Response of endophytic fungi of Stipa grandis to experimental plant function group removal in Inner Mongolia steppe, China
Response of endophytic fungi of Stipa grandis to experimental plant function group removal in Inner Mongolia steppe, China
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DOI：
10.1007/s13225-010-0040-6
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发表时间：
2010-04
期刊：
影响因子：
20.3
通讯作者：
Yuan Su;Liang-Dong Guo;K. Hyde
中科院分区：
文献类型：
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作者：
Yuan Su;Liang-Dong Guo;K. Hyde
对内蒙古大针茅草原的内生真菌进行了调查。从去除不同植物功能团的四个处理中获得的植物组织中鉴定出34个真菌类群。从叶中分离到9个分类群，从根中分离到25个分类群，叶和根中均未发现分类群。根的定殖率显著高于叶。这一发现与大多数以前的研究不同，可能是因为每年生长的树叶较小，而根部则年复一年地存在于地下。链格孢霉Alternaria sp.1和果蝇(Prenophora sp.)是4个处理中的优势种。处理1和处理2的根部以雷氏镰刀菌为主，处理2的根部以赤霉菌为主。内生菌在处理III和处理IV中占优势。内生菌的水平传播可能发生在相同或不同草种之间。这通常是通过根部发生的，这也解释了更高的多样性。这些结果表明，周围植物的多样性或植物组成会影响巨杉的内生菌群落。如果内生植物群落随着功能植物群的变化而改变，那么这可能会影响生态系统功能的动态。全球变暖和人类活动会加剧物种灭绝，因此，如果某些官能团消失，真菌群落也会发生变化。
Endophytic fungi associated with Stipa grandis in the Inner Mongolia steppe were investigated. Thirty-four fungal taxa were identified from plant tissues obtained in four treatments where different plant functional groups were removed. Nine taxa were obtained from leaves and 25 from roots; and no taxa occurred in both leaves and roots. Colonization rates were significantly higher in roots than in leaves. This finding differs from most previous studies and may be due to the small size of the leaves which grow annually, as compared to the roots which persist from year to year under the ground. Alternaria sp. 1 and Pyrenophora sp., both isolated from leaves, were the dominant species in the four treatments. Fusarium redolens was dominant in the roots in treatments I and II, and Phialophora sp. was dominant in treatments III and IV. Horizontal transmission of endophytes may occur between the same and different grass species. This would normally occur through the roots, again accounting for the higher diversity. The results suggest that surrounding plant diversity or plant composition can affect endophyte communities of S. grandis. If endophyte communities alter with change of functional plant groups, then this is likely to affect the dynamics of ecosystem functioning. Global warming and human activities can increase species extinction, therefore, if some functional groups disappear, then the fungi communities will also change.