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By N.C. Brady (Eds.)

ISBN-10: 0120007363

ISBN-13: 9780120007363

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Common rhizosphere microorganisms are able to increase losses of microbial substrates from living roots, and the local production of CIPC by these microorganisms could result from these effects (Bowen, 1980a). These compounds, by relaxing root cell walls, would increase the rates of root exudation, and this could stimulate mycorrhizal fungi in the rhizosphere and facilitate root penetration. The increased leakage of substrates from pine roots caused by species of Bacillus, has been suggested as a cause of the enhancing effect that these bacteria exert on ECM formation (Bowen and Theodorou, 1979).

Vesiculararbuscular mycorrhizal fungi have very little host specificity and any of them can infect virtually any potential host plant (Mosse, 1978; Hayman, 1982);however, they differ in their effectiveness which appears to be more dependent on the specific soil-plant system they colonize than on the host plant itself. A factor determining its effectiveness in enhancing plant growth is the ability of the fungus to develop a great amount of external mycelium, a characteristic inherent with the fungal endophyte (Mosse, 1972) that is affected by the plant-soil system in question.

The processes of infection and nodulation of legumes by their specific species of Rhizobium, and the biochemistry, physiology, and genetics of the N fixation, have been well documented and are clearly beyond the scope of this article (Dazzo and Hubbell, 1975; Nutman, 1977; Bergersen, 1978; Broughton, 1978; Casadesds and Olivares, 1978; DCnari6 and Truchet, 1979; Gibson and Newton, 1981; Bauer, 1981). Nevertheless, it is noteworthy that the infection mechanism of a legume root by its appropriate species of Rhizobium, particularly the process of N fixation, has a high energy requirement.

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Advances in Agronomy by N.C. Brady (Eds.)

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