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首页> 外文期刊>Eukaryotic cell >Deletion of the Fungal Gene soft Disrupts Mutualistic Symbiosis between the Grass Endophyte Epichlo? festucae and the Host Plant
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Deletion of the Fungal Gene soft Disrupts Mutualistic Symbiosis between the Grass Endophyte Epichlo? festucae and the Host Plant

机译：软性真菌基因的缺失破坏了草内生表皮之间的共生关系？羊茅和寄主植物

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Hyphal anastomosis, or vegetative hyphal fusion, establishes the interconnection of individual hyphal strands into an integrated network of a fungal mycelium. In contrast to recent advances in the understanding of the molecular basis for hyphal anastomosis, knowledge of the physiological role of hyphal anastomosis in the natural habitats of filamentous fungi is still very limited. To investigate the role of hyphal anastomosis in fungal endophyte-plant interactions, we generated mutant strains lacking the Epichlo? festucae soft (so) gene, an ortholog of the hyphal anastomosis gene so in the endophytic fungus E. festucae. The E. festucae Δso mutant strains grew similarly to the wild-type strain in culture but with reduced aerial hyphae and completely lacked hyphal anastomosis. The most striking phenotype of the E. festucae Δso mutant strain was that it failed to establish a mutualistic symbiosis with the tall fescue plant host (Lolium arundinaceum); instead, it killed the host plant within 2 months after the initial infection. Microscopic examination revealed that the death of the tall fescue plant host was associated with the distortion and disorganization of plant cells. This study suggests that hyphal anastomosis may have an important role in the establishment/maintenance of fungal endophyte-host plant mutualistic symbiosis.
机译：菌丝吻合或营养菌丝融合，将单个菌丝链互连到真菌菌丝体的集成网络中。与对菌丝吻合的分子基础的理解的最新进展相反，关于丝状真菌自然生境中菌丝吻合的生理作用的知识仍然非常有限。为了研究菌丝接合在真菌内生植物-植物相互作用中的作用，我们产生了缺少 Epichlo？的突变菌株。 festucae soft （ so ）基因，是内生真菌E. festucae中的菌丝吻合基因 so 的直系同源物。羊茅大肠埃希菌Δ so 突变菌株的生长与培养的野生型菌株相似，但是气生菌丝减少，完全没有菌丝吻合。羊茅大肠埃希菌Δ so 突变株最显着的表型是未能与高羊茅植物寄主（Lolium arundinaceum）建立共生共生关系。相反，它在初次感染后2个月内杀死了寄主植物。显微镜检查表明，高羊茅植物宿主的死亡与植物细胞的扭曲和混乱有关。这项研究表明，菌丝吻合可能在真菌内生菌-宿主植物互生共生的建立/维持中起重要作用。

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