Abstract Endophytic microbes intricately modulate host defense pathways upon challenge with any form of environmental stress. In the current study, endophytic Alcaligenes faecalis treated okra plants were found to exhibit significant resistance to cell-lysis and disintegration upon infection with Sclerotium rolfsii. Apart from the morphological amendments, a systemic induction in phenolic content was observed in the endophyte treated hosts, such as that of gallic, cinnamic, synaptic, vanillic, ferulic, t-chlorogenic and gentisic acid as well as rutin, quercetin and kaempferol. Simultaneously, an upregulation of peroxidase (PO) and superoxide dismutase (SOD) was observed in the endophyte treated host leaf tissues along with significant lignification at the collar regions. Though similar number of isoforms of PO and SOD were observed in the endophyte treated plants and uninoculated control yet a higher intensity of the former suggests activation of defense pathways due to endophytic colonization. Thus this study may provide a thorough comprehension of the correlation among various defense pathways occurring simultaneously in planta upon endophyte treatment which particularly protect the host from S. rolfsii infection.

中文翻译：

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内生性粪产碱菌通过诱导酚类和抗氧化酶介导重新设计针对罗尔夫菌核的宿主防御路线

摘要 在受到任何形式的环境压力挑战时，内生微生物会错综复杂地调节宿主防御途径。在目前的研究中，发现内生性粪产碱杆菌处理的秋葵植物在感染 Sclerotium rolfsii 后表现出显着的细胞裂解和分解抗性。除了形态学修正外，在内生菌处理的宿主中观察到酚类含量的全身诱导，例如没食子酸、肉桂酸、突触、香草酸、阿魏酸、t-绿原酸和龙胆酸以及芦丁、槲皮素和山奈酚。同时，在内生菌处理的宿主叶组织中观察到过氧化物酶 (PO) 和超氧化物歧化酶 (SOD) 的上调，以及领部区域的显着木质化。虽然在内生菌处理的植物和未接种的对照中观察到相似数量的 PO 和 SOD 同工型，但前者的更高强度表明由于内生菌定植而激活了防御途径。因此，这项研究可以提供对内生菌处理后在植物中同时发生的各种防御途径之间的相关性的全面理解，这些防御途径特别保护宿主免受 S. rolfsii 感染。