Jiangsu Provincial Key Lab of Solid Organic Waste Utilization, Jiangsu Collaborative Innovation Center of Solid Organic Wastes, Educational Ministry Engineering Center of Resource-saving fertilizers, Laboratory of Bio-interactions and Crop Health, Nanjing Agricultural University, Nanjing, 210095, Jiangsu, P. R. China.
The Sanya Institute of Nanjing Agricultural University, Sanya, 572000, Hainan, P. R. China.
NPJ Biofilms Microbiomes. 2023 Jul 5;9(1):46. doi: 10.1038/s41522-023-00416-1.
The soil microbiota is critical to plant performance. Improving the ability of plant-associated soil probiotics is thus essential for establishing dependable and sustainable crop yields. Although fertilizer applications may provide an effective way of steering soil microbes, it is still unknown how the positive effects of soil-borne probiotics can be maximized and how their effects are mediated. This work aims to seek the ecological mechanisms involved in cabbage growth using bio-organic fertilizers. We conducted a long-term field experiment in which we amended soil with non-sterilized organic or sterilized organic fertilizer either containing Trichoderma guizhouense NJAU4742 or lacking this inoculum and tracked cabbage plant growth and the soil fungal community. Trichoderma-amended bio-organic fertilizers significantly increased cabbage plant biomass and this effect was attributed to changes in the resident fungal community composition, including an increase in the relative abundance and number of indigenous soil growth-promoting fungal taxa. We specifically highlight the fundamental role of the biodiversity and population density of these plant-beneficial fungal taxa in improving plant growth. Together, our results suggest that the beneficial effects of bio-organic fertilizer seem to be a combination of the biological inoculum within the organic amendment as well as the indirect promotion through effects on the diversity and composition of the soil resident plant-beneficial fungal microbiome.
土壤微生物群落对植物的生长发育至关重要。因此，提高植物根际促生菌的功能对于建立可靠和可持续的作物产量至关重要。尽管肥料的施加可能是一种有效的方法来引导土壤微生物，但目前仍不清楚如何最大限度地提高土壤来源的促生菌的积极作用，以及它们的作用是如何介导的。本研究旨在利用生物有机肥料寻找与甘蓝生长相关的生态机制。我们进行了一项长期的田间试验，用未灭菌的有机肥料或灭菌的有机肥料处理土壤，其中含有或不含有该接种物，并跟踪甘蓝植物的生长和土壤真菌群落。添加木霉的生物有机肥料显著增加了甘蓝植物的生物量，这一效果归因于定殖真菌群落组成的变化，包括土著土壤促生真菌类群的相对丰度和数量增加。我们特别强调了这些植物有益真菌类群的生物多样性和种群密度在提高植物生长方面的基本作用。总之，我们的研究结果表明，生物有机肥料的有益效果似乎是有机肥料中生物接种体与通过对土壤定殖植物有益真菌微生物组的多样性和组成的间接促进作用的结合。
