Carbon and phosphorus relations in mycorrhizal and non-mycorrhizal pine seedlings

Rousseau, J. V. D.; Reid, C. P. P.

doi:10.1051/forest:198905art0157

Cited by 4 publications

(3 citation statements)

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“…Mycorrhizal infection often leads to increased rates of photosynthesis (Guehl et al, 1990;Wallander, 1992) owing either to increased P and N uptake Rousseau & Reid, 1989 or to non-nutritional effects of certain mycorrhizal fungi (Nylund & Wallander, 1989;Dosskey, Linderman & Boersma, 1990). The levels of rootborne plant hormones, e.g.…”

Section: Introductionmentioning

confidence: 99%

Growth and mineral nutrition of non‐mycorrhizal and mycorrhizal Norway spruce (Picea abies) seedlings grown in semi‐hydroponic sand culture

Eltrop

Marschner

1996

New Phytologist

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S U M M A R YIn seedlings of Norway spruce {Picea abies (L.) Karst.), grown in semi-hydroponic sand culture, mycorrhizal infection decreased grow-th (Eltrop & Marschner, 1996). Possible reasotis for this growth depression were investigated in the present study by comparing the plant and fungal biomass distribution and carbon partitioning between non-mycorrhizal and mycorrhizal {Pisolithus tinctorius) plants supplied with ammonium or nitrate as source of N.Despite the high mycorrhizal infection rate (55-71 '\, of total root tips), the amount of fungal btomass in roots and extramatrical mycelium of mycorrhizal plants accounted for less than 3°o of plant dry matter and was significantly lower in nitrate-than in ammonium-supplied plants.The CO., assimilation rates were higher in mycorrhizal thari in non-mycorrhizal plants supplied with ammonium as well as those supplied with nitrate. High light intensity considerably increased CO., assimilation rates. The respiration rates of the intact root systems were significantly increased in ammonium-supplied mycorrhizal plants compat-ed with non-mycorrhizal plants. The amount of CO., lost in root respiration as a percentage of the amount of CO., gained in photosynthesis (respiratory quotient), ranged from 49-3 "o at 30 °C root zone temperature and low light intensity (290/(mol m"'s"') to ll-7"o at 10 °C and high light intensity (990//mol m~" s"'). In ammonium-supplied plants grown at 22 °C and low light intensity, the proportion of carbon lost by root respiration was significantly higher in mycorrhizal than in non-m\xorrhizal plants. This increase in root respiration was of the same order of magnitude (7-4 "o) as the decrease in dry matter production by mycorrhizal plants (10-1 °"). In nitrate-supplied plants, no significant difference in the respiratory quotient was found between non-mycorrhizal and mycorrhizal plants. The respiration rate per unit d. wt of the fungal mycelium was estimated to account for 31-3 °o (ammonium supply) and 8-3 "o (nitrate supply) of that of the total mycorrhizal root system although the dry weight accounted for only 4-0 "" (ammonium supply) and 2-5 °o (nitrate supply). Accordingly, the respiration rate was calculated to be 11-1 times higher with ammonium supply, and 3-4 times higher with nitrate supply, than that of the root tissue. The carbohydrate coi-icentrations in shoots and roots were not consistently different between non-mycorrhizal and mycorrhizal plants.It was concluded that increased root respiration was mainly responsible for the growth reduction in mycorrhizal compared with non-mycorrhizal plants, whereas the production of fungal biomass in the extramatrical t-nycelium of mycorrhizal plants was of minor importance.

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Section: Introductionmentioning

confidence: 99%

Growth and mineral nutrition of non‐mycorrhizal and mycorrhizal Norway spruce (Picea abies) seedlings grown in semi‐hydroponic sand culture

Eltrop

Marschner

1996

New Phytologist

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“…Es decir, mientras en septiembre el incremento de la transpiración en planta micorrizada parece deberse a mejoras en la captación hídrica, el incremento en planta micorrizada de la fotosíntesis en julio y octubre se debe a otros factores, como la mejor asimilación de fósforo (Rousseau & Reid, 1990), o un posible cambio hormonal sobre la regulación de la apertura de los estomas (Coleman et al, 1990;Duan et al, 1996;Ebel et al, 1997) originado por la micorrización.…”

Section: Intercambio Gaseoso Y Potencial Hídricounclassified

“…El mecanismo por el cual el hongo micorrícico modifica las relaciones hídricas de la planta huésped es poco conocido. Entre las diversas hipótesis que se plantean para justificar esta influencia están: el efecto indirecto de la mejora nutricional de fósforo en planta micorrizada (Rousseau & Reid, 1990); la mejora de la captación de agua en sistemas radicales micorrizados bien por adición de una fase extrarradical miceliar (Ruiz-Lozano y Azcón, 1995), por incremento efectivo de la conductancia hidráulica (Safir et al, 1971;Nardini et al, 2000), o por modificación de la arquitectura radical (Daniels Hetrick et al, 1988;Kothari et al, 1990;Miller et al, 1997); también los cambios hormonales (Coleman et al, 1990;Duan et al, 1996;Ebel et al, 1997) o la inducción a la osmorregulación (Augé et al, 1986) pueden modificar las relaciones hídricas de la planta micorrizada.…”

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The influence of the mycorrhization with black truffle in growth, gas exchange and mineral nutrition of Pinus halepensis

et al. 2004

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Influence of Tuber melanosporum Vitt mycorrhization in plant quality of Pinus halepensis Mill. was assessed from June to November during first nursery year. Seedlings were regularly watered. Mycorrhization causes increment in height, diameter, root and aerial weights, and number of root shoots induced. Mycorrhized plants showed both higher phosphorous and lower calcium concentration levels. Under water availability, influence of mycorrhization on water potential of the plant is not well defined, although both photosynthetic and transpiration rates occasionally increased.

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Pisolithus

Chambers¹,

Cairney²

1999

Ectomycorrhizal Fungi Key Genera in Profile

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Carbon and phosphorus relations in mycorrhizal and non-mycorrhizal pine seedlings

Cited by 4 publications

References 0 publications

Growth and mineral nutrition of non‐mycorrhizal and mycorrhizal Norway spruce (Picea abies) seedlings grown in semi‐hydroponic sand culture

Growth and mineral nutrition of non‐mycorrhizal and mycorrhizal Norway spruce (Picea abies) seedlings grown in semi‐hydroponic sand culture

The influence of the mycorrhization with black truffle in growth, gas exchange and mineral nutrition of Pinus halepensis

Pisolithus

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