• Abuarghub, S. M. & Read, D. J. (1988) The biology of mycorrhiza in the Ericaceae. XII. Quantitative analysis of individual ‘free’ amino acids in relation to time mid depth in the soil profile. New Phytologist 108, 433441.
  • Aoyagi, T., Kunimoto, S., Morishima, H., Takeuchi, T. & Umezawa, H. (1971) Effect of pepstatin on acid proteases. Journal of Antibiotics 24, 687694.
  • Bajwa, K., Abuarghub, S. & Read, D. J. (1985) The biology of mycorrhiza in the Ericaceae. X. The utilization of proteins and the production of proteolytic enzymes by the the mycorrhizal endophyte and by mycorrhizal plants. New Phytologist 101, 469486.
  • Bajwa, R. & Read, D. J. (1985) The biology of mycorrhiza in the Ericaceae. IX. Peptides as nitrogen sources for the ericoid endophyte and for mycorrhizal and non-mycorrhizal plants. New Phytologist 101, 459467.
  • Burrns, R. G. (1983) Extracellular enzyme-substrate interactions in soil. Symposia of The Society For General Microbiology 34, 249298.
  • Chaloupka, J., Obdrzálek, V., Krecková, P., Nesmeyanova, M. A. & Zalabak, V. (1975) Protease activity in cells of Bacillus megaterium during derepression. Folia Microbiologica 20, 277288.
  • Chang, W., Horiuchi, S., Takahasi, K., Yamasaki, M. & Yamada, Y. (1976) The structure and function of acid proteases. VI. Effects of acid protease-specific inhibitors on the acid proteases from Aspergillus niger var. macrosporus. Journal of Biochemistry 80, 975981.
  • Dixon, M. S; Webb, E. C. (1979) Enzymes, 3rd Edition (assisted by C. J. R.Thorne & K. F.Tipton). Longmans, London .
  • Farr, D. R., Horisburger, M. & Jolles, P. (1984) An extracellular rennin-like enzyme produced by Physarum polycephalum. Biochimica et Biophysica Acta 334, 410416.
  • Fruton, J.S. (1971) Pepsin, in: The Enzymes (Ed, by P. D.Boyer), vol. III, 3rd Edition, pp. 119164. Academic Press, New York , London .
  • Fukumoto, J., Tsuru, D. & Yamamoto, T. (1967) Studies on mold protease. Part I. Purification, crystallisation, and some enzymic properties of acid protease of Rhizopus chinensis. Agricultural and Biological Chemistry {Tokyo) 31, 710717.
  • Hewitt, E. J. (1966) Sand and Water Culture Methods Used in The Study of Plant Nutrition. Technical communication, 22. Commonwealth Agricultural Bureaux, London.
  • Ichishima, E. & Yoshida, F. (1965) Chromatographic purification and physical homogeneity of Acid proteinase of Aspergillus saitoi. Biochemica et Biophysica Acta 90, 360366.
  • Ladd, J. N. & Butler, J. H. A. (1972) Short-term assays of soil proteolytic enzyme activities using proteins and dipeptide derivatives as substrates. Soil Biology and Biochemistry 4, 1930.
  • Matsubara, H. & Feder, J. (1971) Other bacterial, mold and yeast propteases. In: The Enzymes, Vol. III, Hydrolysis : Peptide Bonds (Ed. By P. D.Boyer) pp. 721795. Academic Press, New York , London .
  • McLaren, A. D. & Skujins, J. (1968) The physical environment of microorganisms in soil. In: The Ecology of soil bacteria (Ed. By T. R. G.Gray & D.Parkinson), pp. 324. Liverpool University press.
  • Nanipieri, P., Ceccanti, B., Cervelli, S. & Conti, C. (1982) Hydrolases extracted from soil: Kinetic parameters of several enzyme catalyzing the same reaction. Soil Biology and Biochemistry 14, 429432.
  • Person, H. A. (1983) The distribution and productivity of fine roots in boreal forests. Plant and soil 71, 87101.
  • Read, D. J. (1984) The structre and function of the vegetative mycelium of mycorrhizal roots. In: The Ecology and Physiology of The Fungal mycelium (Ed. by D. H.Jennings & A. D. M.Rayner), PP 215240. Cambridge University press.
  • Read, D. J. & Bajwa, R. (1985) Some nutritional aspects of the biology of ericaceous mycorrhizas. Proceedings of the Royal Society of Edinburgh 85 B, 317332.
  • Spinner, S. & Hasel wandter, K. (1985) Protiens as nitrogen sources for Hymenoscyphus (= Pezizella) ericae. In: Proceedings of the 6th North American conference on Mycorrhizae (Ed. by R.Molina),P. 422. Forest Research Laboratory, Oregon state Universtity, Corvallis, Oregon .
  • Takahashi, K. & Chang, W. J. (1973) Specifie chemical modifications of acid proteases in the presence and absence of pepstain. Jouranl of Biochemistry 73, 675677.
  • Twining, S. S. (1984) Fluorescein isothiocyanate-labelled casein assay for proteolytic enzymes. Analytical Biochemistry 143, 3034.
  • Urbanek, H. & Yirdaw, G. (1978) Acid proteses produced by Fusarium species in cultures and in infected seedlings. Physiological plant pathology 13, 8187.
  • Wang, H. L. & Hesseltine, C. W. (1965) Studies on the extracellular proteolytic enzymes of Rhizopus oligosporus. Canadian journal of Microbiology 11, 727732.