Mycorrhizal associates of Cephalanthera falcata (Orchidaceae) in a habitat with giant individuals,Ecological Research

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Mycorrhizal associates of Cephalanthera falcata (Orchidaceae) in a habitat with giant individuals
Ecological Research ( IF 1.7 ) Pub Date : 2020-11-03 , DOI: 10.1111/1440-1703.12187
Masahide Yamato ₁ , Ryota Kosaka ₁ , Yurika Masui ₁ , Yugo Goda ₁ , Shunsei Shirasaka ₁ , Atsushi Maruyama ₂ , Tomohisa Yukawa ₃

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We studied mycorrhizal symbioses of Cephalanthera falcata (Orchidaceae) in a population that included giant individuals, some of which were over 50 cm in height and had more than 10 shoots, as well as in two nearby habitats without giant individuals. For C. falcata adults in the habitat with giant individuals, a fungal lineage in the ectomycorrhiza‐forming clade of Sebacinales was detected as the dominant mycobiont. Furthermore, higher ¹³C enrichment, which is an indicator of mycoheterotrophy, was found in these C. falcata individuals compared to those in the two nearby habitats. These results indicate that the growth of giant C. falcata individuals may be a result of the increased ability of Sebacinales fungi to transfer carbon to the orchids. Furthermore, we attempted to discern the effect of mycobiont taxa on seedling development in the three habitats. Contrary to our expectations, Sebacinales fungi were not found to significantly impact seedling growth as this orchid was predominantly colonized by Thelephoraceae fungi at the seedling stage. These results suggest that seedling growth is mostly enhanced by symbiosis with Thelephoraceae fungi in this orchid, and that the growth of giant individuals due to colonization by Sebacinales fungi may occur subsequently.

中文翻译：

栖息地中有大型个体的头孢菌科（兰科）的菌根同伴

我们研究了头孢菌属（兰科）的菌根共生体，其中包括巨型个体，其中一些个体身高超过50厘米，芽长超过10个，以及在附近两个没有巨型个体的栖息地。对于C.楹与巨型个体栖息地的成年人，在蜡壳耳目的外生菌根形成枝真菌谱系检测为主导mycobiont。此外，与附近两个生境中的那些相比，在这些恶臭念珠菌个体中发现了较高的¹³ C富集，这是真菌异养的指标。这些结果表明，巨型C. falcata的生长个体可能是Sebacinales真菌将碳转移到兰花的能力增强的结果。此外，我们试图辨别出真菌生生物群对这三个生境中幼苗发育的影响。与我们的预期相反，未发现Sebacinales真菌对幼苗的生长有显着影响，因为该兰花在苗期主要被衣藻科真菌定殖。这些结果表明，该兰花中与Thelephoraceae真菌共生可极大地促进幼苗的生长，并且随后可能会发生由于Sebacinales真菌定植而导致的大型个体的生长。

更新日期：2020-11-03

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