Abstract
Based on molecular phylogenetic analyses of a multigene matrix of partial nuSSU-ITS-LSU rDNA, cal, his, ms204, rpb1, rpb2, tef1 and tub2 sequences, recent European and Iranian collections of Melanconium pterocaryae from the type host, Pterocarya fraxinifolia, are shown to be distinct from the Japanese Melanconis pterocaryae from Pterocarya rhoifolia, and both are confirmed as closely related members of the recently described genus Juglanconis. Therefore, the new name Juglanconis japonica is proposed for Melanconis pterocaryae. As no type collection could be traced, Melanconium pterocaryae (syn. J. pterocaryae) is neotypified, described and illustrated, and it is recorded for Europe for the first time. During field surveys in natural stands of P. fraxinifolia in Guilan province (Iran), Juglanconis pterocaryae was consistently isolated from tissues affected by branch and trunk cankers, twig dieback and wood necrosis, indicating that it is the causal agent of these diseases. The external and internal symptoms associated with these trunk diseases are described and illustrated.
Highlights
The Diaporthales (Ascomycota, Sordariomycetes) comprise important plant pathogens, but the species diversity and host range of many phytopathologically important lineages are still imperfectly known
In Iran, P. fraxinifolia grows wildly in the three northern provinces Golestan, Guilan and Mazandaran, but in recent years, small populations have been reported in two other western provinces, Lorestan and Ilam (Nabavi et al 2008)
P. fraxinifolia is currently of little economic importance in forestry, it has been planted as an ornamental tree throughout
Summary
The Diaporthales (Ascomycota, Sordariomycetes) comprise important plant pathogens, but the species diversity and host range of many phytopathologically important lineages are still imperfectly known. Substantial progress was made to tackle the species diversity of several diaporthalean lineages involved in plant diseases by the application of multi-gene phylogenies in combination with morphological studies, e.g. in Coniella (Alvarez et al 2016), Cytospora (Lawrence et al 2018), Diaporthe (Guarnaccia et al 2018) and Harknessia (Marin-Felix et al 2019). P. fraxinifolia is currently of little economic importance in forestry, it has been planted as an ornamental tree throughout
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
