Organic nitrogen utilization by an unidentified mycobiont isolated from mycorrhizas of Pisonia grandis

The ability of an unidentified mycobiont from Pisonia grandis mycorrhizas to utilize organic nitrogen and phosphorus sources was determined in axenic liquid cultures. The fungus utilized inorganic phosphate and both freely- and poorly-soluble salts of inositol hexaphosphate as sole phosphorus sources. With the exception of uric acid which did not support growth, the yield of the mycobiont on all organic nitrogen sources tested was significantly greater than the yield on either NH 4 + or NO 3 − . It is suggested that the major ecological role of the Pisonia mycobiont in stands of P. grandis on coral cays may be rapid absorption of allantoin and urea produced during degradation of uric acid by the spil microflora. This may be important in retaining nitrogen in the soil: plant system prior to loss from the coral cay by further degradation, volatilization and/or leaching.

[1]  J. Cairney,et al.  Influence of intracellular phosphorus concentration on phosphate absorption by the ectomycorrhizal basidiomycete Pisolithus tinctorius , 1992 .

[2]  J. Raven.  Acquisition of nitrogen by the shoots of land plants: its occurrence and implications for acid-base regulation , 1988 .

[3]  A. E. Linkins,et al.  The effects of organic and inorganic phosphorus concentration on the acid phosphatase activity of ectomycorrhizal fungi , 1988 .

[4]  W. Bowden.  Gaseous nitrogen emmissions from undisturbed terrestrial ecosystems: An assessment of their impacts on local and global nitrogen budgets , 1986 .

[5]  D. Read,et al.  THE ROLE OF PROTEINS IN THE NITROGEN NUTRITION OF ECTOMYCORRHIZAL PLANTS. I. UTILIZATION OF PEPTIDES AND PROTEINS BY ECTOMYCORRHIZAL FUNGI , 1986 .

[6]  D. Read,et al.  The role of proteins in the nitrogen nutrition of ectomycorrhizal plants. III: Protein utilization by Betula, Picea and Pinus in mycorrhizal association with Hebeloma crustuliniforme , 1986 .

[7]  A. Ashford,et al.  TRANSFER CELLS AND HARTIG NET IN THE ROOT EPIDERMIS OF THE SHEATHING MYCORRHIZA OF PISONIA GRANDIS R. BR. FROM SEYCHELLES , 1985 .

[8]  H. Lindeboom.  The Nitrogen Pathway in a Penguin Rookery , 1984 .

[9]  A. Ashford,et al.  A SHEATHING MYCORRHIZA ON PISONIA GRANDIS R. BR. (NYCTAGINACEAE) WITH DEVELOPMENT OF TRANSFER CELLS RATHER THAN A HARTIG NET , 1982 .

[10]  D. Read,et al.  Utilization of inorganic and organic phosphates by the mycorrhizal endophytes of Vaccinium macrocarpon and Rhododendron ponticum , 1981 .

[11]  T. Cooper,et al.  Induction and inhibition of the allantoin permease in Saccharomyces cerevisiae , 1978, Journal of bacteriology.

[12]  G. Vogels,et al.  Degradation of purines and pyrimidines by microorganisms , 1976, Bacteriological reviews.

[13]  D. Marx,et al.  Growth and Ectomycorrhizal Development of Loblolly Pine Seedlings in Fumigated Soil Infested with the Fungal Symbiont Pisolithus tinctorius , 1975 .

[14]  T. Cooper,et al.  Urea transport in Saccharomyces cerevisiae , 1975, Journal of bacteriology.

[15]  F. Fosberg.  Description and occurrence of atoll phosphate rock in Micronesia , 1957 .

[16]  J. Cairney,et al.  A basidiomycete isolated from a Pisonia mycorrhiza forms sheathing mycorrhizas with transfer cells on Pisonia grandis R. Br. , 1994 .

[17]  Å. Frostegård,et al.  Utilization of organic and inorganic nitrogen sources by ectomycorrhizal fungi in pure culture and in symbiosis with Pinus contorta Dougl. ex Loud. , 1992 .

[18]  D. Read,et al.  Amino acids as nitrogen sources for ectomycorrhizal fungi: Utilization of individual amino acids , 1988 .

[19]  A. Ashford,et al.  Nutrient input by seabirds to the forest on a coral island of the Great Barrier Reef , 1984 .

[20]  G. L. Terman.  Volatilization Losses of Nitrogen as Ammonia from Surface-Applied Fertilizers, Organic Amendments, and Crop Residues , 1980 .

[21]  J. Stemmerik.  Florae Malesianae Precursores XXXVIII. Notes on Pisonia L. in the Old World (Nyctaginaceae) , 1964 .

[22]  H. K. A. Shaw.  On the Distribution of Pisonia grandis R. BR. (Nyctaginaceae), with Special Reference to Malaysia , 1952 .

[23]  H. John.  THE DISTRIBUTION OF « PISONIA GRANDIS » (NYCTAGINACEAE) , 1951 .