Low variation in arbuscular mycorrhizal fungal associations and effects on biomass among switchgrass cultivars

Emery, Sarah M.; Kinnetz, Erin Renee; Bell‐Dereske, Lukas; Stahlheber, Karen A.; Gross, Katherine L.; Pennington, Dennis

doi:10.1016/j.biombioe.2018.10.012

Cited by 23 publications

(14 citation statements)

References 67 publications

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“…This suggests the existence of a synergetic phosphatase relationship between Mortierella , and AMF‐associated plants. AMF, which represented 23.3% of the fungal community, are known to strongly associate with both corn and switchgrass (Emery et al, 2018; Sawers et al, 2008) and may be interacting with dominant Mortierella sp. to make phosphate bioavailable to these systems.…”

Section: Discussionmentioning

confidence: 99%

Can switchgrass increase carbon accrual in marginal soils? The importance of site selection

et al. 2020

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Most soil carbon (C) is in the form of soil organic matter (SOM), the composition of which is controlled by the plant–microbe–soil continuum. The extent to which plant and microbial inputs contribute to persistent SOM has been linked to edaphic properties such as mineralogy and aggregation. However, it is unknown how variation in plant inputs, microbial community structure, and soil physical and chemical attributes interact to influence the chemical classes that comprise SOM pools. We used two long‐term biofuel feedstock field experiments to test the influence of cropping systems (corn and switchgrass) and soil characteristics (sandy and silty loams) on microbial selection and SOM chemistry. Cropping system had a strong influence on water‐extractable organic C chemistry with perennial switchgrass generally having a higher chemical richness than the annual corn cropping system. Nonetheless, cropping system was a less influential driver of soil microbial community structure and overall C chemistry than soil type. Soil type was especially influential on fungal community structure and the chemical composition of the chloroform‐extractable C. Although plant inputs strongly influence the substrates available for decomposition and SOM formation, total C and nitrogen (N) did not differ between cropping systems within either site. We conclude this is likely due to enhanced microbial activity under the perennial cropping system. Silty soils also had a higher activity of phosphate and C liberating enzymes. After 8 years, silty loams still contained twice the total C and N as sandy loams, with no significant response to biofuel cropping system inputs. Together, these results demonstrate that initial site selection is critical to plant–microbe interactions and substantially impacts the potential for long‐term C accrual in soils under biofuel feedstock production.

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Section: Discussionmentioning

confidence: 99%

Can switchgrass increase carbon accrual in marginal soils? The importance of site selection

et al. 2020

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“…Medias ± Desvió estándar de los efectos de diferentes fertilizaciones química y biológica en la producción de biomasa húmeda e biomasa seca de las raíces de la B. Emery et al, (2018) mencionan no encontrar evidencia de la relación de las micorrizas con relación de la misma con la producción de biomasa aérea e subterránea, donde mencionan que este factor está relacionado con el nivel de fertilidad del suelo, por lo que los efectos positivos de las micorrizas son más evidentes cuando las características fértiles del suelo son bajas.…”

Section: Resultados Y Discusionesunclassified

Respuesta de la (Brachiaria Brizantha cv. Piatã) a la aplicación de micorrizas y fosfatos / Response of (Brachiaria Brizantha cv. Piatã) to the application of mycorrhizae and phosphates

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et al. 2020

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“…Along with N treatment and plot, these variables could account for 88% of the variation in switchgrass yield. In another bioenergy study on productive soils, Emery et al ( 59 ) did not observe a correlation between switchgrass yield and AMF diversity, but they did not analyze AMF diversity at the family level. According to Chagnon et al ( 60 ), AMF functional traits are shared at the family level.…”

Section: Discussionmentioning

confidence: 98%

Community Structure of Arbuscular Mycorrhizal Fungi in Soils of Switchgrass Harvested for Bioenergy

Dirks

Jackson

2020

Appl Environ Microbiol

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Learning more about the biodiversity and composition of arbuscular mycorrhizal fungi (AMF) under alternative agricultural management scenarios may be important to the sustainable intensification of switchgrass grown as a bioenergy crop. Using PacBio single-molecule sequencing and taxonomic resolution to the level of amplicon sequence variant (ASV), we assessed the effects of nitrogen amendment on AMF associating with switchgrass and explored relationships between AMF and switchgrass yield across three sites of varying productivity in Wisconsin. Nitrogen amendment had little effect on AMF diversity metrics or community composition. While AMF ASV diversity was not correlated with switchgrass yield, AMF family richness and switchgrass yield had a strong, positive relationship at one of our three sites. Each of our sites was dominated by unique ASVs of the species Paraglomus brasilianum, indicating regional segregation of AMF at the intraspecific level. Our molecular biodiversity survey identified putative core members of the switchgrass microbiome as well as novel clades of AMF, especially in the order Paraglomerales and the genus Nanoglomus. Furthermore, our phylogenies unite the unknown, cosmopolitan, soil-inhabiting clade GS24 with Pervetustaceae, an enigmatic family prevalent in stressful environments. Future studies should isolate and characterize the novel genetic diversity found in switchgrass agroecosystems and explore potential yield benefits of AMF richness. Importance We assessed the different species of beneficial fungi living in agricultural fields of switchgrass, a large grass grown for biofuels, using high-resolution DNA sequencing. Contrary to our expectations, the fungi were not greatly affected by fertilization. However, we found a positive relationship between plant productivity and the number of families of beneficial fungi at one site. Furthermore, we sequenced many species that could not be identified with existing reference databases. One group of fungi was highlighted in an earlier study for being widely distributed but of unknown taxonomy. We discovered that this group belonged to a family called Pervetustaceae, which may benefit switchgrass in stressful environments. To produce higher yielding switchgrass in a more sustainable manner, it could help to study these undescribed fungi and the ways in which they may contribute to greater switchgrass yield in the absence of fertilization.

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Low variation in arbuscular mycorrhizal fungal associations and effects on biomass among switchgrass cultivars

Cited by 23 publications

References 67 publications

Can switchgrass increase carbon accrual in marginal soils? The importance of site selection

Can switchgrass increase carbon accrual in marginal soils? The importance of site selection

Respuesta de la (Brachiaria Brizantha cv. Piatã) a la aplicación de micorrizas y fosfatos / Response of (Brachiaria Brizantha cv. Piatã) to the application of mycorrhizae and phosphates

Community Structure of Arbuscular Mycorrhizal Fungi in Soils of Switchgrass Harvested for Bioenergy

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