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Forests 2016, 7(2), 44;

High-Throughput Sequencing Shows High Fungal Diversity and Community Segregation in the Rhizospheres of Container-Grown Conifer Seedlings

Department of Forest Mycology and Plant Pathology, Uppsala BioCenter, Swedish University of Agricultural Sciences, P.O. Box 7026, SE-75007 Uppsala, Sweden
Laboratory of Phytopathogenic Microorganisms, Institute of Botany at the Nature Research Centre, Žaliųjų Ežerų str. 49, LT-08406 Vilnius, Lithuania
Author to whom correspondence should be addressed.
Academic Editor: Timothy A. Martin
Received: 25 November 2015 / Revised: 1 February 2016 / Accepted: 4 February 2016 / Published: 17 February 2016
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Forest nurseries in Sweden produce ca. 360 million seedlings of Pinus sylvestris L. and Picea abies (L.) Karst. annually. Fungi represent the largest microbial component in rhizospheres and may significantly affect health and, consequently, quality of the seedlings. The aim of this study was to assess fungi focusing on pathogens in roots and the sphagnum peat growth substrate of healthy-looking P. sylvestris and P. abies seedlings from nine forest nurseries situated in northern, central and southern regions of Sweden. We hypothesized that nursery stock and the growth substrate can provide a venue for dissemination of fungal diseases. In each nursery and for each tree species, 100 seedlings with the growth substrate were collected during the dormant period. DNA was isolated from parts of root systems and from samples of the growth substrate, amplified using internal transcribed spacer of rDNA as a marker and 454-sequenced. Clustering at 98.5% similarity of 169,844 high-quality sequences resulted in 619 non-singleton fungal taxa. Although results showed that management practices in forest nurseries generally give a healthy stock, latent establishment of pathogenic fungi in both roots and the growth substrate supported the hypothesis. Furthermore, seedling roots and the growth substrate were inhabited by distinct communities of fungi, and lifestyles of these fungi largely determined community segregation into particular ecological niche. View Full-Text
Keywords: forest nursery; mycorrhiza; pathogens; sequencing; seedlings; tree health forest nursery; mycorrhiza; pathogens; sequencing; seedlings; tree health

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Menkis, A.; Burokienė, D.; Stenlid, J.; Stenström, E. High-Throughput Sequencing Shows High Fungal Diversity and Community Segregation in the Rhizospheres of Container-Grown Conifer Seedlings. Forests 2016, 7, 44.

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