■木霉属物种通过寄生和共生机制与植物建立共生关系。虽然一些木霉属物种作为植物病原真菌,其他人利用各种策略来保护和促进植物生长。
■木霉属新物种的系统发育位置是通过依赖于核糖体DNA的内部转录间隔区(ITS)区域的多基因分析确定的,翻译延伸因子1-α(tef1-α)基因,和RNA聚合酶II(rpb2)基因。此外,进行了致病性实验,并根据感染部位的横截面面积评估每个分离株的侵袭性。
■在这项研究中,13种木霉属,包括9个已知物种和4个新物种,即,T.delicatum,T.罗布图姆,T.perfasculatum,从云南天麻病块茎中分离出地下T。中国。在已知的物种中,T.hamatum的频率最高。T.delicatum属于Koningii进化枝。robustum和perfasciculatum被分配到Virens进化枝。T.Subulatum成为Spirale进化枝的新成员。对新物种T.robustum进行了致病性实验,T.delicatum,和T.perfasculatum,以及已知的T.hamatum物种,T.atroviride,还有T.harzianum.不同木霉属物种对白斑的感染能力不同,表明木霉是G.elata黑腐病的病原真菌。
■这项研究提供了新物种的形态特征,并讨论了与系统发育邻近物种的形态差异,为旨在预防和管理影响G.elata的疾病的研究奠定基础。
UNASSIGNED: Trichoderma species establish symbiotic relationships with plants through both parasitic and mutualistic mechanisms. While some Trichoderma species act as plant pathogenic fungi, others utilize various strategies to protect and enhance plant growth.
UNASSIGNED: Phylogenetic positions of new species of Trichoderma were determined through multi-gene analysis relying on the internal transcribed spacer (ITS) regions of the ribosomal DNA, the translation elongation factor 1-α (tef1-α) gene, and the RNA polymerase II (rpb2) gene. Additionally, pathogenicity experiments were conducted, and the aggressiveness of each isolate was evaluated based on the area of the cross-section of the infected site.
UNASSIGNED: In this study, 13 Trichoderma species, including 9 known species and 4 new species, namely, T. delicatum, T. robustum, T. perfasciculatum, and T. subulatum were isolated from the diseased tubers of Gastrodia elata in Yunnan,
China. Among the known species, T. hamatum had the highest frequency. T. delicatum belonged to the Koningii clade. T. robustum and T. perfasciculatum were assigned to the Virens clade. T. subulatum emerged as a new member of the Spirale clade. Pathogenicity experiments were conducted on the new species T. robustum, T. delicatum, and T. perfasciculatum, as well as the known species T. hamatum, T. atroviride, and T. harzianum. The infective abilities of different Trichoderma species on G. elata varied, indicating that Trichoderma was a pathogenic fungus causing black rot disease in G. elata.
UNASSIGNED: This study provided the morphological characteristics of new species and discussed the morphological differences with phylogenetically proximate species, laying the foundation for research aimed at preventing and managing diseases that affect G. elata.