Phosphorus Uptake, Storage and Utilization by Fungi

Beever, Ross E.; Burns, D.J.W.

doi:10.1016/s0065-2296(08)60034-8

Cited by 213 publications

(134 citation statements)

References 366 publications

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“…Uptake rates of phosphate were calculated from the Michaelis-Menten equation assuming a single mechanism of uptake. However, both in plants and higher fungi at least two independently operating uptake systems may be active (Beever & Burns, 1980 ;Schachtman et al, 1998). Over the external concentration range used here, the high-affinity system for P i uptake contributes most to the uptake.…”

Section: mentioning

confidence: 94%

“…In semihydroponic systems, the partial retention of P in rapidly expanding fungal mycelia can result in a lower transfer of P into shoots of mycorrhizal pines, in particular under P limitation (Tables 1, 3 ; Cumming, 1996 ;Colpaert & Verstuyft, 1999). Phosphate uptake in plant and fungal cells is under biochemical control, a control that is probably mediated by the phosphorus status of the cells (Beever & Burns, 1980 ;Schachtman et al, 1998). In mycorrhizal root systems, phosphate absorption might be regulated by the intracellular P concentration of both mycobionts and root cells.…”

Section: mentioning

confidence: 99%

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Short‐term phosphorus uptake rates in mycorrhizal and non‐mycorrhizal roots of intact Pinus sylvestris seedlings

et al. 1999

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Short-term phosphate uptake rates were measured on intact ectomycorrhizal and non-mycorrhizal Pinus sylvestris seedlings using a new, non-destructive method. Uptake was quantified in semihydroponics from the depletion of P i in a nutrient solution percolating through plant containers. Plants were grown for 1 or 2 months after inoculation at a low relative nutrient addition rate of 3 % d −" and under P limitation. Four ectomycorrhizal fungi were studied : Paxillus involutus, Suillus luteus, Suillus bovinus and Thelephora terrestris. The P i -uptake capacity of mycorrhizal plants increased sharply in the month after inoculation. The increase was dependent on the development of the mycobionts. A positive correlation was found between the P i -uptake rates of the seedlings and the active fungal biomass in the substrate as measured by the ergosterol assay. The highest P i -uptake rates were found in seedlings associated with fungi producing abundant external mycelia. At an external P i concentration of 10 µM, mycorrhizal seedlings reached uptake rates that were 2.5 (T. terrestris) to 8.7 (P. involutus) times higher than those of non-mycorrhizal plants. The increased uptake rates did not result in an increased transfer of nutrients to the plant tissues. Nutrient depletion was ultimately similar between mycorrhizal and non-mycorrhizal plants in the semihydroponic system. Net P i absorption followed Michaelis-Menten kinetics : uptake rates declined with decreasing P i concentrations in the nutrient solution. This reduction was most pronounced in nonmycorrhizal seedlings and plants colonized by T. terrestris. The results confirm that there is considerable heterogeneity in affinity for P i uptake among the different mycobionts. It is concluded that the external mycelia of ectomycorrhizal fungi strongly influence the P i -uptake capacity of the pine seedlings, and that some mycobionts are well equipped to compete with other soil microorganisms for P i present at low concentrations in soil solution.

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Section: mentioning

confidence: 94%

Section: mentioning

confidence: 99%

Short‐term phosphorus uptake rates in mycorrhizal and non‐mycorrhizal roots of intact Pinus sylvestris seedlings

et al. 1999

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“…On the other hand, our carbon to nutrient ratios used for microbes (C : N = 18 and C : P = 250) may be high. Reported values of fungal C : P range from 70 to 632 (BEEVER and BURNS, 1980;WALLANDER et al, 2002;OLSSON et al, 2008), though none of the data are for aquatic hyphomycetes. Bacteria probably have higher phosphorus content (lower C : P) than fungi (STERNER and ELSER, 2002, suggested C : P < 27 for bacteria based on various reported studies), so a realistic C : P for the assemblage of microbes on decaying leaves is probably lower than that of fungi and generally lower than that of decaying leaves.…”

Section: Is There a Net Retention Or A Net Mineralization Of Nutrientmentioning

confidence: 99%

“…However, a few studies have observed limited elemental plasticity of aquatic bacteria (e.g., TEZUKA, 1990;CHRZANOWSKI and KYLE, 1996), and there is some evidence that fungi respond to low phosphorus by storing phosphorus in polyphosphate granules, reducing the phosphorus content of cell walls, and partially replacing phospholipid with phosphorus-free lipid (BEEVER and BURNS, 1980;JENNINGS, 1995).…”

mentioning

confidence: 99%

Nutrient Uptake and Mineralization during Leaf Decay in Streams – a Model Simulation

Webster

Newbold

Thomas

et al. 2009

International Review of Hydrobiology

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We developed a stoichiometrically explicit computer model to examine how heterotrophic uptake of nutrients and microbial mineralization occurring during the decay of leaves in streams may be important in modifying nutrient concentrations. The simulations showed that microbial uptake can substantially decrease stream nutrient concentrations during the initial phases of decomposition, while mineralization may produce increases in concentrations during later stages of decomposition. The simulations also showed that initial nutrient content of the leaves can affect the stream nutrient concentration dynamics and determine whether nitrogen or phosphorus is the limiting nutrient. Finally, the simulations suggest a net retention (uptake > mineralization) of nutrients in headwater streams, which is balanced by export of particulate organic nutrients to downstream reaches. Published studies support the conclusion that uptake can substantially change stream nutrient concentrations. On the other hand, there is little published evidence that mineralization also affects nutrient concentrations. Also, there is little information on direct microbial utilization of nutrients contained in the decaying leaves themselves. Our results suggest several directions for research that will improve our understanding of the complex relationship between leaf decay and nutrient dynamics in streams.

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“…As has been shown in many studies on phosphate transport, two separate uptake systems for phosphate appear to be present in fungi: a high-affinity system inducible at low external Pi concentrations and a low-affinity system formed constitutively (Burns & Beever, 1979;Beever & Burns, 1980). There is also circumstantial evidence that the kinetics of transport are dependent on the internal phosphorus content of the organism (Straker & Mitchel, 1987).…”

Section: Discussionmentioning

confidence: 96%

Phosphonate transport in Phytophthora capsici

1997

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Phosphate was shown to reverse the in vitro activity of phosphonate ions against P. capsici (strain 375) more efficiently in liquid than in solid media. Phosphonate transport by mycelia incubated in aqueous solutions was enhanced by a previous phosphate starvation and the presence of K þ cations. The intracellular phosphonate concentration reached a constant level and this concentration, which is a function of the external concentration, fits a hyperbolic relationship. Phosphonate transport was greatly stimulated when mycelia were incubated in modified Ribeiro's medium. In the absence of any phosphorus source in the growth medium, the phosphate content of mycelia at stationary phase of growth decreased. This sign of phosphate deficiency was intensified in the presence of phosphonate. INTRODUCTIONPhosphonate is known to be the systemicallymobile degradation product of the anti-oomycete fungicide fosetyl-Al (Bompeix & Saindrenan, 1984;Fenn & Coffey, 1984;Darakis et al., 1985). This anion was shown to be the active metabolite of the fungicide, since in both soil and plant tissues, fosetyl-Al breaks down rapidly to phosphonate (Smilie et al., 1988;Fenn & Coffey, 1989). Contrary to other systemic fungicides, phosphonate was shown to possess only weak direct activity against some species of Phytophthora despite its ability to control these pathogens in vivo (Guest, 1984(Guest, , 1986. In fact, phosphonate reduces the mycelial growth of several species of Phytophthora when applied directly during in vitro tests, but at concentrations generally higher than those achieved in phosphonate-or fosetyl-Al-treated plants Nemestothy & Guest, 1990). However, in Phytophthora species that are more sensitive in vitro, the phosphonate content of plant tissues could account for direct inhibition of fungal growth (Bompeix & Saindrenan, 1984;Darakis et al., 1985;Guest & Grant, 1991).Recent studies on the mode of action of phosphonate are orientated towards the possibility that the fungus is the primary target of the compound, whereas the plant's natural defence mechanisms have the main role in the inhibition of fungal growth, particularly in cases where species are more sensitive in vivo Guest & Grant, 1991;Barchietto et al., 1992). A number of studies have identified alterations to fungal metabolism Niere et al., 1990Niere et al., , 1994Barchietto et al., 1992) and changes of morphology (Jiang, 1990;Jiang & Grossmann, 1992). These changes might account for both direct fungal inhibition and modification of the interactions between host and parasite. It was suggested, therefore, that a perturbation of phosphorus metabolism may also affect the virulence mechanisms of the pathogen (Saindrenan et al., 1990;Smillie et al., 1990;Guest, 1995). However, little is known about the relationships between the direct and the indirect action. Furthermore, it was established that there is a phosphonate/phosphate antagonism within the fungal cell, since phosphate (Pi) sometimes reversed the antifungal action of phosphonate in in vitro tests (Bompeix & ...

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Phosphorus Uptake, Storage and Utilization by Fungi

Cited by 213 publications

References 366 publications

Short‐term phosphorus uptake rates in mycorrhizal and non‐mycorrhizal roots of intact Pinus sylvestris seedlings

Short‐term phosphorus uptake rates in mycorrhizal and non‐mycorrhizal roots of intact Pinus sylvestris seedlings

Nutrient Uptake and Mineralization during Leaf Decay in Streams – a Model Simulation

Phosphonate transport in Phytophthora capsici

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