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KMID : 0545120010110010160
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Journal of Microbiology and Biotechnology
2001 Volume.11 No. 1 p.160 ~ p.163
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Comparison of the Chemotaxis Potential of Bacteria Isolated from Spinach Roots and Nonrhixosphere Soil
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KIM, JONG-SHIK
SAKAI, MASAO/LEE, SI-KYUNG/YAHANG, CHAHNG-SOOL/MATSUGUCHI, TATSUHIKI
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Abstract
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In order to investigate the role of bacterial chemotaxis in root colonization, the chemotaxis potential of bacteria isolated from spinach roots was compared with that of bacteria from nonrhizosphere soil, with reference to the plant age (1,000isolates), soil moisture conditions (1,400isolates), and part of the root (200isolates). The % CT (% occurrence of chemotaxis (+) isolates among total bacterial isolates) of the root isolates significantly fluctuated during the plant growth period, reaching a maximum after 10-15 days of growth. At this time period, the maximum % CT for the root isolates was around 70-80% CT under a soil moisture of 50% WFP (% volume of waterfilled pores in total soil pores), and then gradually reduced with an increasing % WFP. The results of the chemotaxis potential of each of the 100 isolates from the spinach roots and nonrhizosphere soil under various % WFP demonstrated that the % CT of the root isolates were significantly higher than those of isolates from the nonrhizosphere soil under a wide range of soil moisture content (35-80% WFP). Furthermore, the % CT value (80%) from the upper root was significantly higher than that (55%) from the lower root. Compared with the % CT values of the roots, the values from the nonrhizosphere soil did not significantly vary relative to the plant age or % WFR These results indicate that chemotaxis would appear to be a major factor in bacterial root colonization.
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KEYWORD
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