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By Marjorie A. Hoy

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Basic research supports this statement as summarized by Baker (1968). For production of antibiotics, microorganisms require substantial amounts of substrate, particularly carbon. Once produced, most antibiotics have electrical charges on their molecules. Colloids with opposite charges abound in soil and inactivate these inhibitors. There is even evidence that antibiotics can be utilized as a sole carbon source by some of the more voracious saprophytes! As mentioned by Pramer in his statement, the work of Wright (1956) demonstrated that the antibiotic, gliotoxin, produced by Trichoderma viride could only be detected in colonized seed coats or in bits of organic matter.

Pseudobactin is involved in competition for iron, is a siderophore (treated later), and has been mislabeled as an antibiotic (Neilands 1973)· Again, biological control realized by the activity of these fluorescent pseudomonads operates in the rhizosphere, and this Biological Control of Plant Pathogens 31 emphasizes the principle that inhibitory compounds operate in localized areas (Scher & Baker 1982). " In some systems, antibiosis could play a role in protection of a well-defined and treatable infection court.

2:7-8. P. 1959. Occurrence and transfer of a biological factor In soil that suppresses potato scab. Phytopathology 49:648-652. B. 1973. Mlcroblal Ion transport compounds (siderophores), pp. 167202. L. ), Inorganic biochemistry. Elsevler, Amsterdam. B. ). 1974. Mlcroblal Iron metabolism. Y. 597 pp. C. 1908. On a method of checking parasitic diseases In plants. J. Agr. Scl. 3:102-107. Rlshbeth, J. 1963. Stump protection against Fomes annosus. III. Inoculation with Penlophora glgantla. Ann. Appl. Blol.

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