Abstract
Abstract Effect of soil salinity associated with intensive cultivation including horticulture on microbial communities in the soil-root system was investigated in a growth chamber experiment. Spinach plants were grown on three soil samples of the same origin but with low, medium, and high levels of salinity. Microbial populations, including fluorescent pseudomonads, in three sites of the soil-root system, namely root-free soil, rhizosphere soil, and rhizoplane, of 3-week-old spinach plants were compared in relation to the levels of soil salinity. Effect of soil salinity on the microbial populations differed widely among the three sites of the soil-root system, as well as among the microbial groups. In the root-free soil, populations of total bacteria (TB) and gram-negative bacteria (GN) did not change significantly through salinity, while the populations of total fluorescent pseudomonads (FP) apparently increased. In the rhizosphere soil, however, soil salinity induced changes in the populations depending...
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