Comparative effects of four mycorrhizal fungi on loblolly pine seedlings growing in a greenhouse in a Piedmont soil

Ford, Victor L.; Torbert, J. L.; Burger, James A.; Miller, Orson K.

doi:10.1007/bf02184293

Cited by 18 publications

(10 citation statements)

References 9 publications

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“…It can be seen in Table 3, that mycorrhizal seedlings absorbed more phosphorus than non-mycorrhizal ones. These results are in agreement with observations of other authors (Ford et al, 1985;Gagnon et al, 1987). However the differences in average P content in shoots between seedlings inoculated with various isolates were not significant statistically.…”

Section: Discussionsupporting

confidence: 83%

Effect of nitrogen level on acid phosphatase activity of eight isolates of ectomycorrhizal fungus Paxillus involutus cultured in vitro

Kieliszewska-Rokicka

1992

Plant Soil

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The higher levels of nitrogen in ammonium form stimulated the growth of mycelia and increased the accessible as well as the total acid phosphatase activity of Paxillus involutus (Batsch) Fr. isolates grown in pure culture. Rates of mycelia growth and acid phosphatase activities varied widely from one isolate to another. Scots pine (Pinus sylvestris L.) seedlings were inoculated with different P. involutus isolates in axenic conditions. Shoots of pine seedlings with mycorrhizae contained more phosphorus than shoots of non-mycorrhizal seedlings. The relations between growth and phosphatase activity of P. involutus isolates and their efficiency in supplying the host plant with phosphate are discussed.

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Section: Discussionsupporting

confidence: 83%

Effect of nitrogen level on acid phosphatase activity of eight isolates of ectomycorrhizal fungus Paxillus involutus cultured in vitro

Kieliszewska-Rokicka

1992

Plant Soil

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“…A few weeks after inoculation all short roots can be infected, meaning that seedlings can react rapidly to colonisation. Percentage colonisation by Tt and host growth responses are, however, reduced as the soil P concentration increases (Ford et al 1985;Jones et al 1990). In glasshouse trials, there are many reports of Tt-mediated growth responses compared with uninoculated control plants ( Thomas et al 1982;.…”

Section: Growth Responsesmentioning

confidence: 99%

“…There are several reports that Tt can increase foliar P, Nand K concentrations in seedlings compared with uninoculated controls or plants inoculated with some other ECM fungi (Thomas et al 1982;Ford et al 1985;Heslin and Douglas 1986;Coleman et al 1990). Rapid P uptake in Tt-colonised willow resulted in a significant increase in P concentration in shoots and roots during the first weeks of colonisation (Jones et al 1991).…”

Section: Nutritional Benefits To the Hostmentioning

confidence: 99%

Thelephora

Colpaert

1999

Ectomycorrhizal Fungi Key Genera in Profile

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“…Results of this type of experiment, however, may have little applicability to the soil environment where P uptake is limited by diffusion to the roots. Ford et al (1985) came closest to giving a full response curve in soil. Of four fungi tested on Pinus taeda, only Scleroderma aurantium gave a major growth response.…”

Section: Introduction Of Host Phosphate Have Been Shown Followingmentioning

confidence: 99%

Phosphorus relationships and production of extrametrical hyphae by two types of willow ectomycorrhizas at different soil phosphorus levels

1990

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SUMMARYThere is much circumstantial evidence for a role of increased P uptake in the growth response of plants to ectomycorrhizas. Full response curves with and without mycorrhizal infection along a P gradient in soil are, however, required to test this hypothesis fully. In this experiment, rooted cuttings of Salix viminalis L. cv. Bowles Hybrid were grown in a 1 :2 mixture by volume of gamma-irradiated soil and sterile sand, with bicarbonateextractable P concentrations of 4, 6, 10, 21, 60 or 90 mg P kg'^. The cuttings were inoculated by mixing peat/vermiculite spawn oiLaccariaproximo (Boud.) Pat., or Thelephora terrestris (Ehrh.) Fr., or autoclaved spawn 1: 5 by volume with the soil: sand mixture. The plants showed a positive growth response to mycorrhizal infection by either fungus at the two lower P levels, and to L. proximo only at 10 mg P kg'^ At 21 mg kg^^ and above, infection was reduced and neither mycorrhizal inoculation nor further P additions caused significant growth increases. These results imply that the growth responses to ectomycorrhizas in this experiment were solely due to increases in P uptake. Cuttings infected with L. proximo tended to be larger than those infected by T. terrestris. Estimates of percent mycorrhizal infection did not diflFer between the fungi at the lower P levels. However, overall production of extramatrical hyphae per gram of soil was highest in soil inoculated with L. proximo. At 10 mg P kg~i the length of L. proximo hyphae per unit length of mycorrhizal root, P uptake per unit root weight, and total P content in plants infected with L. proximo were significantly higher than for T. terrestris. This study confirms that increased P uptake can be an important component of growth stimulation by ectomycorrhizas. It also presents the first quantification of extramatrical ectomycorrhizal hyphae in soil and suggests a role for them m the growth response.

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Comparative effects of four mycorrhizal fungi on loblolly pine seedlings growing in a greenhouse in a Piedmont soil

Cited by 18 publications

References 9 publications

Effect of nitrogen level on acid phosphatase activity of eight isolates of ectomycorrhizal fungus Paxillus involutus cultured in vitro

Effect of nitrogen level on acid phosphatase activity of eight isolates of ectomycorrhizal fungus Paxillus involutus cultured in vitro

Thelephora

Phosphorus relationships and production of extrametrical hyphae by two types of willow ectomycorrhizas at different soil phosphorus levels

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