Response to water deficit of Nothofagus dombeyi plants inoculated with a specific (Descolea antárctica Sing) and non-specific (Pisolithus tinctorious (Pers.) Coker &amp; Couch) ectomycorrhizal fungi

Alberdi, Miren; Álvarez, M.; Valenzuela, Eduardo; Godoy, Roberto; Olivares, Erick; Barrientos, Mónica

doi:10.4067/s0716-078x2007000400009

Cited by 8 publications

(4 citation statements)

References 39 publications

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“…In this work, the inoculation with P. tinctorius alone enhanced the contents of chl a, chl b, and carotenoids in C. sativa seedlings (respectively in 23%, 38%, and 27%, when compared to non-inoculated plants). These results are in accordance with those reporting chlorophyll concentration increases in ectomycorrhizal plants when compared with non-mycorrhizal plants (Huang and Tao 2004;Alberdi et al 2007). This situation is comparable to plants treated with P. tinctorius 30d + H. fasciculare, in which increases of 30% (chl a), 36% (chl b) and 20% (carotenoids) were detected, when compared to non-inoculated plants.…”

Section: Tinctoriussupporting

confidence: 91%

Effect of competitive interactions between ectomycorrhizal and saprotrophic fungi on Castanea sativa performance

et al. 2011

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In Northeast of Portugal, the macrofungal community associated to chestnut tree (Castanea sativa Mill.) is rich and diversified. Among fungal species, the ectomycorrhizal Pisolithus tinctorius and the saprotroph Hypholoma fasciculare are common in this habitat. The aim of the present work was to assess the effect of the interaction between both fungi on growth, nutritional status, and physiology of C. sativa seedlings. In pot experiments, C. sativa seedlings were inoculated with P. tinctorius and H. fasciculare individually or in combination. Inoculation with P. tinctorius stimulated the plant growth and resulted in increased foliar-N, foliar-P, and photosynthetic pigment contents. These effects were suppressed when H. fasciculare was simultaneously applied with P. tinctorius. This result could be related to the inhibition of ectomycorrhizal fungus root colonization as a result of antagonism or to the competition for nutrient sources. If chestnut seedlings have been previously inoculated with P. tinctorius, the subsequent inoculation of H. fasciculare 30 days later did not affect root colonization, and mycorrhization benefits were observed. This work confirms an antagonistic interaction between ectomycorrhizal and saprotrophic fungi with consequences on the ectomycorrhizal host physiology. Although P. tinctorius is effective in promoting growth of host trees by establishing mycorrhizae, in the presence of other fungi, it may not always be able to interact with host roots due to an inability to compete with certain fungi.

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Section: Tinctoriussupporting

confidence: 91%

Effect of competitive interactions between ectomycorrhizal and saprotrophic fungi on Castanea sativa performance

et al. 2011

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“…Regarding the possible relationship between nutrient concentration and osmolytes, none of the inoculations in this study improved the nutrient concentrations of seedlings; nevertheless, co-inoculation caused an osmotic adjustment, which could have occurred because of Pisolithus tinctorius or possibly because of the synergistic effect of both inocula. In contrast, other authors [35] did not observe any osmotic effect of Pisolithus tinctorius in other forest species.…”

Section: Resultsmentioning

confidence: 60%

Effects of Pseudomonas fluorescens on the Water Parameters of Mycorrhizal and Non-Mycorrhizal Seedlings of Pinus halepensis

et al. 2013

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Inoculation of forest seedlings with mycorrhizal fungi and rhizobacteria can improve the morphological and physiological qualities of plants, especially those used for regeneration of arid areas. In this paper, under standard nursery conditions, Aleppo pine seedlings were inoculated with Pseudomonas fluorescens CECT 5281 rhizobacteria. Some of these seedlings were also inoculated with the ectomycorrhizal fungus Pisolithus tinctorius. Five months after the inoculations, we examined the growth, water parameters (osmotic potential at full turgor [Ψπfull], osmotic potential at zero turgor [Ψπ0], and the tissue modulus of elasticity near full turgor [Emax]), mycorrhizal colonisation, and concentration of macronutrients (N, P, K, Ca and Mg) in the seedlings. Subsequently, a trial was conducted to assess the root growth potential. P. fluorescens CECT 5281 decreased the cellular osmotic potential of P. halepensis seedlings but increased its elasticity. P. tinctorius + P. fluorescens caused osmotic adjustment at zero turgor and increased tissue elasticity, which improved tolerance to water stress. All inoculations improved the growth and nutrition of the seedlings but caused non-significant effects on root growth potential. The co-inoculation Pisolithus tinctorius + Pseudomonas fluorescens at the nursery may be a suitable technique for producing improved seedling material for restoration purposes

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“…Previous observations indicate that fungal plant colonization increases the carbohydrate flux through the TCA cycle, enabling a strong carbohydrate sink at the plant–fungus interface (Nehls 2008). The positive effect of ectomycorrhizal colonization on carbon (C) production in the roots of N. dombeyi under drought has also been observed in our previous study (Alberdi et al 2007). Hence, increased GDH production could potentially be an ectomycorrhizal‐based mechanism to enhance C availability under drought stress conditions.…”

Section: Discussionmentioning

confidence: 99%

Ectomycorrhizal fungi enhance nitrogen and phosphorus nutrition of Nothofagus dombeyi under drought conditions by regulating assimilative enzyme activities

Álvarez

Huygens

Olivares

et al. 2009

Physiologia Plantarum

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Drought stress conditions (DC) reduce plant growth and nutrition, restraining the sustainable reestablishment of Nothofagus dombeyi in temperate south Chilean forest ecosystems. Ectomycorrhizal symbioses have been documented to enhance plant nitrogen (N) and phosphorus (P) uptake under drought, but the regulation of involved assimilative enzymes remains unclear. We studied 1-year-old N. dombeyi (Mirb.) Oerst. plants in association with the ectomycorrhizal fungi Pisolithus tinctorius (Pers.) Coker & Couch. and Descolea antartica Sing. In greenhouse experiments, shoot and root dry weights, mycorrhizal colonization, foliar N and P concentrations, and root enzyme activities [glutamate synthase (glutamine oxoglutarate aminotransferase (GOGAT), EC 1.4.1.13-14), glutamine synthetase (GS, EC 6.3.1.2), glutamate dehydrogenase (GDH, EC 1.4.1.2-4), nitrate reductase (NR, EC 1.6.6.1), and acid phosphomonoesterase (PME, EC 3.1.3.1-2)] were determined as a function of soil-water content. Inoculation of N. dombeyi with P. tinctorius and D. antartica significantly stimulated plant growth and increased plant foliar N and P concentrations, especially under DC. Ectomycorrhizal inoculation increased the activity of all studied enzymes relative to non-mycorrhizal plants under drought. We speculate that GDH is a key enzyme involved in the enhancement of ectomycorrhizal carbon (C) availability by fuelling the tricarboxylic acid (TCA) cycle under conditions of drought-induced carbon deficit. All studied assimilative enzymes of the ectomycorrhizal associations, involved in C, N, and P transfers, are closely interlinked and interdependent. The up-regulation of assimilative enzyme activities by ectomycorrhizal fungal root colonizers acts as a functional mechanism to increase seedling endurance to drought. We insist upon incorporating ectomycorrhizal inoculation in existing Chilean afforestation programs.

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Response to water deficit of Nothofagus dombeyi plants inoculated with a specific (Descolea antárctica Sing) and non-specific (Pisolithus tinctorious (Pers.) Coker & Couch) ectomycorrhizal fungi

Cited by 8 publications

References 39 publications

Effect of competitive interactions between ectomycorrhizal and saprotrophic fungi on Castanea sativa performance

Effect of competitive interactions between ectomycorrhizal and saprotrophic fungi on Castanea sativa performance

Effects of Pseudomonas fluorescens on the Water Parameters of Mycorrhizal and Non-Mycorrhizal Seedlings of Pinus halepensis

Ectomycorrhizal fungi enhance nitrogen and phosphorus nutrition of Nothofagus dombeyi under drought conditions by regulating assimilative enzyme activities

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