Endophyte-mediated adjustments in host morphology and physiology and effects on host fitness traits in grasses

Torres, Mónica S.; White, James F.; Zhang, Xin; Hinton, Dorothy M.; Bacon, Charles W.

doi:10.1016/j.funeco.2011.05.006

Cited by 85 publications

(49 citation statements)

References 70 publications

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“…This is supported by observations showing that endophytic bacteria of the genus Paenibacillus generate a metabolic signature (a recurrent change in the metabolic profile of plants after inoculation with the same strain in repeated experiments) when artifically inoculated in poplar plants (Scherling et al 2009). Surprisingly, other endophytic microorganisms (especially fungi) can also influence plant's metabolism by increasing the content of antioxidant compounds in the host and this seems to be a trademark for some types of endophytic symbiosis (Torres et al 2012). Thus, the metabolic signature might be a widespread characteristic in bacteria-plant interactions and especially in endophytic colonization.…”

Section: Introductionmentioning

confidence: 62%

“…Only a small set of investigations have pursued answering this issue and surprisingly, information on bacterial endophytes has been lagging behind that of their fungal counterparts. Traits activated during fungal colonization of plants have been extensively investigated and they are currently considered a fingerprint for the endophyte-plant association (Torres et al 2012).…”

Section: Discussionmentioning

confidence: 99%

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Grapevine colonization by endophytic bacteria shifts secondary metabolism and suggests activation of defense pathways

et al. 2015

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Aims The colonization pattern of three grapevine endop h y t e s ( f a m i l i e s S p h i n g o m o n a d a c e a e a n d Enterobacteriaceae) and their putative metabolic signature in plants were analyzed on Vitis vinifera L. cv. Pinot noir to determine the behavior of endophytic strains inside plants as well as how plants respond to such microsymbionts. Methods Strains Enterobacter ludwigii EnVs6, Pantoea vagans PaVv7 and Sphingomonas phyllosphaerae SpVs6, were root inoculated on micropropagated grapevine plantlets and colonization was determined by double labeling of oligonucleotide probes-fluorescence in situ hybridization (DOPE-FISH) coupled with confocal microscopy. After inoculation, the metabolic signature in plants colonized by Enterobacter ludwigii EnVs6 was further studied using UPLC//tandem mass spectrometry analysis.Results E. ludwigii EnVs6 and P. vagans PaVv7 colonized the plantlets and were both observed on the root surfaces and as endophytes in the cortex and inside the central cylinder up to xylem vessels, but not in the systemic plant parts. Strain SpVs6 also efficiently colonized the root surface, but not the endorhiza and was therefore not detected as an endophyte. A metabolic signature in plants inoculated with E. ludwigii EnVs6 was depicted, resulting in a significant increase in vanillic acid and a decrease in the concentration of catechin, esculin, arbutin, astringin, pallidol, ampelopsin, D-quadrangularin and isohopeaphenol. Changes in the concentration of epicatechin, procyanidin 1, taxifolin and the sum of quercetin-3-glucoside and quercetin-3-galactoside, in roots and stems were also detected, showing that the effect of colonization of plants is most prominent in the stems. Conclusions Colonization patterns in endophytes are divergent according to the strains used. A metabolic signature suggests the activation of pathways involved in plant defense but also modulation of the production of metabolites that are keys for colonization.

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Section: Introductionmentioning

confidence: 62%

Section: Discussionmentioning

confidence: 99%

Grapevine colonization by endophytic bacteria shifts secondary metabolism and suggests activation of defense pathways

et al. 2015

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“…This result suggests that CF containing IAA can improve the germination and growth of rice seeds (Keerthi and Jumpponen, 2014). The current study demonstrates that the application of CF to both normal and mutant rices stimulated seed growth, even in a mutant line with impaired hormonal biosynthesis (Nishijima et al, 1994;Torres et al, 2012). In conclusion, fungal endophytes isolated from medicinal plants growing in harsh environmental conditions comprise a community of diverse and biologically active endophytes.…”

Section: Discussionmentioning

confidence: 59%

Endophytes from medicinal plants and their potential for producing indole acetic acid, improving seed germination and mitigating oxidative stress

Khan

Gilani

Waqas

et al. 2017

J. Zhejiang Univ. Sci. B

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Abstract:Medicinal plants have been used by marginal communities to treat various ailments. However, the potential of endophytes within these bio-prospective medicinal plants remains unknown. The present study elucidates the endophytic diversity of medicinal plants (Caralluma acutangula, Rhazya stricta, and Moringa peregrina) and the endophyte role in seed growth and oxidative stress. Various organs of medicinal plants yielded ten endophytes, which were identified as Phoma sp. (6 isolates), Alternaria sp. (2), Bipolaris sp. (1), and Cladosporium sp. (1) based on 18S rDNA sequencing and phylogenetic analysis. The culture filtrates (CFs; 25%, 50%, and 100% concentrations) from these endophytes were tested against the growth of normal and dwarf mutant rice lines. Endophytic CF exhibited dose-dependent growth stimulation and suppression effects. CF (100%) of Phoma sp. significantly increased rice seed germination and growth compared to controls and other endophytes. This growth-promoting effect was due to the presence of indole acetic acid in endophytic CF. The gas chromatography/mass spectrometry (GC/MS) analysis showed the highest indole acetic acid content ((54.31±0.21) µmol/L) in Bipolaris sp. In addition, the isolate of Bipolaris sp. exhibited significantly higher radical scavenging and anti-lipid peroxidation activity than the other isolates. Bipolaris sp. and Phoma sp. also exhibited significantly higher flavonoid and phenolic contents. The medicinal plants exhibited the presence of bio-prospective endophytic strains, which could be used for the improvement of crop growth and the mitigation of oxidative stresses.

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“…Some of these endophytes are localised to specific tissue types and some are found systemically. The leaf endophytes of many grassy plant species, including barley ( Hordeum vulgare ) have been well studied and characterised (Arnold and Lutzoni 2007; Cheplick and Faeth 2009; Wang et al 2009; Torres et al 2012; de Souza Leite et al 2013). The endophytes of wild barley species have been less studied, particularly root endophytes.…”

Section: Introductionmentioning

confidence: 99%

Profundae diversitas: the uncharted genetic diversity in a newly studied group of fungal root endophytes

et al. 2015

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Endophytes associated with crops have potential as beneficial inoculants in agriculture, but little is known about their genetic diversity and phylogenetic relationships. We carried out the first ever ecological and phylogenetic survey of the culturable fungal root endophytes of a wild barley species. Fungal root endophytes were isolated from 10 populations of wall barley (Hordeum murinum), and 112 taxa of fungi were identified based on internal transcribed spacer sequence similarity. We found representatives from 8 orders, 12 families and 18 genera. Within this group, only 34 isolates (30% of the total) could be confidently assigned to a species, and 23 of the isolates (21% of the total) had no significant match to anything deposited in GenBank (based on <85% sequence similarity). These results suggest a high proportion of novel fungi, with 28% not assigned to a known fungal order. This includes three endophytes that have been shown to significantly improve agronomic traits in cultivated barley. This study has, therefore, revealed a profound diversity of fungal root endophytes in a single wild relative of barley. Extrapolating from this, the study highlights the largely unknown, hugely diverse and potentially useful resource of crop wild relative endophytes.

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Endophyte-mediated adjustments in host morphology and physiology and effects on host fitness traits in grasses

Cited by 85 publications

References 70 publications

Grapevine colonization by endophytic bacteria shifts secondary metabolism and suggests activation of defense pathways

Grapevine colonization by endophytic bacteria shifts secondary metabolism and suggests activation of defense pathways

Endophytes from medicinal plants and their potential for producing indole acetic acid, improving seed germination and mitigating oxidative stress

Profundae diversitas: the uncharted genetic diversity in a newly studied group of fungal root endophytes

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