the nuclear ribosomal RNA gene and two regions of the b-tubulin (BT) gene. The results revealed the presence of a previously undescribed genus and species in the Cryphonectriaceae. The fungus is described here as Chrysomorbus lagerstroemiae gen. et sp. nov. Inoculation tests showed that it is an aggressive pathogen on L. speciosa and that it can also infect Eucalyptus.

Novel Cryphonectriaceae from La Réunion and South Africa, and their pathogenicity on Eucalyptus

“…Isolates from this study were compared to published sequences of type species of the Cryphonectriaceae (Table 1). The generic relationships in the Cryphonectriaceae were analysed with a concatenated dataset of LSU, ITS and BT (including partial exon 4 and 5, partial exons 6 and 7) sequences with taxa selected from ex-types of described genera in the Cryphonectriaceae (Begoude et al 2010;Chen et al 2013aChen et al , 2016Chen et al , 2017Crane and Burgess 2013). The relationships between species were revealed in analyses of concatenated ITS and BT genes.…”

“…Characteristics of specimens were compared with those published for closely related species in the Cryphonectriaceae (Begoude et al 2010;Chen et al 2016Chen et al , 2017Gryzenhout et al 2009;Vermeulen et al 2011).…”

Identification of phytopathogens from a taxonomic view, an example of Cryphonectriaceae

“…Cryphonectriaceae was not obvious, the same as genera. Chrysomorbus is classified in Cryphonectriaceae and proposed as a novel genus supported by DNA sequence data (Chen et al, 2018).…”

Identification and pathogenicity of Cryphonectriaceae species associated with chestnut canker in China

“…DNA sequence evidence demonstrated this genus to be a member of the Cryphonectriaceae (Crous et al ., ). Chrysomorbus was newly described based only on asexual states from Lagerstroemia speciosa (Chen et al ., ). Species differentiation of asexual states in the Cryphonectriaceae based on morphology is not easy because of the few differences between the asexual states.…”

“…Species differentiation of asexual states in the Cryphonectriaceae based on morphology is not easy because of the few differences between the asexual states. However, Chrysomorbus was attributed to the Cryphonectriaceae and its difference from the other genera is supported by phylogenetics (Chen et al ., ).…”