Infection by the fungal endophyte Epichloë bromicola enhances the tolerance of wild barley (Hordeum brevisubulatum) to salt and alkali stresses

Chen, Taixiang; Johnson, Richard D.; Chen, Shuihong; Lv, Hui; Zhou, Jingle; Li, Chunjie

doi:10.1007/s11104-018-3643-4

Cited by 56 publications

(49 citation statements)

References 61 publications

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“…The excessive accumulation of Na + in E− plants might cause tissue damage, resulting in more reductions in plant growth. Our results also supported the observations of higher Na + accumulation found in Aspergillus aculeatusfree tall fescue (Xie et al, 2019) and in other endophyte-free annual and perennial plants exposed to salinity stress (Li et al 2017;Xie et al 2017;Chen et al 2018;Sampangi-Ramaiah et al 2020). However, another study showed that endophyte infection did not affect Na + levels in the shoots of tall fescue and meadow fescue under salinity stress (Sabzalian and Mirlohi 2010 (Rozpądek et al 2015) and tomato (Solanum lycopersicum L.) plants (Azad and Kaminskyj 2016).…”

Section: Discussionsupporting

confidence: 91%

“…Endophyte-mediated plant responses to salinity stress have been extensively investigated in plant species, and the results are often inconsistent. Specifically, comparing to endophyte-free plants, endophyteinfected plants had higher plant growth rate, chlorophyll content, photosynthetic rate and efficiency, stomatal conductance and transpiration rate, antioxidant capacity, accumulations of hormone, proline and glycine betaine and K + and Ca 2+ , but lower electrolyte leakage and concentrations of H 2 O 2 , malondialdehyde (MDA), and Na + under salinity stress (Rozpądek et al 2015;Chen et al 2018;Ikram et al 2019;Gupta et al 2020). However, the stable stomatal conductance or transpiration rate was also found in endophyteinfected plants (Sampangi-Ramaiah et al 2020).…”

Section: Introductionmentioning

confidence: 99%

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Plant growth, ion accumulation, and antioxidant enzymes of endophyte-infected and endophyte-free tall fescue to salinity stress

et al. 2021

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Endophyte-mediated salinity tolerance is largely unknown in tall fescue [Schedonorus arundinaceus (Schreb.)]. The experiment was designed to characterize growth, ion accumulation, and antioxidant metabolism of tall fescue infected by the endophyte Epichloë coenophiala to different levels of salinity stress. Endophyte-infected (E +) and endophyte-free (E−) tall fescue (cv Kentucky 31) plants were exposed to 10 d of 0 (unstressed control), 100 and 200 mM NaCl treatments in a greenhouse, respectively. Salinity stress caused reductions in plant height, leaf fresh weight (LFW), leaf dry weight (LDW), and leaf water content (LWC), and increased Na + concentration, but E + plants had significantly higher LFW, LDW, and LWC under both NaCl treatments and lower Na + than E− plants under 200 mM NaCl. Salinity stress decreased K + and Mg 2+ and did not alter P, and increased Ca 2+ in E + plants and caused no change in Ca 2+ in E− plants; however, endophyte had no effects on these elements. Chlorophyll fluorescence (Fv/Fm), malondialdehyde (MDA) concentration, and activities of superoxide dismutase (SOD), catalase (CAT), and ascorbate peroxidase (APX) remained unchanged in E + plants, but Fv/Fm was reduced and MDA level and enzyme activities were elevated in E− plants under 200 mM NaCl, where E + plants had significantly higher Fv/Fm and lower MDA, SOD, and APX activities than E− plants. Peroxidase activities increased in E + plants under 200 mM NaCl and in E− plants under both NaCl treatments. The results indicated that endophyte promoted salinity tolerance in tall fescue through maintaining higher growth and photochemical efficiency and lowering Na + accumulation and lipid peroxidation. The significantly induced antioxidant enzyme activities and lipid peroxidation in E− plants suggested a possible enhanced oxidative injury in endophyte-free plants exposed to a high level of salinity stress.

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Section: Discussionsupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Plant growth, ion accumulation, and antioxidant enzymes of endophyte-infected and endophyte-free tall fescue to salinity stress

et al. 2021

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“…A beneficial effect of K accumulation in plants has also been reported for associations with arbuscular mycorrhiza (Langenfeld-Heyser et al, 2007) and Epichloë spp. (Chen et al, 2018). It is important to point out that the increase in biomass of L. perenne plants inoculated with Diaporthe strain S69 occurred not only during salt treatment but also in the tap water treatment.…”

Section: Discussionmentioning

confidence: 99%

“…In some grass-endophyte associations Epichloë species could play a key role in salt tolerance. In pot experiments Epichloë coenophiala increased the root biomass of tall fescue ( Schedonorus arundinaceous ) (Sabzalian and Mirlohi, 2010), and another Epichloë species increased the shoot and root biomass of wild barley ( Hordeum brevisubulatum ) under salinity stress (Song et al, 2015; Chen et al, 2018). In contrast, in FRP plants no significant effect of Epichloë on shoot dry weight was detected under salt treatment, although root growth or other parameters that could be affected by the presence of E. festucae under salinity were not analyzed (Zabalgogeazcoa et al, 2006).…”

Section: Discussionmentioning

confidence: 99%

A Survey of Culturable Fungal Endophytes From Festuca rubra subsp. pruinosa, a Grass From Marine Cliffs, Reveals a Core Microbiome

et al. 2019

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Festuca rubra subsp. pruinosa is a perennial grass that inhabits sea cliffs of the Atlantic coasts of Europe. In this unhospitable environment plants grow in rock crevices and are exposed to abiotic stress factors such as low nutrient availability, wind, and salinity. Festuca rubra subsp. pruinosa is a host of the fungal endophyte Epichloë festucae, which colonizes aerial organs, but its root mycobiota is unknown. The culturable endophytic mycobiota of FRP roots was surveyed in a set of 105 plants sampled at five populations in marine cliffs from the northern coast of Spain. In total, 135 different fungal taxa were identified, 17 of them occurred in more than 10% of plants and in two or more populations. Seven taxa belonging to Fusarium, Diaporthe, Helotiales, Drechslera, Slopeiomyces, and Penicillium appeared to be constituents of the core microbiome of Festuca rubra subsp. pruinosa roots because they occurred in more than 20% of the plants analyzed, and at three or more populations. Most fungal strains analyzed (71.8%) were halotolerant. The presence of Epichloë festucae in aboveground tissue was detected in 65.7% of the plants, but its presence did not seem to significantly affect the structure of the core or other root microbiota, when compared to that of plants free of this endophyte. When plants of the grass Lolium perenne were inoculated with fungal strains obtained from Festuca rubra subsp. pruinosa roots, a Diaporthe strain significantly promoted leaf biomass production under normal and saline (200 mM NaCl) watering regimes. These results suggest that the core mycobiome of Festuca rubra subsp. pruinosa could have a role in host plant adaptation, and might be useful for the improvement of agricultural grasses.

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“…However, studies on alkali stress have rarely been performed. Due to the high pH, alkaline salts (NaHCO 3 and/or Na 2 CO 3 ) have more destructive and complex effects on plants than that of salinization caused by neutral salts (NaCl and/or Na 2 SO 4 ) (Yang et al 2009, Hu et al 2015, Chen et al 2018). Alkali stress exhibits the same stress factors (ionic and osmotic stresses) as neutral salt stress, but becomes aggravated when combined with high pH stress (Yang et al 2009, Guo et al 2015).…”

Section: Introductionmentioning

confidence: 99%

Physiological and metabolomic responses of bermudagrass (Cynodon dactylon) to alkali stress

Wang

Feng

et al. 2020

Physiologia Plantarum

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Bermudagrass (Cynodon dactylon) is a widely used warm-season turfgrass species with superior stress tolerance except for cold. In this study, a comparative analysis of the responses to alkali stress in bermudagrass at the physiological and metabolomic levels were performed. Mild alkali with relatively low pH slightly inhibited growth of bermudagrass as evidenced by lower electrolyte leakage, more rapid growth and higher survival rate when compared to moderate and severe alkali treatments. Moreover, the amount of 37 metabolites including amino acids, organic acids, sugars and sugar alcohols were modulated by the alkali treatments. Among them, 15 metabolites were involved in carbon and amino acid metabolic pathways. Under mild alkali stress, bermudagrass possibly slowed down metabolisms to maintain basic growth. However, moderate and severe alkali-stressed plants accumulated significantly higher amount of carbohydrates which might result in carbon starvation. Taken together, alkali stress had severely inhibitory effect partially due to combined ionic stress and high pH stress. These results suggested that bermudagrass employed different strategies in response to alkali stresses with different pH and ionic values.

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Infection by the fungal endophyte Epichloë bromicola enhances the tolerance of wild barley (Hordeum brevisubulatum) to salt and alkali stresses

Cited by 56 publications

References 61 publications

Plant growth, ion accumulation, and antioxidant enzymes of endophyte-infected and endophyte-free tall fescue to salinity stress

Plant growth, ion accumulation, and antioxidant enzymes of endophyte-infected and endophyte-free tall fescue to salinity stress

A Survey of Culturable Fungal Endophytes From Festuca rubra subsp. pruinosa, a Grass From Marine Cliffs, Reveals a Core Microbiome

Physiological and metabolomic responses of bermudagrass (Cynodon dactylon) to alkali stress

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