Zhang Jingyu, Liu Minghao, Landry N'da Brou Jean, Duan Yaping, Li Xin, Zhou Xingang
Key Laboratory of Biology and Genetic Improvement of Horticultural Crops (Northeast Region), Ministry of Agriculture and Rural Affairs, Northeast Agricultural University, Harbin, China.
Department of Horticulture, Northeast Agricultural University, Harbin, China.
Front Microbiol. 2024 Dec 2;15:1499302. doi: 10.3389/fmicb.2024.1499302. eCollection 2024.
Returning straw can alter the soil microbial community, reduce the occurrence of soilborne diseases, and promote plant growth. In this study, we aimed to evaluate the effects of Ricinus straw on tomato growth and rhizosphere microbial community. We carried out microcosm experiments to investigate the effects of Ricinus straw with different dosages (0, 1, and 3%) on tomato dry biomass and rhizosphere bacterial and fungal communities. The results indicated that the dry biomass of tomato seedlings with 1% addition of Ricinus straw increased by 53.98%. In addition, Ricinus straw also changed the abundance, diversities, and composition of tomato rhizosphere microbial communities. In detail, the addition of 1% Ricinus straw increased the relative abundance of putative beneficial bacteria and fungi in straw decomposition, such as sp., sp., sp., and sp., and decreased the relative abundance of sp. Meanwhile, Ricinus straw inhibited the growth of putative pathogenic microorganisms. The correlation analysis showed that the changes in fungal community operational taxonomic units stimulated by the addition of Ricinus straw may play a crucial positive regulatory role in tomato growth. Finally, the representative fungal strain sp. (FOL), named TF25, was isolated and cultured. We found that Ricinus straw extract inhibited the growth of TF25 in an experiment with an inhibition rate of 34.95-51.91%. Collectively, Ricinus straw promoted plant growth by changing the rhizosphere microbial community composition and inhibiting FOL growth, which provides new evidence for understanding the improvement of key microorganism composition in improving crop growth and the sustainability of agriculture.
秸秆还田可以改变土壤微生物群落，减少土传病害的发生，并促进植物生长。在本研究中，我们旨在评估蓖麻秸秆对番茄生长和根际微生物群落的影响。我们进行了微观实验，研究不同剂量（0%、1%和3%）的蓖麻秸秆对番茄干生物量以及根际细菌和真菌群落的影响。结果表明，添加1%蓖麻秸秆的番茄幼苗干生物量增加了53.98%。此外，蓖麻秸秆还改变了番茄根际微生物群落的丰度、多样性和组成。具体而言，添加1%蓖麻秸秆增加了秸秆分解过程中假定有益细菌和真菌的相对丰度，如 属、 属、 属和 属，同时降低了 属的相对丰度。同时，蓖麻秸秆抑制了假定致病微生物的生长。相关性分析表明，添加蓖麻秸秆刺激的真菌群落操作分类单元的变化可能在番茄生长中发挥关键的正向调节作用。最后，分离并培养了代表性真菌菌株 （FOL），命名为TF25。我们发现，在实验中蓖麻秸秆提取物抑制了TF25的生长，抑制率为34.95 - 51.91%。总体而言，蓖麻秸秆通过改变根际微生物群落组成和抑制FOL生长促进了植物生长，这为理解改善关键微生物组成对作物生长和农业可持续性的促进作用提供了新的证据。
