Mycelial communities associated with Ostrya carpinifolia, Quercus pubescens and Pinus nigra in a patchy Sub-Mediterranean Karst woodland.

IF 3.8 2区 生物学 Q2 MYCOLOGY
Tanja Mrak, Philip Alan Brailey-Crane, Nataša Šibanc, Tijana Martinović, Jožica Gričar, Hojka Kraigher
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Abstract

Common mycorrhizal networks of ectomycorrhizal (EcM) fungi could be of great benefit to trees growing in the shallow soils of Sub-Mediterranean Karst ecosystems, potentially playing a crucial role in the survival of trees in this harsh environment. The first step to confirm the existence of such networks is to assess the extent and nature of symbiont sharing in the mycelial community. To address this question, we incubated in-growth mesh bags under the native Ostrya carpinifolia and Quercus pubescens, and the non-native Pinus nigra, over two consecutive years. In Q. pubescens and P. nigra, but not in O. carpinifolia, mycelium production was significantly higher in the year with higher spring precipitation, indicating the influence of climatic conditions, but also the identity of the host tree. We observed a complex interaction between tree species and sampling year in structuring the composition and diversity of mycelial communities. Local environmental conditions contributed additionally and were responsible for 21.46% of the community variation between samples. Although ~ 70% of fungal operational taxonomic units were shared across the studied tree species, distinct community compositions emerged, emphasizing the role of host tree specificity. Q. pubescens exhibited greater stability in EcM richness between sampling years, whereas P. nigra showed lower EcM richness, likely due to limited availability of compatible fungi and reliance on introduced fungal partners. Additionally, differences in EcM fungal exploration strategies were observed. O. carpinifolia and Q. pubescens mainly hosted non-specific EcM fungi with short distance exploration types. In contrast, EcM fungi of P. nigra had higher spatial spread, and were predominantly conifer specific. Overall, our results emphasize the importance of host specificity, soil parameters, spatial proximity, and climatic variability for the structuring of mycelial communities in fragmented forests.

Abstract Image

Abstract Image

Abstract Image

亚地中海斑驳喀斯特林地中栎、短毛栎和黑松菌丝群落。
外生菌根(EcM)真菌的共同菌根网络可能对生长在亚地中海喀斯特生态系统浅层土壤中的树木有很大的好处,可能在这种恶劣环境中对树木的生存起着至关重要的作用。确认这种网络存在的第一步是评估菌丝群落中共生体共享的程度和性质。为了解决这个问题,我们连续两年在本地的栎木、短毛栎和非本地的黑松下培养生长中的网袋。春季降水较多的年份,短毛栎(Q. pubescens)和黑栎(P. nigra)的菌丝体产量显著增加,而油桐(O. carpinifolia)的菌丝体产量则明显增加,这不仅表明了气候条件的影响,也表明了寄主树的身份。我们观察到树种和采样年份在菌丝群落组成和多样性的结构上存在复杂的相互作用。局部环境条件对样本间群落差异的贡献率为21.46%。尽管约70%的真菌操作分类单位在研究树种中是共享的,但不同的群落组成出现了,强调了宿主树特异性的作用。短毛栎在不同采样年份的EcM丰富度表现出更大的稳定性,而黑桫树的EcM丰富度较低,这可能是由于兼容真菌的可用性有限以及对引入真菌伴侣的依赖。此外,观察到EcM真菌探索策略的差异。柽柳和短毛栎主要寄主非特异性EcM真菌,具有短距离探索型。相比之下,黑桫椤的EcM真菌具有更高的空间分布,并且主要是针叶树特有的。总体而言,我们的研究结果强调了寄主特异性、土壤参数、空间邻近性和气候变异对破碎森林菌丝群落结构的重要性。
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来源期刊
Mycorrhiza
Mycorrhiza 生物-真菌学
CiteScore
8.20
自引率
2.60%
发文量
40
审稿时长
6-12 weeks
期刊介绍: Mycorrhiza is an international journal devoted to research into mycorrhizas - the widest symbioses in nature, involving plants and a range of soil fungi world-wide. The scope of Mycorrhiza covers all aspects of research into mycorrhizas, including molecular biology of the plants and fungi, fungal systematics, development and structure of mycorrhizas, and effects on plant physiology, productivity, reproduction and disease resistance. The scope also includes interactions between mycorrhizal fungi and other soil organisms and effects of mycorrhizas on plant biodiversity and ecosystem structure. Mycorrhiza contains original papers, short notes and review articles, along with commentaries and news items. It forms a platform for new concepts and discussions, and is a basis for a truly international forum of mycorrhizologists from all over the world.
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