Influence of water supply and endophyte infection (Neotyphodium spp.) on vegetative and reproductive growth of two Lolium perenne L. genotypes

Hesse, Uljana; Schöberlein, W.; Wittenmayer, Lutz; Förster, K.; Warnstorff, Kristina; Diepenbrock, W.; Merbach, W.

doi:10.1016/j.eja.2003.12.002

Cited by 47 publications

(28 citation statements)

References 21 publications

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“…The influence of endophytes on herbage and root biomass productivity has already been demonstrated in several hosts (Hesse et al 2005;Thom et al 2013;Mahendra et al 2014). However, most of those experiments were performed on grasses using clavicipitaceous fungi, especially Epichloë/Neotyphodium species.…”

Section: Discussionmentioning

confidence: 90%

“…This lack of consistency between experiments (Table 5) and this lack of strong influence of endophytes on quality traits of forage could be explained by our environmental conditions, which might not be the most suitable to prompt such an effect. It has frequently been reported that significant effects of fungal endophytes might occur only under particular conditions, such as drought stress (Hesse et al 2005) or high nutrient conditions (Newman et al 2003), or if the proper combination of endophyte species, host genotype and environmental conditions takes place (Ahlholm et al 2002).…”

Section: Discussionmentioning

confidence: 99%

“…Many studies have reported increases in biomass production and in re-growth capacity in endophyte-infected plants in comparison with uninfected ones (Hesse et al 2005;Thom et al 2013;Mahendra et al 2014). The nutrive value of Festuca rubra L., F. arundinacea Schreb.…”

Section: Introductionmentioning

confidence: 95%

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Biomass yield, nutritive value and accumulation of minerals in Trifolium subterraneum L. as affected by fungal endophytes

et al. 2015

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Background and aims Trifolium subterraneum is a legume species which is valuable for feeding livestock and frequently used as a forage crop in countries with temperate or Mediterranean-like climates. The aim of the present work was to evaluate the effect of six leaf fungal endophytes on biomass production, nutritive value and mineral status of T. subterraneum forage. Methods Plants were inoculated with each of seven treatments (six endophytes + control) at two different growth stages. After inoculation, two experiments (under greenhouse and field conditions) were established. Results Endophytes affected biomass yield, nutritive value and mineral status of T. subterraneum forage, but effects varied between experiments and depended on fungal species. E202 (Chaetosphaeronema sp.) increased forage productivity by around 80 % in the field. Fusarium lateritium and E244 (Pleosporales) reduced Al concentration, and Epicoccum nigrum reduced Pb of the forage in the greenhouse experiment. An increase in essential nutrients, such as Zn, was mainly produced by Stemphylium globuliferum. Conclusions This study demonstrated that inoculation with endophytes can increase forage productivity and help reduce potential nutrient deficiencies and/or potential mineral toxicity in T. subterraneum.

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Section: Discussionmentioning

confidence: 90%

Section: Discussionmentioning

confidence: 99%

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Biomass yield, nutritive value and accumulation of minerals in Trifolium subterraneum L. as affected by fungal endophytes

et al. 2015

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“…Apart from negative effects of endophyte alkaloids on herbivores, it has also been shown that endophytes can have beneficial effects on other plant fitness parameters e.g. improving drought and mineral stress tolerance (Malinowski et al 1998a;Amalric et al 1999;Malinowski and Belesky 2000;Hesse et al 2003Hesse et al , 2005, although the mechanisms responsible for these benefits remain largely unresolved. The host/fungal association has been viewed generally as mutualistic, though this concept has been challenged recently (Cheplick 2004;Saikkonen et al 2004Saikkonen et al , 2007Müller and Krauss 2005).…”

Section: Introductionmentioning

confidence: 99%

Metabolomics analysis of the Lolium perenne–Neotyphodium lolii symbiosis: more than just alkaloids?

2009

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Above ground plant parts of Lolium perenne often harbour endophytic Neotyphodium lolii fungi. These occur both naturally and commercially, as variant strains are introduced to modify the grass metabolic profile. They reside in the apoplastic spaces and rarely cause visible symptoms of infection. The vast majority of literature has focussed on the biosynthesis, accumulation, and ecological relevance of a limited number of alkaloids produced by N. lolii which have been shown to negatively affect insect pests and vertebrate herbivores. Much less is known about the effects of other metabolites in these interactions or the role of resource supply on metabolic profiles, nor critically on the metabolic consequences of differences in the amount (concentration) of endophyte present. Here, we provide a synthesis of some of our recently published studies on effects of resource supply (nitrogen, carbohydrates) on concentrations of endophytes and endophyte specific metabolites in the L. perenne-N. lolii association. We present results of both quantitative PCR and targeted metabolomics studies, using contrasting endophyte strains in two perennial ryegrass cultivars. We also present and discuss a hypothetical schematic representation of possible links between plant and fungal metabolic networks. A multiple regression analysis of numerical insect responses and metabolic profiles indicates that effects of endophyte infection on insect population sizes could be predicted by concentrations of a range of metabolites other than alkaloids and depended on insect species, fungal strain, and nitrogen supply.

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“…Considerable research efforts have been focused on the biosynthesis, accumulation, and ecological consequences of these fungal alkaloids (for review, see Clay and Schardl, 2002;Schardl et al, 2004). Much less is known about the impacts of fungal endophytes on other plant performance parameters and metabolism, although endophyte infection has been implicated in increasing drought and mineral stress tolerance (Malinowski et al, 1998b;Malinowski and Belesky, 2000;Hesse et al, 2003Hesse et al, , 2005. However, the general mutualistic nature of this particular type of plant-fungus association has been disputed (Saikkonen et al, , 2007Mü ller and Krauss, 2005) and it was shown that positive effects of the endophyte on plant performance depend on genetic variation in the host and endophyte, and on nutrient availability (Cheplick et al, 1989(Cheplick et al, , 2000Cheplick, 2004Cheplick, , 2007Hesse et al, 2004).…”

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confidence: 99%

Metabolic Profiles ofLolium perenneAre Differentially Affected by Nitrogen Supply, Carbohydrate Content, and Fungal Endophyte Infection

et al. 2008

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Lolium perenne cultivars differing in their capacity to accumulate water soluble carbohydrates (WSCs) were infected with three strains of fungal Neotyphodium lolii endophytes or left uninfected. The endophyte strains differed in their alkaloid profiles. Plants were grown at two different levels of nitrogen (N) supply in a controlled environment. Metabolic profiles of blades were analyzed using a variety of analytical methods. A total of 66 response variables were subjected to a principle components analysis and factor rotation. The first three rotated factors (46% of the total variance) were subsequently analyzed by analysis of variance. At high N supply nitrogenous compounds, organic acids and lipids were increased; WSCs, chlorogenic acid (CGA), and fibers were decreased. The high-sugar cultivar 'AberDove' had reduced levels of nitrate, most minor amino acids, sulfur, and fibers compared to the control cultivar 'Fennema', whereas WSCs, CGA, and methionine were increased. In plants infected with endophytes, nitrate, several amino acids, and, magnesium were decreased; WSCs, lipids, some organic acids, and CGA were increased. Regrowth of blades was stimulated at high N, and there was a significant endophyte 3 cultivar interaction on regrowth. Mannitol, a fungal specific sugar alcohol, was significantly correlated with fungal biomass. Our findings suggest that effects of endophytes on metabolic profiles of L. perenne can be considerable, depending on host plant characteristics and nutrient supply, and we propose that a shift in carbon/N ratios and in secondary metabolite production as seen in our study is likely to have impacts on herbivore responses.

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Influence of water supply and endophyte infection (Neotyphodium spp.) on vegetative and reproductive growth of two Lolium perenne L. genotypes

Cited by 47 publications

References 21 publications

Biomass yield, nutritive value and accumulation of minerals in Trifolium subterraneum L. as affected by fungal endophytes

Biomass yield, nutritive value and accumulation of minerals in Trifolium subterraneum L. as affected by fungal endophytes

Metabolomics analysis of the Lolium perenne–Neotyphodium lolii symbiosis: more than just alkaloids?

Metabolic Profiles ofLolium perenneAre Differentially Affected by Nitrogen Supply, Carbohydrate Content, and Fungal Endophyte Infection

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