Taxonomy of two synnematal fungal species from Rhus chinensis, with Flavignomonia gen. nov. described.

Ning Jiang,Chengming Tian,Qin Yang,Ying-Mei Liang

doi:10.3897/mycokeys.60.46395

Abstract

Rhus chinensis represents a commercially and ecologically important tree species in China, but suffers from canker diseases in Jiangxi Province. Synnemata, pycnidia and ascomata were discovered on cankered tissues. Strains were obtained from single ascospore or conidium within the fruiting bodies and identified based on morphological comparison and the phylogenetic analyses of partial ITS, LSU, tef1 and rpb2 gene sequences. As a result, two species were confirmed to represent two kinds of synnemata. One of these species is described herein as Flavignomonia rhoigenagen. et sp. nov.; and Synnemasporella aculeans is illustrated showing ascomata, pycnidia and synnemata. Flavignomonia is distinguished from Synnemasporella by the colour of the synnematal tips. Additionally, Flavignomonia can be distinguished from the other gnomoniaceous genera by the formation of synnemata.

Highlights

IntroductionMany Diaporthales species are important branch canker pathogens, forming acervuli or pycnidia on diseased tissues (Rossman et al 2007, Senanayake et al 2017, Jiang et al 2018, 2019, Wijayawardene et al 2018, Yang et al 2018, Voglmayr et al 2019)
The phylogram based on the four gene sequence matrix indicated that the three strains from the present study represent a novel genus in Gnomoniaceae
Two diaporthalean species forming synnemata on Rhus chinensis were identified based on morphology and ITS, LSU, tef1, and rpb2 sequence datasets

Summary

Introduction

Many Diaporthales species are important branch canker pathogens, forming acervuli or pycnidia on diseased tissues (Rossman et al 2007, Senanayake et al 2017, Jiang et al 2018, 2019, Wijayawardene et al 2018, Yang et al 2018, Voglmayr et al 2019). Cryptodiaporthe aculeans) and S. toxicodendri (Fan et al 2018) These two species differ from the other diaporthalean taxa in conidiomata and form a distinct clade phylogenetically, which was named Synnemasporellaceae and distinguished by Fan et al (2018). Species in Gnomoniaceae formed upright perithecia, with or without long or short necks and presence or absence of stromatic tissues (Barr 1978, Sogonov et al 2008, Walker et al 2012). Neognomoniopsis and Tenuignomonia were added based on both molecular and morphological evidence (Crous et al 2019, Minoshima et al 2019)

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