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Belowground connections between germlings and mycorrhizal networks of arbuscular mycorrhizal fungi

机译:丛枝菌根真菌的幼苗与菌根网络之间的地下连接

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Arbuscular mycorrhizal fungi (AMF), which establish mutualistic symbioses with most land plant species, are obligate biotrophs; nevertheless, their spores can germinate in the absence of the hosts. Such inconsistent behaviour, representing a strong selective disadvantage, is balanced by diverse survival strategies: a wide host range, growth arrest in the absence of host signals, unequivocal host recognition (Giovannetti et al., 1993; 1994; Logi et al. 1998; Akiyama et al., 2006). The ability of AMF hyphae to fuse (Giovannetti et al., 1999; Giovannetti et al., 2004; Croll et al., 2009) might represent a fundamental survival strategy, since germlings could plug into compatible mycorrhizal networks by means of hyphal fusions (anastomoses), thus gaining access to plant-derived carbon before undergoing any growth arrest.
机译:丛枝菌根真菌(AMF)是专性的生物营养菌,与大多数陆地植物物种建立了共生共生关系。但是,它们的孢子可以在没有宿主的情况下发芽。这种不一致的行为代表着强烈的选择性劣势,可以通过多种生存策略加以平衡:广泛的寄主范围,在没有寄主信号的情况下生长停滞,明确的寄主识别(Giovannetti等,1993; 1994; Logi等,1998; N。 Akiyama等,2006)。 AMF菌丝融合的能力(Giovannetti等,1999; Giovannetti等,2004; Croll等,2009)可能代表了一种基本的生存策略,因为种苗可以通过菌丝融合插入相容的菌根网络中(吻合),因此在经历任何生长停滞之前就可以获取植物来源的碳。

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