Gene analysis reveals that leaf litter from Epichloë endophyte-infected perennial ryegrass alters diversity and abundance of soil microbes involved in nitrification and denitrification

Chen, Zhenjiang; Jin, Yuanyuan; Xiang, Yanqiao; Wei, Xuekai; Li, Chunjie; White, James F.; Zhang, Nan

doi:10.1016/j.soilbio.2020.108123

Cited by 18 publications

(12 citation statements)

References 72 publications

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“…The same study found that ammonia and nitrogen oxidizing bacteria were higher in all E+ situations over 18 months. Similarly, Chen et al [198] found that incorporation of Epichloë-infected perennial ryegrass litter into soil led to an increase in ammonia-oxidizing bacteria across different time points. This is consistent with previous studies finding increased soil N in E+ grass soils.…”

Section: Microbiome Changes Due To Endophyte Infectionmentioning

confidence: 88%

Interaction between Grasses and Epichloë Endophytes and Its Significance to Biotic and Abiotic Stress Tolerance and the Rhizosphere

et al. 2021

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Cool-season grasses are the most common forage types in livestock operations and amenities. Several of the cool-season grasses establish mutualistic associations with an endophytic fungus of the Epichloë genus. The grasses and endophytic fungi have evolved over a long period of time to form host-fungus specific relationships that confer protection for the grass against various stressors in exchange for housing and nutrients to the fungus. This review provides an overview of the mechanisms by which Epichloë endophytes and grasses interact, including molecular pathways for secondary metabolite production. It also outlines specific mechanisms by which the endophyte helps protect the plant from various abiotic and biotic stressors. Finally, the review provides information on how Epichloë infection of grass and stressors affect the rhizosphere environment of the plant.

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Section: Microbiome Changes Due To Endophyte Infectionmentioning

confidence: 88%

Interaction between Grasses and Epichloë Endophytes and Its Significance to Biotic and Abiotic Stress Tolerance and the Rhizosphere

et al. 2021

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“…There are significant differences in endophytes effect on abundance, diversity, and structure of the bacterial and fungal communities in soil (Casas et al., 2011; Jenkins et al., 2006; Rojas et al., 2016). A number of studies have been conducted to evaluate the contribution of Epichloë endophyte infection and environmental factors (plant growing stages, soil pH, soil type, soil fertility, temperature, altitude, N fertilization, symbiotic microorganisms, and precipitation) to the copy number and diversity of the nitrifying ( amoA ‐AOB and amoA ‐AOA) genes (Z. Chen et al., 2021; Erguder et al., 2010; Yang et al., 2015). Although Epichloë endophyte of grasses are distributed in the aboveground tissues on host plants, but they can influence soil physical properties, soil nutrients, and microbial diversity through influencing litter decomposition and root exudates (Z. Chen et al., 2021; Hosseini et al., 2015a).…”

Section: Discussionmentioning

confidence: 99%

“…Z. Chen et al. (2021) reported that litter containing Epichloë endophyte significantly enhanced the copy number of the amoA ‐AOA gene, compared with the copy number of the amoA ‐AOA.…”

Section: Discussionmentioning

confidence: 99%

“…Although Epichloë endophyte of grasses are distributed in the aboveground tissues on host plants, but they can influence soil physical properties, soil nutrients, and microbial diversity through influencing litter decomposition and root exudates (Z. Chen et al, 2021;Hosseini et al, 2015a). The study confirmed the presence of Epichloë endophyte significantly enhanced the copy number of the nitrifying (amoA-AOB and amoA-AOA) genes, and the amoA-AOA/amoA-AOB gene ratios in rhizospheric soils of A. inebrians plants from different ecotypes.…”

Section: 3mentioning

confidence: 99%

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Effects of Achnatherum inebrians ecotypes and endophyte status on plant growth, plant nutrient, soil fertility and soil microbial community

Jin

Chen

et al. 2022

Soil Science Soc of Amer J

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Effects of endophytes infection on bacterial and fungal communities in soil have been extensively studied. However, how the presence of Epichloë endophytes and environmental factors influence the nitrifying genes abundance of ammonia-oxidizing archaea (amoA-AOA) and bacteria (amoA-AOB), and denitrifying genes abundances of N reduction (nirS and nirK) and nitrous oxide reduction (nosZ) in soil is unclear. In the study, the copy number of 16S rRNA, 18S rRNA, amoA-AOB, amoA-AOA, nirS, nirK, and nosZ genes in rhizosphere soils of drunken horse grass [Achnatherum inebrians (Hance) Keng] with the infected (E+) and uninfected (E-)endophyte five ecotypes after 3 yr field cultivation were investigated using quantitative polymerase chain reaction (PCR). The effects of A. inebrians in geographic source on plant growth, soil fertility, and microbial community was greater than in different endophyte status. The copy number of the 16S rRNA, amoA-AOA, nirK, and nosZ genes from different ecotypes (Qinghai, QH; and Tianzhu, TZ) were significantly affected by Epichloë endophyte. The copy number of the 16S rRNA, 18S rRNA, amoA-AOB. amoA-AOA, nirS, nirK, and nosZ genes positively related to soil pH, moisture, C/N ratio, and soil ammonium nitrogen (NH 4 + ), and soil organic carbon (SOC) contents.Endophyte infection significantly increased plant biomass of A. inebrians from QH ecotype. Plant total chlorophyll and soil nitrate nitrogen (NO 3 -) were the main factor for the Epichloë endophyte and ecotype to affect plant dry weight. Further studies are required to confirm the regulation of soil NO 3 as an important factor in Epichloë endophyte affecting plant growth and the soil microbial community structure in relation to N cycling.

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“…These endophytes often infect temperate grasses of the Pooideae subfamily by systematically colonizing their mycelium in the intercellular spaces of host plants and spread in all nutrient-rich tissues except roots [11,12]. Host species have symbiotically conferred resistance against, including drought, heavy metals, salinity, cold, allelopathy, pathogens and insects [13][14][15]. Epichloë endophytes provide certain benefits to host grass in seed germination, plant height and photosynthesis [16].…”

Section: Introductionmentioning

confidence: 99%

Influence of Interactions between Nitrogen, Phosphorus Supply and Epichloёbromicola on Growth of Wild Barley (Hordeum brevisubulatum)

Lang

Zhou

Chen

et al. 2021

JoF

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Epichloë endophytes are biotrophic fungi that establish mutualistic symbiotic relationship with grasses and affect performance of the host under different environments. Wild barley (Hordeum brevisubulatum) is an important forage grass and often infected by Epichloë bromicola, thus showing tolerances to stresses. Since the plant growth correlates with both microbial infection and nutrient stoichiometry, this study was performed to investigate whether the function of Epichloë bromicola endophyte to improve host growth depend upon the nitrogen (N), phosphorus (P) fertilization. Epichloë-infected (E+) and Epichloë-free (E−) wild barley plants were subjected to nine types of mixed N (0.2 mM, 3 mM, 15 mM) and P (0.01 mM, 0.1 mM, 1.5 mM) levels treatments for 90 d to collect plant samples and determine multiple related indexes. We found that E. bromicola and N, P additions positively affected seed germination. Further, E. bromicola significantly enhanced chlorophyll content and root metabolic activity under N-deficiency, and meanwhile, might alter allocation of photosynthate under different conditions. The contents of N, P and stoichiometry of C:N:P of E+ plants were significantly higher than that of E− under nutrient deficiency, but contrary results were observed under adequate nutrients. Therefore, we propose that the growth-promoting ability of E. bromicola is closely correlated with N and P additional levels. Under low N, P additions, positive roles of endophyte are significant as opposed to negative roles under high N, P additions.

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Gene analysis reveals that leaf litter from Epichloë endophyte-infected perennial ryegrass alters diversity and abundance of soil microbes involved in nitrification and denitrification

Cited by 18 publications

References 72 publications

Interaction between Grasses and Epichloë Endophytes and Its Significance to Biotic and Abiotic Stress Tolerance and the Rhizosphere

Interaction between Grasses and Epichloë Endophytes and Its Significance to Biotic and Abiotic Stress Tolerance and the Rhizosphere

Effects of Achnatherum inebrians ecotypes and endophyte status on plant growth, plant nutrient, soil fertility and soil microbial community

Influence of Interactions between Nitrogen, Phosphorus Supply and Epichloёbromicola on Growth of Wild Barley (Hordeum brevisubulatum)

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