Institute for Advanced Materials, Lingnan Normal University, Zhanjiang 524048, China.
School of Life Science and Technology, Lingnan Normal University, Zhanjiang 524048, China.
Plant Dis. 2020 Jun;104(6):1744-1750. doi: 10.1094/PDIS-10-19-2183-RE. Epub 2020 Apr 14.
Carpetgrass () is a creeping, stoloniferous, perennial warm-season grass that is adapted to humid tropical and subtropical climates. Recently, outbreaks of anthracnose disease of caused by an unidentified sp. were observed in the Hainan and Guangdong provinces in southern China. In late winter and early spring, the disease incidence reached 100% in some badly infected lawns. Under high-moisture conditions, the crowns and oldest leaf sheaths of the majority of the plants became necrotic, which led to whole lawns turning reddish brown. Pathogenicity was confirmed by inoculating uninfected plants with a conidial suspension of the sp. isolated from diseased plants. Phylogenetic analyses of the combined internal transcribed spacer, , , and sequences revealed the pathogen to be a novel species of the species complex. Microscopic examination showed that the species was also morphologically distinct from related species. As a result of the phylogenetic, morphological, and pathogenicity analyses, we propose the name for this pathogen of in southern China.
地毯草（Axonopus compressus）是一种匍匐、根茎丛生的多年生暖季型禾草，适应于潮湿的热带和亚热带气候。最近，在中国南方的海南省和广东省观察到由一种未鉴定的 Colletotrichum 种引起的地毯草炭疽病暴发。在冬末和早春，一些受严重感染的草坪的发病率达到了 100%。在高湿度条件下，大多数植物的冠部和最老的叶鞘坏死，导致整个草坪变成红棕色。通过用从病株上分离出的 Colletotrichum 种的分生孢子悬浮液接种未感染的地毯草植物，确认了致病性。对内部转录间隔区（ITS）、5.8S、大亚基（LSU）和翻译延伸因子 1-α（TEF1-α）的联合序列的系统发育分析表明，该病原菌是 种复合体的一个新种。显微镜检查表明，该种在形态上也与相关的 Colletotrichum 种明显不同。基于系统发育、形态学和致病性分析，我们建议将该病原菌命名为 Colletotrichum sp. ，其为中国南方的地毯草炭疽病病原菌。
