Wang Changxi, Song Weichen, Li Chunyu, Cao Yiran, Li Xichen, Zhao Jing, Yang Fei, Yu Haiyi, Liang Qiang, Yang Ke Qiang, Liu Jian Ning, Fang Hongcheng
College of Forestry, Shandong Agricultural University, Taian, 271018, China.
State Forestry and Grassland Administration Key Laboratory of Silviculture in the Downstream Areas of the Yellow River, Shandong Agricultural University, Taian, 271018, China.
BMC Plant Biol. 2025 Jul 2;25(1):839. doi: 10.1186/s12870-025-06812-3.
Rhizosphere microorganisms can improve soil quality, promote plant growth, and enhance plant health. Despite the isolation of numerous plant growth-promoting rhizobacteria (PGPR) strains, research on how PGPR enhances walnut growth remains limited.
In this study, the metagenomic sequencing of the rhizosphere soil in 8 major walnut-producing areas in China was conducted to identify 150 shared core amplicon sequence variants. Then, we isolated a strain of Bacillus cereus OTU8977 from the walnut rhizosphere soil and evaluated its potential plant growth-promoting functions. B. cereus OTU8977 can optimize the walnut rhizosphere microecology and promote its growth through its considerable potential in nitrogen fixation, phosphorus solubilization, and potassium dissolution. Transcriptomic analysis of walnut roots revealed that B. cereus OTU8977 promotes the growth of walnuts by enhancing phenylpropanoid biosynthesis and carbohydrate metabolic processes.
This study identified a strain of Bacillus cereus with multiple plant growth-promoting functions, which significantly enhanced walnut growth. Moreover, the study further elucidated the mechanisms underlying its growth-promoting effects, providing a theoretical foundation for the development of walnut-specific microbial fertilizers.
根际微生物可以改善土壤质量、促进植物生长并增强植物健康。尽管已分离出众多促进植物生长的根际细菌（PGPR）菌株，但关于PGPR如何促进核桃生长的研究仍然有限。
在本研究中，对中国8个主要核桃产区的根际土壤进行了宏基因组测序，以鉴定150个共享的核心扩增子序列变体。然后，我们从核桃根际土壤中分离出一株蜡样芽孢杆菌OTU8977，并评估了其潜在的促进植物生长功能。蜡样芽孢杆菌OTU8977通过其在固氮、解磷和溶钾方面的巨大潜力，可以优化核桃根际微生态并促进其生长。对核桃根的转录组分析表明，蜡样芽孢杆菌OTU8977通过增强苯丙烷类生物合成和碳水化合物代谢过程来促进核桃生长。
本研究鉴定出一株具有多种促进植物生长功能的蜡样芽孢杆菌，其显著促进了核桃生长。此外，该研究进一步阐明了其促进生长作用的潜在机制，为开发核桃专用微生物肥料提供了理论基础。
