Translocation of solutes along rhizomorphs of Armillaria mellea

Granlund, H. I.; Jennings, David; Thompson, W. A.

doi:10.1016/s0007-1536(85)80224-2

Cited by 55 publications

(52 citation statements)

References 19 publications

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“…(Granlund et al, 1985) for '"C, ^'P and ^'K. Here we have demonstrated that translocation of '''C within P. velutina cord systems may occur, reproducibly, at velocities more than ten times previously published estimates.…”

Section: S C L' S S T O Nsupporting

confidence: 70%

“…This difference may be at least partly due to the sensitivity of the radioisotope assay. Brownlee & Jennings (1982 a) and Granlund et al (1985) either determined radioactivity non-destructively, by means of probes above the mycelium, or added excised segments of mycelium directly to scintillant. In both cases sample self-absorption was assumed to be negligible.…”

Section: S C L' S S T O Nmentioning

confidence: 99%

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Carbon translocation in mycelial cord systems of Phanerochaete velutina (DC: Pers.) Parmasto

1995

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U M M A R ^'Movement of r'acUotr-acer w-as monitored in niyeelial cord systems developed from wood bloek inoeula, preeolonized hy Plianeroehaete velutina (DC: Pers.) Parmasto grown on unsterile soil. In short-term .studies, reproducihle but low-level loading of radiotracer was observed which was independent of the extent of cord systems. Carbon transloeation velocities ranged from 132 to 336 cm h"', whilst fluxes were estimated to range frotn 35 to 66 nmol ctn -h ' (as glueose). When eord systems were supplied with a range of potential earbon resources as baits considerable movement of carbon was detected over 9 wk. More than 80% of exogenously supplied carbon was retained in resource units rather than being allocated to extra-resource mycelium. The direction and extent of carbon movement, and partitioning of decay between inoeula and baits within cord systems, was dependent upon the type and size of bait and whether or not combinations of baits ineluded wood pre-eolonized by other saprotrophie fungi. There was evidence for coordinated use of resources within cord systetiis and that earbon movement was not a funetion of myeelial growth. Respiratory carbon losses were greatest when baits ineluded sterile leaf litter packs and least when sterile wood haits were supplied. The results are discussed in terms of nutrient eonservation and eyeling in eord systems.

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Section: S C L' S S T O Nsupporting

confidence: 70%

Section: S C L' S S T O Nmentioning

confidence: 99%

Carbon translocation in mycelial cord systems of Phanerochaete velutina (DC: Pers.) Parmasto

1995

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“…To date, studies of translocation in cord-forming and rhizomorph-forming basidiomycetes have focused on either the mechanism or the ecological significance of the process. Based on estimates of translocation velocity\flux, the use of metabolic inhibitors and the presence or absence of a defined translocation front in cords of several mycorrhizal fungi, Serpula lacrimans (the dry-rot fungus of buildings), the rhizomorph-forming tree pathogen Armillaria mellea and woodland saprotrophs, the mechanism of translocation has been variously attributed, wholly or partly, to mass flow (Brownlee & Jennings, 1981, 1982Granlund, Jennings & Thompson, 1985 ;Jennings, 1987 ;Cairney, 1992), cyclosis (Finlay & Read, 1986), evapotranspiration or active transport (Timonen et al, 1996).…”

Section: mentioning

confidence: 99%

Wood decay and phosphorus translocation by the cord‐forming basidiomycete Phanerochaete velutina: the significance of local nutrient supply

Wells¹,

Boddy²,

Donnelly³

1998

New Phytologist

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Mycelial cord systems of Phanerochaete velutina (DC. : Pers.) Parmasto grown from 4 cm$ inocula on a nutrientdepleted non-sterile soil in compartmentalized laboratory microcosms were baited after 13 d of growth with either fresh, non-sterile 4 cm$ wood blocks or control Perspex2 blocks of the same contact area. After 112 d, mature mycelial systems, which were in senescent phase, were subjected to disturbance by supplying a new fresh wood bait diametrically opposite the existing bait and, after 126 d, to nutrient regime amendment by application of NPK solution. At harvest (186 d) there was a significant (P 0n001) linear relationship between extra-resource mycelial biomass and total wood decay over the preceding 74 d. Nutrient amendment alone did not significantly (P 0n05) affect extra-resource mycelial biomass production or wood decay rates in either disturbed or undisturbed cord systems. However, both mycelial biomass production and resource decay were significantly (P 0n05) enhanced when nutrient amendment and disturbance treatments were applied concurrently. Bi-directional phosphorus translocation to inocula and wood baits (determined non-destructively) was assessed by labelling the NPK solution applied distal or proximal to the initially supplied bait with $#P. In both disturbed and undisturbed cord systems the rate of $#P uptake from a local supply was two orders of magnitude higher than from a distal supply. In disturbed cord systems uptake of $#P by inocula, which were midway between the two radiotracer supply points, was significantly (P 0n05) higher when the supply point contained a newly supplied wood bait. Net translocation of $#P to newly supplied wood baits increased with time at the expense of translocation to inocula and existing wood baits. The switch in direction of net phosphorus translocation, the importance of localized nutrient scavenging and the partitioning of wood decay are discussed in relation to the ecological significance of mycelial cords.

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“…[^HJglucose, ['""Clglucose and [^^P]orthophosphate appear to be translocated along rhizomorphs iti 7'iiro by a mechanism other than diffusion. Both acropetal and basipetal translocation of [''HJglucose have been observed (Granlund, Jennings & Thompson, 1985). Application of radiotracer techniques to study translocation through fungal rhizomorphs or cords m the field has proved less successful.…”

mentioning

confidence: 99%

The physiology of basidiomycete linear organs

Gray

Dighton²,

Jennings

1996

New Phytologist

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S L! M M A R yAuto radiography and quantitative image analysis were used to measure ^^'Cs distribution and translocation through mycelia of A. galHca Marxmuller & Ronnagn, and A. ostoyae (Romagn,) Herink growing in small microcosms in the laboratory, Rhizomorphs of .4.ga///c<3 were labelled with '*''*Cs in the field, and the translocation of radiolabel measured after excavation and destructi\'e harvesting. The flux of radiocaesium through rhizomorphs was estimated to be greater than through undifferentiated hyphae, and greater through rhizomorphs growing in tbe field tban through rbiisomorphs grown across homogeneous media in tbe laboratory. Differentiation witbin mycelia resulting in melanization or rhizomorph formation gave rise to increased heterogeneity in tbe ^^'Cs distribution through laboratory microcosms compared with that through microcosms containing undifferentiated mycelia. Radiocaesium leaked from undifferentiated hyphae into the surrounding medium, but melanized regions of the mycelium appeared to be eonservative for radiocaesium, Tbese findings provide further evidence for the importance of filamentous fungi in determining the distribution and rate of release of radiocaesium currently present in the environment as a result of weapons testing and the accident at the Chernobyl nuclear reactor.

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Translocation of solutes along rhizomorphs of Armillaria mellea

Cited by 55 publications

References 19 publications

Carbon translocation in mycelial cord systems of Phanerochaete velutina (DC: Pers.) Parmasto

Carbon translocation in mycelial cord systems of Phanerochaete velutina (DC: Pers.) Parmasto

Wood decay and phosphorus translocation by the cord‐forming basidiomycete Phanerochaete velutina: the significance of local nutrient supply

The physiology of basidiomycete linear organs

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