Abstract
Species of Colletotrichum are commonly found in many plant hosts as pathogens, endophytes and occasionally saprobes. Twenty-two Colletotrichum strains were isolated from three Dendrobium species – D.cariniferum, D.catenatum and D.harveyanum, as well as three unidentified species. The taxa were identified using morphological characterisation and phylogenetic analyses of ITS, GAPDH, ACT and ß–tubulin sequence data. This is the first time to identify endophytic fungi from Dendrobium orchids using the above method. The known species, Colletotrichumboninense, C.camelliae-japonicae, C.fructicola, C.jiangxiense and C.orchidophilum were identified as fungal endophytes of Dendrobium spp., along with the new species, C.cariniferi, C.chiangraiense, C.doitungense, C.parallelophorum and C.watphraense, which are introduced in this paper. One strain is recorded as an unidentified species. Corn meal agar is recommended as a good sporulation medium for Colletotrichum species. This is the first report of fungal endophytes associated with Dendrobiumcariniferum and D.harveyanum. Colletotrichumcamelliae-japonicae, C.jiangxiense, and C.orchidophilum are new host records for Thailand.
Highlights
Colletotrichum is the sole genus in family Glomerellaceae (Glomerellales) (Maharachchikumbura et al 2015, 2016; Jayawardena et al 2016b; Hongsanan et al 2017)
We investigated the diversity of endophytic Colletotrichum in five Dendrobium orchid species collected from a mountain close to the Thailand-Myanmar border and D. catenatum collected from Guizhou Province in China
The highest number of Colletotrichum strains and species were isolated from Dendrobium sp.1 followed by Dendrobium sp
Summary
Colletotrichum is the sole genus in family Glomerellaceae (Glomerellales) (Maharachchikumbura et al 2015, 2016; Jayawardena et al 2016b; Hongsanan et al 2017). Colletotrichum species has been listed as one of the top ten fungal pathogenic genera in molecular plant pathology based on scientific/economic importance (Dean et al 2012). Anthracnose caused by Colletotrichum species can be a devastating disease in many economically important crops, including fruit crops, vegetables, cassava, sorghum, as well as ornamental plant such as orchids (Prusky and Plumbley 1992; Hyde et al 2009a, b; Cannon et al 2012; Dean et al 2012; Jadrane et al 2012; Jayawardena et al 2016a; Diao et al 2017). Even though the diversity of Colletotrichum species associated with cultivated plant hosts have extensively been studied (Yang et al 2009), a very limited number of studies has been conducted on Colletotrichum species from non-cultivated plants in natural and semi-natural habitats (Cannon et al 2012)
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