Biology of the Rhizobiaceae. International Review of by Kenneth L. Giles and Alan G. Atherly (Eds.)

By Kenneth L. Giles and Alan G. Atherly (Eds.)

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Growth in Soil, Tumors, and Rhizosphere Precise measurements have not been made of the growth rates of agrobacteria in soil, the rhizosphere, or galls. Agrobacteria generally can be recovered from these three habitats and in some cases show an increase in population over an earlier assay. Agrobacteria also colonize the roots of nonhost plants such as corn (Starkey, 1931) and weeds (L. W. Moore, unpublished). However, there is no evidence that they multiply in fallow, natural soil. In fumigated soil held in the laboratory there was an initial increase in the population after inoculation, followed by a decline to nondetectable levels (Patel, 1928a; Dickey, 1961; Munnecke and Ferguson, 1960).

Tumefaciens inoculated into wounded tomato stems increased in number the first 3 days and then remained constant over the next 7 or 8 days. Thus A. tumefaciens in the rhizosphere or in a wound attain a constant population density because of limited nutrients. However, nutrient availability could increase over time as the tumor enlarges. There is a need for research in the area of population dynamics of Agrobacterium in the soil, the rhizosphere, and the tumor, with emphasis on generation times.

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