Santoyo Gustavo, Urtis-Flores Carlos Alberto, Loeza-Lara Pedro Damián, Orozco-Mosqueda Ma Del Carmen, Glick Bernard R
Instituto de Investigaciones Químico-Biológicas, Universidad Michoacana de San Nicolás de Hidalgo, Morelia 58030, Mexico.
Licenciatura en Genómica Alimentaria, Universidad de La Ciénega del Estado de Michoacán de Ocampo, Sahuayo 59103, Mexico.
Biology (Basel). 2021 May 27;10(6):475. doi: 10.3390/biology10060475.
The application of plant growth-promoting rhizobacteria (PGPR) in the field has been hampered by a number of gaps in the knowledge of the mechanisms that improve plant growth, health, and production. These gaps include (i) the ability of PGPR to colonize the rhizosphere of plants and (ii) the ability of bacterial strains to thrive under different environmental conditions. In this review, different strategies of PGPR to colonize the rhizosphere of host plants are summarized and the advantages of having highly competitive strains are discussed. Some mechanisms exhibited by PGPR to colonize the rhizosphere include recognition of chemical signals and nutrients from root exudates, antioxidant activities, biofilm production, bacterial motility, as well as efficient evasion and suppression of the plant immune system. Moreover, many PGPR contain secretion systems and produce antimicrobial compounds, such as antibiotics, volatile organic compounds, and lytic enzymes that enable them to restrict the growth of potentially phytopathogenic microorganisms. Finally, the ability of PGPR to compete and successfully colonize the rhizosphere should be considered in the development and application of bioinoculants.
植物促生根际细菌（PGPR）在田间的应用受到了一些知识空白的阻碍，这些知识空白涉及改善植物生长、健康和产量的机制。这些空白包括：（i）PGPR定殖于植物根际的能力；（ii）细菌菌株在不同环境条件下生长的能力。在本综述中，总结了PGPR定殖于宿主植物根际的不同策略，并讨论了拥有高竞争力菌株的优势。PGPR定殖于根际所表现出的一些机制包括识别来自根系分泌物的化学信号和养分、抗氧化活性、生物膜形成、细菌运动性，以及有效逃避和抑制植物免疫系统。此外，许多PGPR含有分泌系统并产生抗菌化合物，如抗生素、挥发性有机化合物和裂解酶，使它们能够限制潜在植物病原微生物的生长。最后，在生物接种剂的开发和应用中应考虑PGPR竞争并成功定殖于根际的能力。
