青枯病菌の各種作物根圏における動態と感染との関係
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概要
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To effectively select succeeding crops or rotation crops for controlling bacterial wilt caused by <I>Pseudomonas solanacearum</I>, the behavior of <I>P.solanacearum</I> in the rhizospheres was investigated.<BR>1) The concentration of the causal bacterium increased in the rhizospheres when solanaceous plants were infected. However, the concentration of the causal bacterium did not increase after cultivating sweetcorn, sorghum, wheat, soybean, cabbage, squash or watermelon. It is of particular interest that cultivation of soybean reduced the concentration of the causal bacterium to the point where it could not be detected.<BR>2) Spinach was infected with <I>P. solanacearum</I>. The percentages of infection to spinach increased when the air temperature was high. Differences in the susceptibility of spinach to the strains of the causal bacterium could not be clearly determined but it was infected by all of them.<BR>The effective selection of rotation crops to prevent bacterial wilt may be possible as a result of this study on the behavior of pathogenic bacterium in the rhizosphere.
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