Department of Agricultural and Environmental Sciences-Production, Landscape, Agroecology, University of Milan, 20133 Milan, Italy.
Int J Mol Sci. 2022 Jun 23;23(13):6990. doi: 10.3390/ijms23136990.
Endophytic plant-growth-promoting bacteria (ePGPB) are interesting tools for pest management strategies. However, the molecular interactions underlying specific biocontrol effects, particularly against phytopathogenic viruses, remain unexplored. Herein, we investigated the antiviral effects and triggers of induced systemic resistance mediated by four ePGPB ( strain R8, strain R16, strain 255-7, and strain 260-02) against four viruses (Cymbidium Ring Spot Virus-CymRSV; Cucumber Mosaic Virus-CMV; Potato Virus X-PVX; and Potato Virus Y-PVY) on plants under controlled conditions and compared them with a chitosan-based resistance inducer product. Our studies indicated that ePGPB- and chitosan-treated plants presented well-defined biocontrol efficacy against CymRSV and CMV, unlike PVX and PVY. They exhibited significant reductions in symptom severity while promoting plant height compared to nontreated, virus-infected controls. However, these phenotypic traits showed no association with relative virus quantification. Moreover, the tested defense-related genes ( (), (), and ()) implied the involvement of a salicylic-acid-related defense pathway triggered by gene upregulation.
内生植物促生细菌（ePGPB）是害虫管理策略的有趣工具。然而，特定生物防治作用的分子相互作用，特别是针对植物病原病毒的作用，仍未得到探索。在此，我们研究了四种内生植物促生细菌（菌株 R8、菌株 R16、菌株 255-7 和菌株 260-02）对受控制条件下的 植物的四种病毒（蝴蝶兰花叶病毒-CymRSV、黄瓜花叶病毒-CMV、马铃薯 X 病毒-PVX 和马铃薯 Y 病毒-PVY）的抗病毒作用和诱导系统抗性的触发作用，并将其与壳聚糖基抗性诱导剂产品进行了比较。我们的研究表明，内生植物促生细菌和壳聚糖处理的植物对 CymRSV 和 CMV 具有明确的生物防治效果，而对 PVX 和 PVY 则没有。与未处理、受病毒感染的对照相比，它们在降低症状严重程度的同时促进了植物的高度。然而，这些表型特征与相对病毒定量没有关联。此外，测试的防御相关基因（()、()和()）表明，基因的上调触发了水杨酸相关的防御途径。
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