Publication Date:
2024-04-28
Description:
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
and branch canker disease on Myrtales trees. During recent disease surveys in southern China, sporocarps with
typical characteristics of Cryphonectriaceae were observed on the surfaces of cankers on the stems and branches
of Myrtales trees. In this study, a total of 164 Cryphonectriaceae isolates were identified based on comparisons of
DNA sequences of the partial conserved nuclear large subunit (LSU) ribosomal DNA, internal transcribed spacer
(ITS) regions including the 5.8S gene of the ribosomal DNA operon, two regions of the β-tubulin (tub2/tub1) gene,
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. guangdongensis, 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.
Keywords:
Ecology
;
Evolution
;
Behavior and Systematics
;
Eucalyptus
;
fungal pathogen
;
host jump
;
Myrtaceae
;
new taxa
;
plantation forestry
Repository Name:
National Museum of Natural History, Netherlands
Type:
info:eu-repo/semantics/article
Format:
application/pdf
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