Endophytic Fungi Activated Similar Defense Strategies ofAchnatherum sibiricumHost to Different Trophic Types of Pathogens
Endophytic Fungi Activated Similar Defense Strategies ofAchnatherum sibiricumHost to Different Trophic Types of Pathogens
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不同营养型病原菌对内生真菌激活的相似防御策略
DOI：
10.3389/fmicb.2020.01607
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发表时间：
2020-07-24
影响因子：
5.2
通讯作者：
Ren, Anzhi
中科院分区：
文献类型：
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作者：
Shi, Xinjian;Qin, Tianzi;Ren, Anzhi
内生真菌能增强禾本科植物对食草动物的抗性。然而，关于病原真菌抗性的报道有限，其结论也不一致。本研究选择了不同营养型的病原真菌，即活体营养型病原真菌Erysiphalesspecies和坏死型病原真菌Curvularia lunata，研究了Epichloe对西伯利亚蓟病原真菌抗性的影响。结果表明，与白粉菌属相比，C.在无内生菌（E-）的叶片中，lunataa 1引起更高程度的伤害和更低的光化学效率（Fv/Fm）。内生菌能明显减轻这两种病原菌对植物的伤害。内生菌侵染（E+）的叶片受害面积和Fv/Fm值在两种病原菌处理间相近，表明内生菌对寄主的有益作用在C. lunatathan时，他们暴露于Erysiphales物种。我们发现A.西伯利亚植物启动了茉莉酸（JA）相关的抗病途径C. lunatabut水杨酸（SA）相关途径抵抗白粉菌物种。内生真菌对水杨酸含量没有影响，但提高了茉莉酸和总酚含量，表明内生真菌感染可能增强了金龟子的抗性。sibiricum通过相似的途径对这两种不同营养型的病原体产生作用。
It is well documented thatEpichloeendophytes can enhance the resistance of grasses to herbivory. However, reports on resistance to pathogenic fungi are limited, and their conclusions are variable. In this study, we chose pathogenic fungi with different trophic types, namely, the biotrophic pathogenErysiphalesspecies and the necrotrophic pathogenCurvularia lunata, to test the effects ofEpichloeon the pathogen resistance ofAchnatherum sibiricum. The results showed that, compared toErysiphalesspecies,C. lunatacaused a higher degree of damage and lower photochemical efficiency (Fv/Fm) in endophyte-free (E-) leaves. Endophytes significantly alleviated the damage caused by these two pathogens. The leaf damaged area andFv/Fmof endophyte-infected (E+) leaves were similar between the two pathogen treatments, indicating that the beneficial effects of endophytes were more significant when hosts were exposed toC. lunatathan when they were exposed toErysiphalesspecies. We found thatA. sibiricuminitiated jasmonic acid (JA)-related pathways to resistC. lunatabut salicylic acid (SA)-related pathways to resistErysiphalesspecies. Endophytic fungi had no effect on the content of SA but increased the content of JA and total phenolic compounds, which suggest that endophyte infection might enhance the resistance ofA. sibiricumto these two different trophic types of pathogens through similar pathways.