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Studies on interactions between inoculated arbuscular mycorrhizal fungi and the root bacterial and fungal communities under field conditions

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  1. Tez No: 608022
  2. Yazar: TURGUT YİĞİT AKYOL
  3. Danışmanlar: PROF. DR. SHUSEIS
  4. Tez Türü: Doktora
  5. Konular: Mikrobiyoloji, Microbiology
  6. Anahtar Kelimeler: Belirtilmemiş.
  7. Yıl: 2019
  8. Dil: İngilizce
  9. Üniversite: Tohoku University
  10. Enstitü: Yurtdışı Enstitü
  11. Ana Bilim Dalı: Belirtilmemiş.
  12. Bilim Dalı: Belirtilmemiş.
  13. Sayfa Sayısı: 81

Özet

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Özet (Çeviri)

Arbuscular mycorrhizal (AM) fungi are important members of root microbiome and can be used as biofertilizers for sustainable agriculture. To assess the interactions among the introduced AM fungus, indigenous microbial communities, and the plant; bacterial and fungal communities of roots inoculated with a commercial AM fungal inoculum in six agricultural fields were investigated by using high-throughput sequencing and an analytical pipeline providing fixed operational taxonomic units (OTUs) as output. It was found that the abundance of introduced AM fungus was increased with inoculation and inoculation enhanced plant growth in all the fields, implying introduced AM fungus were able to establish and promote plant growth in a broad range of fields. Although the effect of inoculation on the alpha diversity was marginal, it significantly influenced the root microbial community structure in all the fields. Inoculation changed the abundance of both indigenous AM fungi and other fungal members but no fungal taxa were consistently altered through the fields. On the other hand, inoculation consistently enriched several bacterial OTUs, by changing the abundance of indigenous bacteria and introducing new bacteria through the inoculum (inoculum-associated bacteria). Some inoculum-associated bacteria were tightly interacted with introduced AM fungus. These OTUs assigned to the genera such as Burkholderia, Cellulomonas, Microbacterium, Sphingomonas and Streptomyces and could be the candidates of mycorrhizospheric bacteria that could help establishment and/or functioning of the introduced AM fungus. Inoculated AM fungus also interacted with indigenous bacteria with putative beneficial traits, suggesting that inoculated AM fungus could recruit specific taxa to confer a better plant performance. Four bacterial families, Methylobacteriaceae, Acetobacteraceae, Armatimonadaceae and Alicyclobacillaceae, were consistently reduced with inoculation, possibly due to the indirect effect of the inoculum (i.e. via changing the plant status). Network analysis revealed that a cluster of indigenous AM fungi including three Gigaspora and one Acaulospora OTUs that were negatively interacted with the introduced AM fungus, suggesting a niche competition between these two groups of AM fungi. This cluster also included the indigenous bacteria that negatively correlated with introduced AM fungus, suggesting an inhibitory effect of these bacteria on the inoculated AM fungus. This set of indigenous AM fungi and bacteria could determine the establishment of the introduced AM fungus. To my knowledge, this is the first large-scale study to investigate the interactions between AM fungal inoculation and the indigenous root microbial communities in agricultural fields at high resolution.

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