Fungal endophyte increases the allelopathic effects of an invasive forb
Fungal endophyte increases the allelopathic effects of an invasive forb
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DOI：
10.1007/s00442-014-2891-0
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发表时间：
2014-05-01
期刊：
影响因子：
2.7
通讯作者：
Chen, Shuyan
中科院分区：
文献类型：
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作者：
Aschehoug, Erik T.;Callaway, Ragan M.;Chen, Shuyan
植物内生共生体可以对其宿主与病原体、竞争者和消费者的相互作用方式产生强大的影响。内生菌在植物中的存在可以改变食物网、群落组成和生态系统过程，这表明内生菌-植物共生体可能代表独特的扩展表型形式。我们测试了内生真菌互隔交链格孢（Alternaria alternata）（CID 120）的影响，在温室竞争实验中与北美本地束草Koeleria macrantha竞争时，入侵的杂类植物Centaurea stoebe的化感作用。结果表明，C.斯托比河感染内生真菌的大花菊花比不感染内生真菌的大花菊花生长快2倍以上。stoebe。然而，这种化感作用只是C.斯托比河在所有治疗中，大花，可能是因为我们的实验设计中的优先效应。据我们所知，这些结果是第一个实验证据植物和真菌内生菌之间的共生关系影响竞争植物之间的化感作用，从而提供洞察真菌内生菌可能会增加其主机的竞争能力的机制。
Endophytic plant symbionts can have powerful effects on the way their hosts interact with pathogens, competitors, and consumers. The presence of endophytes in plants can alter food webs, community composition and ecosystem processes, suggesting that endophyte-plant symbioses may represent unique forms of extended phenotypes. We tested the impact of the fungal endophyte Alternaria alternata (phylotype CID 120) on the allelopathic effect of the invasive forb Centaurea stoebe when in competition with the North American native bunchgrass Koeleria macrantha in a greenhouse competition experiment. The allelopathic effect of C. stoebe on K. macrantha when infected with the fungal endophyte was more than twice that of endophyte-free C. stoebe. However, this allelopathic effect was a small part of the very large competitive effect of C. stoebe on K. macrantha in all treatments, likely because of the priority effects in our experimental design. To our knowledge, these results are the first experimental evidence for a symbiotic relationship between plants and fungal endophytes affecting allelopathic interactions between competing plants, and thus provide insight into the mechanisms by which fungal endophytes may increase the competitive ability of their hosts.