The extent of mycorrhizal colonization of roots and its influence on plant growth and phosphorus content

Treseder, Kathleen K.

doi:10.1007/s11104-013-1681-5

Cited by 230 publications

(158 citation statements)

References 105 publications

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“…However, the AM plants were characterized by higher production of rosmarinic acid in roots and increased shoot and root dry weights in comparison to the nonmycorrhizal control. Our observations are contrary to these revealed by Treseder (2013) who found that species of the Funneliformis genus, in general, are the most effective in plant mass augmentation. Moreover, in another study by Toussaint et al (2007), even a relatively low level of colonization by F. mosseae (NBR1-2) had a considerable effect on Ocimum basilicum physiology (increased caffeic acid content in shoots).…”

Section: Discussioncontrasting

confidence: 99%

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Enhanced concentrations of elements and secondary metabolites in Viola tricolor L. induced by arbuscular mycorrhizal fungi

et al. 2015

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Background and Aims Viola tricolor L. (heartsease, wild pansy) is a valuable medicinal plant obtained for pharmaceutical purposes by cultivation. Given that the species is usually strongly colonized by arbuscular mycorrhizal fungi (AMF), we tested in a pot experiment whether these microorganisms were able to influence V. tricolor mass, vitality, and the concentrations of selected elements, phenolic acids and flavonoids. Methods The following treatments were prepared: (1) control: sterile soil without AMF inoculation; (2) Rhizophagus irregularis BEG144; (3) Funneliformis mosseae BEG12; and (4) both isolates. Using a combination of physiological, phytochemical and biophysical methods, we evaluated the effects of these AMF on the performance of heartsease. Results The intensity of mycorrhizal colonization and arbuscule formation was higher when F. mosseae and R. irregularis were introduced separately than when both isolates were present. None of the AMF treatments had an impact either on V. tricolor vitality as expressed by photosynthetic performance index (PI) or on its shoot and root mass. However, in general, a negative correlation was found between the extent of mycorrhizal colonization and shoot mass. We found AMF species specificities in their influence on element, phenolic acid and flavonoid concentrations. Viola tricolor showed no response to F. mosseae. The plants inoculated with R. irregularis had higher concentrations of P, Zn, Mg, and Ca, as well as p-hydroxybenzoic acid and rutin, in comparison to control. Dual AMF species inoculation increased concentrations of Cu, Mg and rutin. Conclusions The enhanced production of secondary metabolites in V. tricolor shoots may be due to improved mineral nutrition by AMF and/or a result of general plant defense reaction to fungal colonization. The tendency towards biomass decrease in AMF treatments could be explained by the allocation of plant carbon both to the maintenance of symbionts and enhanced production of secondary compounds.

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Section: Discussioncontrasting

confidence: 99%

“…A likely mechanism for this relationship is increased transfer of P and other nutrients through more abundant mycorrhizal structures (Smith and Read 2008;Treseder 2013). Consequently, the higher nutrient availability in AM plants might have contributed to the production of both Fig.…”

Section: Discussionmentioning

confidence: 99%

Enhanced concentrations of elements and secondary metabolites in Viola tricolor L. induced by arbuscular mycorrhizal fungi

et al. 2015

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“…In addition, mycorrhizal-induced growth depression in plants has been frequently observed (Jin et al 2017). AM fungi receive photosynthetic products from plant (Treseder 2013) and thus represent sink in the plants phloem transport, however in Table 2. Means (± standard deviation) and analysis of variance for length of the fine and coarse roots and root hair number and the length of AM-free (AMF) and AM-inoculated (AMI) wheat grown at 1 µmol/L (low) and 50 µmol/L (high) phosphorus (P) treatments P × AM * ns * ns *P < 0.05; **P < 0.01; ***P < 0.001; ns -non significant.…”

Section: Am Fungal Colonization and Root Traitsmentioning

confidence: 99%

Arbuscular mycorrhizae modify winter wheat root morphology and alleviate phosphorus deficit stress

Lazarević¹,

Lošák²,

Manschadi³

2018

PLANT SOIL ENVIRON

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Lazarević B., Lošák T., Manschadi A.M. (2018): Arbuscular mycorrhizae modify winter wheat root morphology and alleviate phosphorus deficit stress. Plant Soil Environ., 64: 47-52.Arbuscular mycorrhizal (AM) root colonization is known to have beneficial effects on plant growth especially under phosphorus (P) deficit conditions. The objectives of present study were: (i) to quantify changes in early wheat root development of AM-inoculated (AMI) and AM-free (AMF) roots under limited P availability; (ii) to assess possible mitigating effect of AM inoculation on photochemical efficiency under P deficit stress. AMI (inoculated with Rhizophagus irregularis) and AMF wheat plants were grown for 20 days in low (1 μmol/L) and high (50 μmol/L) P treatments. AM inoculation affected root morphology and shoot P concentration in low P treatment. AM inoculation alleviated reduction of the total root length in low P treatment, mainly due to an increase of fine roots length (< 0.5 mm). Contrastingly, shoot dry weight was reduced by AM inoculation in low P treatment. P deficiency decreased photochemical efficiency of wheat plants. However, due to increased sink capacity and facilitated nutrient concentrations AM inoculation alleviates phosphorus deficit stress and increased photochemical efficiency.

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“…1b). Fungi are the primary decomposers of dead wood 25 and so we estimated decomposer activity by measuring percentage fungal colonization of the wood blocks (Supplementary Methods), a metric equivalent to that used to estimate the functional role of mycorrhizal fungi 26 . If Hypothesis 1a holds, climate should largely explain fungal colonization and wood decomposition.…”

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Climate fails to predict wood decomposition at regional scales

et al. 2014

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Decomposition of organic matter strongly influences ecosystem carbon storage 1 . In Earth-system models, climate is a predominant control on the decomposition rates of organic matter [2][3][4][5] . This assumption is based on the mean response of decomposition to climate, yet there is a growing appreciation in other areas of global change science that projections based on mean responses can be irrelevant and misleading 6,7 . We test whether climate controls on the decomposition rate of dead wood-a carbon stock estimated to represent 73 ± 6 Pg carbon globally 8 -are sensitive to the spatial scale from which they are inferred. We show that the common assumption that climate is a predominant control on decomposition is supported only when local-scale variation is aggregated into mean values. Disaggregated data instead reveal that local-scale factors explain 73% of the variation in wood decomposition, and climate only 28%. Further, the temperature sensitivity of decomposition estimated from local versus mean analyses is 1.3-times greater. Fundamental issues with mean correlations were highlighted decades ago 9,10 , yet mean climate-decomposition relationships are used to generate simulations that inform management and adaptation under environmental change. Our results suggest that to predict accurately how decomposition will respond to climate change, models must account for local-scale factors that control regional dynamics.Climate is traditionally thought to be the predominant control on decomposition rates at global and regional scales, with biotic factors controlling only local rates 2,4 . Biotic factors are divided into decomposer organisms, such as soil microbes, and the quality (for example, chemical composition) of the plant litter they decompose. Recent work suggests that litter quality may be more important than climate in controlling decomposition rates across biomes worldwide 3,11 , but the influence of decomposer organisms is still assumed limited across broad climate gradients 12 . A core reason for this assumption is that climate is considered a primary control on the activity of decomposers. As such, across climate gradients, mean temperature and moisture availability are assumed to explain much of the variation in the activity of decomposer organisms and hence decomposition rates of organic matter. These climate-decomposition relationships are used to parameterize and evaluate Earth-system models 13 . It is therefore important to test the assumption that climate drives decomposer activities because proper understanding of these activities is needed to inform model projections such as carbon cycle-climate feedbacks 1,14 .Climate-decomposition relationships are typically developed from regional to global studies that use the mean response of decomposition to climate and litter quality drivers [2][3][4][5] . There is growing awareness in other areas of global change science that using mean responses masks the fine-scale variation required to understand effects of environmental change 6,7 , although the...

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The extent of mycorrhizal colonization of roots and its influence on plant growth and phosphorus content

Cited by 230 publications

References 105 publications

Enhanced concentrations of elements and secondary metabolites in Viola tricolor L. induced by arbuscular mycorrhizal fungi

Enhanced concentrations of elements and secondary metabolites in Viola tricolor L. induced by arbuscular mycorrhizal fungi

Arbuscular mycorrhizae modify winter wheat root morphology and alleviate phosphorus deficit stress

Climate fails to predict wood decomposition at regional scales

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