Endophyte Effects on Nutrient Acquisition in Tall Fescue Grown in Andisols

Rahman, M. Hasinur; Saiga, Suguru

doi:10.1080/01904160701700632

Cited by 15 publications

(14 citation statements)

References 38 publications

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“…Phosphorus translocation was positively and significantly correlated with N-use efficiency. In Japanese Andisol, Rahman and Saiga (2007b) observed that in the E+ plant, shoot dry matter was significantly and positively correlated with concentration of K, Ca, Mg, copper (Cu), zinc (Zn), and iron (Fe) but negatively correlated with P and manganese (Mn).…”

Section: Resultsmentioning

confidence: 98%

Response of Diploid Perennial Ryegrass to Fungal Endophyte AR29 Infections under Water Stress

Rahman¹,

Simpson²,

Matthew³

et al. 2015

Communications in Soil Science and Plant Analysis

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Asexual fungus Neotyphodium spp. are often associated with aboveground parts of different grasses. Perennial ryegrass (Lolium perenne L.), dominant cool-season grass species in New Zealand, is frequently infected by endophytic fungus (Neotyphodium lolli). To evaluate the growth, nutrient status, and avoidance to dehydration stress, clones of diploid perennial ryegrass either infected with Neotyphodium lolii AR29 endophyte (E+) or not infected (E−) were grown in a potted Andisol with intermittent wetting-drying cycles in a controlled growth chamber. Results showed that endophyte infection (E+) significantly reduced plant height, tiller number, shoot and root dry weights, and root volume with an associated increase in root/shoot ratios of ryegrass. The E+ plants showed a greater shoot and lower root avoidance to dehydration stress than the E− plants. The negative values of relative interaction intensity index between the diploid ryegrass and AR29 endophyte association suggested that these host-endophyte associations were parasitic under intermittent soil wetting-drying cycles. While the nitrogen (N) and phosphorus (P) concentration, plant production index, and water-use efficiency were significantly greater in E+ plant than in E− plants, the N and P efficiency ratios were greater in E− plants than in E+ plants. Results suggested that the endophyte mediation may have synergistic or antagonistic effects which depend on particular host genotype-endophyte combinations and environmental conditions to promote drought tolerance in grasses for degraded land restoration or forage production.

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Section: Resultsmentioning

confidence: 98%

Response of Diploid Perennial Ryegrass to Fungal Endophyte AR29 Infections under Water Stress

Rahman¹,

Simpson²,

Matthew³

et al. 2015

Communications in Soil Science and Plant Analysis

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“…Because of the well‐documented benefits of Neotyphodium infection for tall fescue under abiotic stress (Arechavaleta et al. , 1989; Malinowski, 1999; Rahman & Saiga, 2007), we predicted that after 5 yr of climate treatments the endophyte infection frequency (EIF) of tall fescue would be higher under elevated temperature and under ‘dry’ precipitation treatments. However, we found no support for this hypothesis.…”

Section: Discussionmentioning

confidence: 99%

Effects of multiple climate change factors on the tall fescue–fungal endophyte symbiosis: infection frequency and tissue chemistry

et al. 2010

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Summary• Climate change (altered CO 2 , warming, and precipitation) may affect plantmicrobial interactions, such as the Lolium arundinaceum-Neotyphodium coenophialum symbiosis, to alter future ecosystem structure and function.• To assess this possibility, tall fescue tillers were collected from an existing climate manipulation experiment in a constructed old-field community in Tennessee (USA). Endophyte infection frequency (EIF) was determined, and infected (E+) and uninfected (E)) tillers were analysed for tissue chemistry.• The EIF of tall fescue was higher under elevated CO 2 (91% infected) than with ambient CO 2 (81%) but was not affected by warming or precipitation treatments. Within E+ tillers, elevated CO 2 decreased alkaloid concentrations of both ergovaline and loline, by c. 30%; whereas warming increased loline concentrations 28% but had no effect on ergovaline. Independent of endophyte infection, elevated CO 2 reduced concentrations of nitrogen, cellulose, hemicellulose, and lignin.• These results suggest that elevated CO 2 , more than changes in temperature or precipitation, may promote this grass-fungal symbiosis, leading to higher EIF in tall fescue in old-field communities. However, as all three climate factors are likely to change in the future, predicting the symbiotic response and resulting ecological consequences may be difficult and dependent on the specific atmospheric and climatic conditions encountered.

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“…Among these orders, the relative abundance of some dominant fungal OTUs affiliated to the Acremonium, Bionectria, and Fusarium genera significantly increased with the presence of alfalfa. While the Acremonium genus is well known as a fungal endophyte of plants that improves mineral nutrition [72], Bionectria and Fusarium species are often plant pathogens [73,74]. Conversely, in bare soil, the Microascales order was the only one whose relative abundance increased.…”

Section: Impact Of Vegetation On Soil Microbial Abundance and Diversitymentioning

confidence: 98%

The Bacterial and Fungal Diversity of an Aged PAH- and Heavy Metal-Contaminated Soil is Affected by Plant Cover and Edaphic Parameters

Bourceret

Cébron

Tisserant³

et al. 2015

Microb Ecol

107

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Industrial wasteland soils with aged PAH and heavy metal contaminations are environments where pollutant toxicity has been maintained for decades. Although the communities may be well adapted to the presence of stressors, knowledge about microbial diversity in such soils is scarce. Soil microbial community dynamics can be driven by the presence of plants, but the impact of plant development on selection or diversification of microorganisms in these soils has not been established yet. To test these hypotheses, aged-contaminated soil samples from a field trial were collected. Plots planted with alfalfa were compared to bare soil plots, and bacterial and fungal diversity and abundance were assessed after 2 and 6 years. Using pyrosequencing of 16S rRNA gene and ITS amplicons, we showed that the bacterial community was dominated by Proteobacteria, Actinobacteria, and Bacteroidetes and was characterized by low Acidobacteria abundance, while the fungal community was mainly represented by members of the Ascomycota. The short-term toxic impact of pollutants usually reduces the microbial diversity, yet in our samples bacterial and fungal species richness and diversity was high suggesting that the community structure and diversity adapted to the contaminated soil over decades. The presence of plants induced higher bacterial and fungal diversity than in bare soil. It also increased the relative abundance of bacterial members of the Actinomycetales, Rhizobiales, and Xanthomonadales orders and of most fungal orders. Multivariate analysis showed correlations between microbial community structure and heavy metal and PAH concentrations over time, but also with edaphic parameters (C/N, pH, phosphorus, and nitrogen concentrations).

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Endophyte Effects on Nutrient Acquisition in Tall Fescue Grown in Andisols

Cited by 15 publications

References 38 publications

Response of Diploid Perennial Ryegrass to Fungal Endophyte AR29 Infections under Water Stress

Response of Diploid Perennial Ryegrass to Fungal Endophyte AR29 Infections under Water Stress

Effects of multiple climate change factors on the tall fescue–fungal endophyte symbiosis: infection frequency and tissue chemistry

The Bacterial and Fungal Diversity of an Aged PAH- and Heavy Metal-Contaminated Soil is Affected by Plant Cover and Edaphic Parameters

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