Cytospora species from Populus and Salix in China with C. davidiana sp. nov.
Poplar and willow plantations have become widespread in China, in order to meet national economic and environmental needs. The emergence of several pathogens is enhanced by climatic change and associated human factors. Species of Cytospora are well-known pathogens on poplar and willow, and cause stem cankers and diebacks. In the present study, we conducted a survey of Cytospora species occurring on Populus spp. and Salix spp. in China. We used morphological examination and phylogenetic inferences, based on the DNA sequence data from the internal transcribed spacer regions (ITS1, 5.8S rDNA, and ITS2) and partial β-tubulin gene, to identify six Cytospora species occurring on poplar and willow. Five of these species belonged to known taxa, viz. Cytospora chrysosperma (asexual state of Valsa sordida), Cytospora translucens (asexual state of Leucostoma translucens), Cytospora fugax (asexual state of Valsa salicina), Cytospora atrocirrhata, and Cytospora kantschavelii. Our study yielded a new species, Cytospora davidiana sp. nov., on poplar. The new species is characterized by typical torsellioid conidiomata. An additional Cytospora sp. 1, which formed a distinct clade in the phylogenetic inferences, remains unnamed; the paucity of available materials prevented phenotypical characterization.
Key Laboratory of Forest Protection, State Forestry Administration, Research Institute of Forest Ecology, Environment and Protection, Chinese Academy of Forestry, Beijing 100091, China; Co-Innovation Center for Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing 210037, Jiangsu, China; School of Horticulture Landscape Architecture, Henan Institute of Science and Technology, Xinxiang 453003, Henan, China. Electronic address: yanliwang0218@yeah.net.
Yan-Li
YL
Wang
Key Laboratory of Forest Protection, State Forestry Administration, Research Institute of Forest Ecology, Environment and Protection, Chinese Academy of Forestry, Beijing 100091, China; Co-Innovation Center for Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing 210037, Jiangsu, China. Electronic address: Luquan@caf.ac.cn.
Quan
Q
Lu
Mycothèque de l'Université catholique de Louvain (MUCL), Earth and Life Institute, Microbiology, Croix du Sud 2 bte L.7.05.06, Louvain-la-Neuve B-1348, Belgium. Electronic address: cony.decock@uclouvain.be.
Cony
C
Decock
Key Laboratory of Forest Protection, State Forestry Administration, Research Institute of Forest Ecology, Environment and Protection, Chinese Academy of Forestry, Beijing 100091, China; Co-Innovation Center for Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing 210037, Jiangsu, China. Electronic address: Liyongxiaxjs@163.com.
Yong-Xia
YX
Li
Key Laboratory of Forest Protection, State Forestry Administration, Research Institute of Forest Ecology, Environment and Protection, Chinese Academy of Forestry, Beijing 100091, China; Co-Innovation Center for Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing 210037, Jiangsu, China. Electronic address: xyzhang@caf.ac.cn.
Xing-Yao
XY
Zhang
D001203:Ascomycota / Q000145:classification / Q000235:genetics / Q000302:isolation & purification*; D002681:China; D004271:DNA, Fungal / Q000235:genetics; D021903:DNA, Ribosomal Spacer / Q000235:genetics; D008969:Molecular Sequence Data; D010802:Phylogeny; D010935:Plant Diseases / Q000382:microbiology*; D032107:Populus / Q000382:microbiology*; D032108:Salix / Q000382:microbiology*
D004271:DNA, Fungal; D021903:DNA, Ribosomal Spacer
Cytospora canker; Phylogenetic species; Species diversity; Taxonomy