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Ectomycorrhizal Specificity Patterns in a Mixed Pinus contorta and Picea engelmannii Forest in Yellowstone National Park

机译:黄石国家公园的松树和青云杉混交林的菌根特异模式

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摘要

We used molecular genetic methods to test two hypotheses, (i) that host plant specificity among ectomycorrhizal fungi would be common in a closed-canopy, mixed Pinus contorta-Picea engelmannii forest in Yellowstone National Park and (ii) that specificity would be more common in the early successional tree species, P. contorta, than in the invader, P. engelmannii. We identified 28 ectomycorrhizal fungal species collected from 27 soil cores. The proportion of P. engelmannii to P. contorta ectomycorrhizae was nearly equal (52 and 48%, respectively). Of the 28 fungal species, 18 composed greater than 95% of the fungal community. No species was associated exclusively with P. contorta, but four species, each found in only one core, and one species found in two cores were associated exclusively with P. engelmannii. These fungi composed less than 5% of the total ectomycorrhizae. Thus, neither hypothesis was supported, and hypothesized benefits of ectomycorrhizal specificity to both trees and fungi probably do not exist in this system.
机译:我们使用分子遗传学方法测试了两个假设,(i)外生菌根真菌在寄主植物中的特异性在黄石国家公园的密闭冠脉松树-Picea engelmannii森林中很常见,(ii)特异性更常见在早期演替树种中,P。contorta比入侵者中的P. engelmannii好。我们确定了从27个土壤核心收集的28种外生菌根真菌。英格兰假单胞菌与扭转性柯氏疟原虫菌根的比例几乎相等(分别为52%和48%)。在28种真菌中,有18种构成了95%以上的真菌群落。没有任何物种与斑节对虾专门相关,但是有四个物种,每个仅在一个核心中发现,而在两个核心中发现的一个物种仅与恩氏疟原虫相关。这些真菌仅占总外生菌根的不到5%。因此,这两个假设都没有得到支持,并且在该系统中可能没有假设的对树木和真菌的菌根特异性的益处。

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