Department of Plant and Wildlife Sciences, Brigham Young University, Provo, UT, USA.
US Forest Service Rocky Mountain Research Station, Shrub Science Lab, Provo, UT, USA.
Microbiologyopen. 2021 Jan;10(1):e1155. doi: 10.1002/mbo3.1155.
Cheatgrass (Bromus tectorum L.) is an invasive annual grass (Poaceae) that has colonized large portions of the Intermountain West. Cheatgrass stand failures have been observed throughout the invaded region, the cause of which may be related to the presence of several species of pathogenic fungi in the soil or surface litter. In this metabarcoding study, we compared the fungal communities between sites that have and have not experienced stand failure. Samples were taken from the soil and surface litter near Winnemucca, Nevada, and in Skull Valley, Utah. Our results show distinct fungal communities associated with stand failure based on both geography and sample type. In both the Winnemucca and Skull Valley surface litter, there was an elevated abundance of the endophyte Ramimonilia apicalis in samples that had experienced a stand failure. Winnemucca surface litter stand failure samples had an increased abundance of a potential pathogen in the genus Comoclathris. Skull Valley surface litter stand failure samples had an increased abundance of an undescribed new species in the Rustroemiaceae family which is responsible for the so-called bleach blonde syndrome in cheatgrass, while the soils had an increased abundance of potential pathogens in the genera Olpidium and Monosporascus.
冰草（Bromus tectorum L.）是一种入侵性一年生草本植物（禾本科），已在落矶山脉西部的大部分地区扎根。在整个入侵地区都观察到冰草草丛的失败，其原因可能与土壤或地表枯枝落叶中存在几种致病性真菌有关。在这项宏条形码研究中，我们比较了经历和未经历草丛失败的地点之间的真菌群落。样品取自内华达州温尼马卡和犹他州 Skull Valley 附近的土壤和地表枯枝落叶中。我们的研究结果表明，根据地理位置和样本类型，与草丛失败相关的真菌群落存在明显差异。在 Winnemucca 和 Skull Valley 的地表枯枝落叶中，经历草丛失败的样本中内生真菌 Ramimonilia apicalis 的丰度升高。Winnemucca 地表枯枝落叶草丛失败样本中，有一种潜在病原体 Comoclathris 的丰度增加。Skull Valley 地表枯枝落叶草丛失败样本中，一种 Rustroemiaceae 家族的未描述新物种的丰度增加，该物种是冰草所谓的漂白金发综合征的罪魁祸首，而土壤中则有更多的潜在病原体，如 Olpidium 和 Monosporascus。
