蛹虫草会感染昆虫,并在昆虫残骸中形成菌核,建立昆虫-微生物复合物。这里,对来自中国一个地点的5年时间内的C.memo菌核样品进行高通量DNA测序,并鉴定了核心微生物(在5年内稳定富集在菌核中)。接下来,从C.melaris菌核中分离出7株细菌,他们的生化特征进行了评估,并将它们与C.milaris共培养,以研究它们对C.milaris代谢产物产生和生物量的影响。此外,比较了NH4,NO3和蛋白ept培养基对c。结果表明,红球菌,Phyllobacterium,假单胞菌,无色杆菌属,Ensifer,窄食单胞菌,鞘杆菌属,Variovorax,不动杆菌是核心微生物。尽管与从菌核中分离出的7种细菌菌株共培养不会直接增加虫草素水平,它们都有还原NO3的能力,四个具有尿素分解能力。同时,与其他两种培养基中的蛹虫草相比,NH4培养基中的蛹虫草素水平增加。由此,我们推断菌核中的细菌可以将NO3转化为NH4,然后使用NH4产生虫草素,这通过RNA-seq和实时荧光定量PCR得到证实。因此,菌核中的细菌可能通过调节氮代谢间接影响蛹虫草代谢产物的产生。总之,有稳定的核心微生物,并且它们可能直接和间接地影响蛹虫草的生长和代谢产物的产生。
目的:冬虫夏草模型种蛹虫草富含治疗性化合物。最近已经证明菌核中的共生微生物影响冬虫夏草的生长,发展,和次级代谢产物的产生。在这项研究中,核心微生物是根据从同一地点获得的5年以上的C.melaris菌核样品鉴定的。此外,从C.melaris菌核分离的细菌菌株被发现影响代谢物的生产和氮的利用,基于功能测试。此外,基于菌核中的细菌氮代谢能力及其对蛹虫草代谢产物产生的影响,我们推测菌核中的细菌可以通过调节氮代谢来间接影响蛹虫草代谢产物的产生。这是关于菌核中的细菌如何从氮循环的角度影响c.memasis代谢物产生的第一份报告。该结果增加了我们对C.memasis菌核中微生物功能的理解。
Cordyceps militaris infects insects and forms sclerotia within the insect remains, establishing insect-microbe complexes. Here, C. militaris sclerotia samples from a single location in China over a 5-year period were subjected to high-throughput DNA sequencing, and the core microbes (which were stably enriched in the sclerotia over the 5 years) were identified. Next, seven bacterial strains were isolated from the C. militaris sclerotia, their biochemical characteristics were assessed, and they were co-cultured with C. militaris to study their effects on C. militaris metabolite production and biomass. Furthermore, the effects of NH4, NO3, and peptone media on C. militaris were compared. The results showed that Rhodococcus, Phyllobacterium, Pseudomonas, Achromobacter, Ensifer, Stenotrophomonas, Sphingobacterium, Variovorax, and Acinetobacter were the core microbes. Although co-culture of C. militaris with the seven bacterial strains isolated from the sclerotia did not directly increase the
cordycepin level, they all had NO3 reduction ability, and four had urea decomposition ability. Meanwhile, C. militaris in NH4 medium had an increased
cordycepin level compared to C. militaris in the other two media. From this, we inferred that bacteria in the sclerotia can convert NO3 to NH4, and then
cordycepin is produced using NH4, which was confirmed by RNA-seq and real-time fluorescence quantitative PCR. Thus, bacteria in the sclerotia may indirectly affect the C. militaris metabolite production by regulating nitrogen metabolism. In summary, there are stable core microbes in the C. militaris sclerotia, and they may directly and indirectly affect the growth and metabolite production of C. militaris.
OBJECTIVE: The model Cordyceps species Cordyceps militaris is rich in therapeutic compounds. It has recently been demonstrated that symbiotic microbes in sclerotia affect Cordyceps\' growth, development, and secondary metabolite production. In this study, core microbes were identified based on C. militaris sclerotia samples obtained from the same site over 5 years. Additionally, bacterial strains isolated from C. militaris sclerotia were found to affect metabolite production and nitrogen utilization, based on functional tests. Moreover, based on the bacterial nitrogen metabolism capacity in the sclerotia and its influence on C. militaris metabolite production, we deduced that bacteria in the sclerotia can indirectly affect C. militaris metabolite production by regulating nitrogen metabolism. This is the first report on how bacteria in the sclerotia affect C. militaris metabolite production from the perspective of the nitrogen cycle. The results increase our understanding of microbial functions in C. militaris sclerotia.