Effect of grass species and fungal endophyte on soil nitrification potential

Bowatte, Saman; Barrett, Brent; Luscombe, Claire; Hume, D. E.; Luo, Dongwen; Theobald, P. W.; Newton, Paul C. D.

doi:10.1080/00288233.2011.606325

Cited by 18 publications

(15 citation statements)

References 47 publications

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“…Acremonium are also grass endophytes that enhance soil nitrification rates (Bowatte et al . ), a common feature of Japanese barberry invaded soils (Ehrenfeld et al . ).…”

Section: Discussionmentioning

confidence: 99%

Amplicon pyrosequencing reveals the soil microbial diversity associated with invasive Japanese barberry (Berberis thunbergii DC.)

2013

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The soil microbial community acts as a reservoir of microbes that directly influences the structure and composition of the aboveground plant community, promotes plant growth, increases stress tolerance and mediates local patterns of nutrient cycling. Direct interactions between plants and rhizosphere-dwelling microorganisms occur at, or near, the surface of the root. Upon introduction and establishment, invasive plants modify the soil microbial communities and soil biochemistry affecting bioremediation efforts and future plant communities. Here, we used tag-encoded FLX amplicon 454 pyrosequencing (TEFAP) to characterize the bacterial and fungal community diversity in the rhizosphere of Berberis thunbergii DC. (Japanese barberry) from invasive stands in coastal Maine to investigate effects of soil type, soil chemistry and surrounding plant cover on the soil microbial community structure. Acidobacteria, Actinobacteria, Proteobacteria and Verrucomicrobia were the dominant bacterial phyla, whereas fungal communities were comprised mostly of Ascomycota and Basidiomycota phyla members, including Agaricomycetes and Sordariomycetes. Bulk soil chemistry had more effect on the bacterial community structure than the fungal community. An effect of geographic location was apparent in the rhizosphere microbial communities, yet it was less significant than the effect of surrounding plant cover. These data demonstrate a high degree of spatial variation in the rhizosphere microbial communities of Japanese barberry with apparent effects of soil chemistry, location and canopy cover on the microbial community structure.

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“…Acremonium are also grass endophytes that enhance soil nitrification rates (Bowatte et al . ), a common feature of Japanese barberry invaded soils (Ehrenfeld et al . ).…”

Section: Discussionmentioning

confidence: 99%

Amplicon pyrosequencing reveals the soil microbial diversity associated with invasive Japanese barberry (Berberis thunbergii DC.)

2013

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“…In a previous greenhouse study involving soils cultivated with three C3 grassendophyte combinations (i.e., Festuca arundinacea-Neotyphodium coenophialum; F. pratensis-N. uncinatum; Lolium perenne-N. lolii) and three C4 species (i.e., B. decumbens, Paspalum dilatatum and Pennisetum clandestinum) in association with unknown species of Acremonium endophyte, also found significant increase in nitrification due to endophyte presence in all soil samples incubated [7].…”

Section: Resultsmentioning

confidence: 82%

“…In addition, it is known that host-endophyte symbiosis depends on plant-endophyte genotypic interactions and interactions with environmental conditions [37][38][39]. The differences noted in endophyte effect on nitrification under greenhouse and field conditions may be due to differences in soil types, soil organic matter (or nutrient) contents, soil moisture contents and biotic conditions [7,33,40,41]. Under field conditions, potential benefit of endophyte may be negated by large number of confounding factors beyond experimental control [42].…”

Section: Resultsmentioning

confidence: 99%

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Potential Role of Fungal Endophytes in Biological Nitrification Inhibition in Brachiaria Grass Species

Cardoso¹,

Odokonyero²,

Rao³

et al. 2017

J Plant Biochem Physiol

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Brachiaria species have the ability to suppress nitrification in soil by releasing an inhibitory compound called 'brachialactone' from its roots; a process termed biological nitrification inhibition (BNI). This study tested the hypothesis that endophytic association with Brachiaria grass improves BNI activity of root tissues and reduces nitrification in Brachiaria-cultivated soil. Four cultivars of Brachiaria [i.e., B. decumbens (Basilisk), B. humidicola (Tully), B. brizantha (Marandu)], and one hybrid (Cayman) were evaluated for their BNI potentials under greenhouse and field conditions. In each experiment, plants were grown with (E+) and without (E-) endophyte inoculation, and harvested after eight months of growth. Root tissues and rhizosphere soil were taken from 0-30 cm depth and analyzed for BNI activity and nitrification, using bioluminescence assays and soil incubation, respectively. In the greenhouse experiment, endophyte association reduced BNI activity of root tissues in at least two cultivars (Basilisk and Marandu; by 13% and 6%, respectively); and this corresponded with 9% and 10% higher rates of nitrification (for Basilisk and Marandu, respectively) in soils grown with endophyte-infected plants than in the control. Under field conditions, endophyte association increased rates of nitrification in Marandu and Cayman by a similar magnitude of 12%, compared with endophyte-free control. In both experiments, Tully and Basilisk were essentially the most outstanding candidates for low-nitrifying forage systems, as shown by their high BNI activity and/or low rates of nitrification. The study also showed that cultivating soils with Brachiaria grasses could offer more agronomic and environmental benefits due to low N loss through nitrification than leaving the soils bare. However, further research to identify endophyte species that could suppress soil nitrifying microbes may enhance BNI process in Brachiaria.

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“…Perennial grass infected with Neotyphodium endophytes in temperate turf grasses is reported to alter host grass physiology, root morphology and function, including increased root growth and biomass, longer root hairs and decreased root diameter [10][11][12]. Due to interactions of several factors, some cultivars may benefit from the symbiotic associations while others may not experience benefit under different environmental conditions.…”

Section: Introductionmentioning

confidence: 99%

Effect of Endophyte Association with Brachiaria Species on Shoot and Root Morpho-physiological Responses under Drought Stress

Odokonyero¹,

Acuña²,

Cardoso³

et al. 2017

J Plant Biochem Physiol

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A greenhouse experiment was conducted at the International Centre for Tropical Agriculture in Colombia to evaluate effects of the fungal endophyte, Acremonium implicatum, on growth and physiological responses of five Brachiaria cultivars. Plants were grown under well-watered (WW) and drought-stressed (DS) conditions, with (E+) and without (E-) endophyte; and their morpho-physiological responses were determined. Significant two-way and three-way interactions produced variable effects on leaf area, number of tillers, shoot elongation, shoot biomass, total root diameter, diameter of cortex, area of stele and diameter of xylem vessel. Main effect of endophyte significantly increased leaf stomatal conductance and reduced diameter of xylem. Smaller leaf area was found in endophyte-infected than control plants of three cultivars, both under WW and DS conditions, which indicates a cost of endophyte infection to the host cultivars. Large root diameter and area of stele under WW conditions, as well as small diameter of xylem vessels in some cultivars suggests that endophyte may improve efficiency for water uptake and use under different water regimes. Less Root Cortical Aerenchyma (RCA) was observed in endophyte-infected plants of Tully and Cayman than the control, which may influence plant capacity for resource acquisition in Brachiaria. Genotype-specific variation among hosts generally segregated the cultivars in terms of their shoot and root responses, based on presence (E+) or absence (E-) of endophyte. However, future studies should examine how association of A. implicatum with Brachiaria grass affects capacity for water uptake and carbon accumulation, and the role of RCA in these processes.

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Effect of grass species and fungal endophyte on soil nitrification potential

Cited by 18 publications

References 47 publications

Amplicon pyrosequencing reveals the soil microbial diversity associated with invasive Japanese barberry (Berberis thunbergii DC.)

Amplicon pyrosequencing reveals the soil microbial diversity associated with invasive Japanese barberry (Berberis thunbergii DC.)

Potential Role of Fungal Endophytes in Biological Nitrification Inhibition in Brachiaria Grass Species

Effect of Endophyte Association with Brachiaria Species on Shoot and Root Morpho-physiological Responses under Drought Stress

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