Mechanisms of silicon-induced fungal disease resistance in plants
Mechanisms of silicon-induced fungal disease resistance in plants
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DOI：
10.1016/j.plaphy.2021.05.031
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发表时间：
2021-05-27
影响因子：
6.5
通讯作者：
Yang, Youxin
中科院分区：
文献类型：
--
作者：
Ahammed, Golam Jalal;Yang, Youxin
硅（Si）作为植物生长的有益元素，并提供针对非生物和生物胁迫的保护。尽管有许多关于Si在增强植物对真菌病原体的抗性中的有益作用的报道，但其潜在机制在很大程度上仍不清楚。硅具有抗真菌活性;然而，Si诱导的提高的抗病性部分地表现为在角质层下和细胞壁中形成Si聚合的机械阻碍，其防止真菌侵入。此外，通过次级代谢途径快速产生防御化合物被认为是Si诱导的对真菌病原体的化学防御超越物理屏障的关键机制。此外，改善的矿物质营养保证了硅供应植物的健康状态，健康的植物表现出更好的光合潜力，抗氧化能力和抗病性。多种植物激素和它们的串扰介导硅诱导的基础以及诱导的电阻，但是，如何根吸收硅系统调制抗叶面病害在低硅积累的植物，需要深入调查。最近的研究还表明，硅影响效应触发的免疫影响宿主识别和/或限制受体-效应相互作用。在这里，我们回顾了硅在植物响应真菌病原体的作用。我们还讨论并提出了硅诱导增强植物抗病性的潜在机制。最后，我们确定了一些研究方法的局限性，在解决生物胁迫管理中的Si的有益作用。
Silicon (Si) acts as a beneficial element for plant growth and provides protection against abiotic and biotic stresses. Despite numerous reports on the beneficial role of Si in enhancing plant resistance to fungal pathogens, the underlying mechanisms remain largely unclear. Silicon shows antifungal activity; however, Si-induced improved disease resistance is partly manifested by the formation of Si polymerized mechanical obstruction under the cuticle and in cell walls, which prevents fungal ingress. Moreover, rapid production of defense compounds through secondary metabolic pathways is thought to be a key mechanism of Si-induced chemical defense against fungal pathogens beyond the physical barrier. Besides, improved mineral nutrition assures the healthy status of Si-supplied plants and a healthy plant exhibits better photosynthetic potential, antioxidant capacity and disease resistance. Multiple plant hormones and their crosstalk mediate the Si-induced basal as well as induced resistance; nonetheless, how root uptake of Si systemically modulates resistance to foliar diseases in low Si accumulating plants, needs in-depth investigation. Recent studies also indicate that Si influences effector-triggered immunity by affecting host recognition and/or limiting receptor-effector interactions. Here we review the role of Si in plant response to fungal pathogens. We also discuss and propose potential mechanisms of Si-induced enhanced disease resistance in plants. Finally, we identify some limitations of research approaches in addressing the beneficial roles of Si in biotic stress management.