Mashabela Manamele D, Piater Lizelle A, Dubery Ian A, Tugizimana Fidele, Mhlongo Msizi I
Research Centre for Plant Metabolomics, Department of Biochemistry, University of Johannesburg, P.O. Box 524, Auckland Park, Johannesburg 2006, South Africa.
International Research and Development Division, Omnia Group, Ltd., Johannesburg 2021, South Africa.
Biology (Basel). 2022 Feb 22;11(3):346. doi: 10.3390/biology11030346.
Plant growth-promoting rhizobacteria (PGPR) are beneficial microorganisms colonising the rhizosphere. PGPR are involved in plant growth promotion and plant priming against biotic and abiotic stresses. Plant-microbe interactions occur through chemical communications in the rhizosphere and a tripartite interaction mechanism between plants, pathogenic microbes and plant-beneficial microbes has been defined. However, comprehensive information on the rhizosphere communications between plants and microbes, the tripartite interactions and the biochemical implications of these interactions on the plant metabolome is minimal and not yet widely available nor well understood. Furthermore, the mechanistic nature of PGPR effects on induced systemic resistance (ISR) and priming in plants at the molecular and metabolic levels is yet to be fully elucidated. As such, research investigating chemical communication in the rhizosphere is currently underway. Over the past decades, metabolomics approaches have been extensively used in describing the detailed metabolome of organisms and have allowed the understanding of metabolic reprogramming in plants due to tripartite interactions. Here, we review communication systems between plants and microorganisms in the rhizosphere that lead to plant growth stimulation and priming/induced resistance and the applications of metabolomics in understanding these complex tripartite interactions.
植物促生根际细菌（PGPR）是定殖于根际的有益微生物。PGPR参与促进植物生长以及使植物对生物和非生物胁迫产生预适应。植物与微生物之间的相互作用通过根际中的化学信号传导发生，并且已经确定了植物、病原微生物和植物有益微生物之间的三方相互作用机制。然而，关于植物与微生物之间的根际信号传导、三方相互作用以及这些相互作用对植物代谢组的生化影响的全面信息极少，尚未广泛可得，也未得到充分理解。此外，PGPR对植物诱导系统抗性（ISR）和预适应在分子和代谢水平上的作用机制尚未完全阐明。因此，目前正在开展关于根际化学信号传导的研究。在过去几十年中，代谢组学方法已被广泛用于描述生物体的详细代谢组，并有助于理解由于三方相互作用导致的植物代谢重编程。在此，我们综述了根际中植物与微生物之间导致植物生长刺激和预适应/诱导抗性的信号传导系统，以及代谢组学在理解这些复杂三方相互作用中的应用。
