Mahnert Alexander, Haratani Marika, Schmuck Maria, Berg Gabriele
Institute of Environmental Biotechnology, Graz University of Technology, Graz, Austria.
Front Microbiol. 2018 Dec 5;9:2985. doi: 10.3389/fmicb.2018.02985. eCollection 2018.
Microbial diversity is suggested as the key for plant and human health. However, how microbial diversity can be enriched is largely unknown but of great interest for health issues. Biostimulants offer the way to directly augment our main living areas by the healthy microbiome of indoor plants. Here, we investigated shifts of the microbiome on leaves of spider plants () and its surrounding abiotic surfaces in the built environment after irrigation with a vermicompost-based biostimulant for 12 weeks. The biostimulant could not only promote plant growth, but changed the composition of the microbiome and abundance of intact microbial cells on plant leaves and even stronger on abiotic surfaces in close vicinity under constant conditions of the microclimate. Biostimulant treatments stabilized microbial diversity and resulted in an increase of and a surprising transient emerge of new phyla, e.g., , and The proportion of potentially beneficial microorganisms like increased relatively; microbial diversity was stabilized, and the built environment became more plant-like. Detected metabolites like indole-3-acetic acid in the biostimulant were potentially contributed by species of . Overall, effects of the biostimulant on the composition of the microbiome could be predicted with an accuracy of 87%. This study shows the potential of biostimulants not only for the plant itself, but also for other living holobionts like humans in the surrounding environment.
微生物多样性被认为是植物和人类健康的关键。然而，如何丰富微生物多样性在很大程度上尚不清楚，但对于健康问题却极具研究价值。生物刺激剂为通过室内植物的健康微生物群直接改善我们的主要生活区域提供了途径。在此，我们研究了在用基于蚯蚓堆肥的生物刺激剂灌溉12周后，室内环境中吊兰叶片及其周围非生物表面微生物群落的变化。这种生物刺激剂不仅能促进植物生长，还能改变植物叶片上微生物群落的组成以及完整微生物细胞的丰度，在小气候恒定条件下，对紧邻的非生物表面的影响甚至更强。生物刺激剂处理稳定了微生物多样性，导致[具体微生物名称1]增加，并且出现了新的门，如[具体门名称1]、[具体门名称2]和[具体门名称3]等令人惊讶的短暂出现；像[具体有益微生物名称]这样潜在有益微生物的比例相对增加；微生物多样性得以稳定，室内环境变得更像植物环境。在生物刺激剂中检测到的如吲哚 - 3 - 乙酸等代谢产物可能是由[具体微生物种类]产生的。总体而言，生物刺激剂对微生物群落组成的影响预测准确率可达87%。这项研究表明生物刺激剂不仅对植物本身具有潜力，对周围环境中的其他生物共生体如人类也具有潜力。
