Mycorrhiza: Structure, Function, Molecular Biology and by S. E. Smith (auth.), Professor Dr. Ajit Varma, Professor Dr.

By S. E. Smith (auth.), Professor Dr. Ajit Varma, Professor Dr. Bertold Hock (eds.)

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Extra resources for Mycorrhiza: Structure, Function, Molecular Biology and Biotechnology

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Luteus, and S. variegatus) was induced by exposing the spores to exudates from roots of Pinus sylvestris (Fries 1987). The first germination-inducing compound identified in root exudates was the diterpene resin acid, abietic acid (Fries et al. 1987). While the mechanistic details for the induction of germination are not understood, interaction of the germinating hyphre with a growing root presumably confers an important selective advantage to Suillus mycelium. It is not known how widely these germination factors may occur in other mycorrhizal associations, but many ectomycorrhizal species exhibit a loose specificity since they respond to several types of germination activators from bacteria or other microorganisms.

These data demonstrated that protein extraction and separation have been properly carried out in our studies of eucalypt mycorrhizas and that ectomycorrhizins are not artifactual products resulting from protein degradation. Observation of ectomycorrhizins in other mycorrhizal systems supports this contention. 4 Symbiosis-Related Proteins in Other Mycorrhizas SR proteins were initially identified in the symbiotic association formed by P. tinctorius and either E. globulus or E. grandis (Hilbert and Martin 1988; Hilbert et al.

1985; Hurkman and Tanaka 1986; Holloway and Arundel 1988). For the studies of eucalypt ectomycorrhiza, the procedure for protein extraction and 2-D PAGE separation of polypeptides described by Zivy (1986) was used. According to this procedure, samples were powdered in liquid N2 and homogenized using cold acetone (-20°C) containing trichloroacetic acid (TCA) and 2-mercaptoethanol. Proteins were then precipitated at -20°C, centrifuged and washed pellets were resuspended in O'Farrell (1975) lysis buffer to solubilize the proteins.

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