Engineering Research Center of Chinese Ministry of Education for Edible and Medicinal Fungi, Jilin Agricultural University, Changchun, 130118, P. R. China.
Department of Biological Sciences, University of Arkansas, Fayetteville, AR, 72701, USA.
Sci Rep. 2019 Jan 9;9(1):5. doi: 10.1038/s41598-018-37896-7.
Dictyostelid cellular slime molds (dictyostelids) are key components of soil microbes. The Qinghai-Tibet Plateau is characterized by unique and important forest types because of the considerable range in elevation which exists. During the period of 2012, 2013 and 2016, 12 species of dictyostelids were yielded from samples collected in this region, including two new species and three new records for China. Six other species were new records for this region. Ontogeny, morphology, ultrastructure and systematic molecular analyses (SSU & ITS) of D. minimum and D. multiforme confirm that they are Goup 4 new species. The ornamentation of the surface of dictyostelids' spores is the first time to be observed until now. In the SSU phylogenetic tree generated in the present study, Synstelium, not assigned to order and family before, was assigned to the clade Acytosteliaceae in the Acytosteliales firstly. To our knowledge, the study reported herein is the first investigation of dictyostelid biodiversity carried out at elevations above 2000 m. Sorocarp size, sorus size, spore length, ratio of sorus and sorophore, and ratio of sorus and spore size were positively correlated with increasing elevation and no linear correlated with forest type, according to the results of linear regression analysis.
粘菌细胞（粘菌）是土壤微生物的重要组成部分。青藏高原由于海拔范围较大，具有独特而重要的森林类型。在 2012 年、2013 年和 2016 年期间，从该地区采集的样本中产生了 12 种粘菌，包括两种新种和三种中国新记录种。另外六种是该地区的新记录种。D. minimum 和 D. multiforme 的个体发生、形态、超微结构和系统分子分析（SSU 和 ITS）证实它们是第 4 组新种。粘菌孢子表面的装饰是迄今为止首次观察到的。在所研究的 SSU 系统发育树中，Synstelium 之前未被分配到目和科，现在被分配到 Acytosteliales 中的 Acytosteliaceae 分支。据我们所知，本研究是首次在海拔 2000 米以上地区对粘菌生物多样性进行的调查。根据线性回归分析的结果，子实体大小、子实体大小、孢子长度、子实体与子柄的比例以及子实体与孢子大小的比例与海拔的升高呈正相关，与森林类型没有线性相关。
