Cytospora species associated with walnut canker disease in China, with description of a new species C. gigalocus.
Cytospora species associated with canker disease are presently difficult to identify because of lack of ex-types cultures with molecular data, few distinguishable characters, and only Internal transcribed spacer (ITS) sequence data is available for most Cytospora strains in GenBank. We report on Cytospora species from the walnut tree in China. Collections were subjected to morphological and phylogenetic study. The relatedness of species associated with walnut canker were established using combined ITS, nrLSU, β-tubulin, and actin gene sequence data. Cytospora atrocirrhata, Cytospora chrysosperma, Cytospora sacculus, and a new species, Cytospora gigalocus, were identified causing canker disease of walnut. Cytospora gigalocus is formally described and compared with most similar species. Cytospora chrysosperma and C. sacculus have previously been recorded from walnut, whereas C. atrocirrhata is reported as associated with walnut canker for the first time. This is the first study that has established the Cytospora species causing walnut canker in China using a multi-phasic approach. All species are recorded as being associated with walnut canker disease in China for the first time.
The Key Laboratory for Silviculture and Conservation of Ministry of Education, Beijing Forestry University, Beijing 100083, China.
Xinlei
X
Fan
International Fungal Research & Development Centre, The Research Institute of Resource Insects, Chinese Academy of Forestry, Bailongsi, Kunming 650224, China; School of Science, Mae Fah Luang University, Chaing Rai 57100, Thailand.
Kevin D
KD
Hyde
The Key Laboratory for Silviculture and Conservation of Ministry of Education, Beijing Forestry University, Beijing 100083, China.
Min
M
Liu
Museum of Beijing Forestry University, Beijing 100083, China.
Yingmei
Y
Liang
The Key Laboratory for Silviculture and Conservation of Ministry of Education, Beijing Forestry University, Beijing 100083, China. Electronic address: chengmt@bjfu.edu.cn.
Chengming
C
Tian
D001203:Ascomycota / Q000145:classification* / Q000235:genetics / Q000302:isolation & purification*; D044822:Biodiversity; D002681:China; D005656:Fungal Proteins / Q000235:genetics; D031324:Juglans / Q000382:microbiology*; D008969:Molecular Sequence Data; D010802:Phylogeny; D010935:Plant Diseases / Q000382:microbiology*; D014404:Tubulin / Q000235:genetics
D005656:Fungal Proteins; D014404:Tubulin
Juglans regia; Morphology; Pathogen; Phylogeny; Taxonomy