ダイズ加害におけるダイズシストセンチュウと根粒菌の関係

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タイトル別名
  • The Relationship of Interaction between <i>Heterodera glycines</i> ICHINOHE and Rhizobum japonicum to the Growth of Soybeans
  • ダイズ カガイ ニ オケル ダイズシストセンチュウ ト コンリュウキン ノ カンケイ

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Soil (pearlite and sand) in pots having soybean plants was inoculated with soybean cyst nematodes or leguminous bacteria, either at the sowing time or two or four weeks after sowing, or, with both nematodes and bacteria at different combinations. The plants were grown with a deficiency of nitrogen. Heavy infection of nematodes with inoculation of bacteria, particularly a simultaneous infection of nematodes and bacteria, caused the delay and decrease in nodule formation on roots. It is considered that nematodes have produced unfavorable conditions in roots for bacterial infection and the resultant nodule formation. Discoloration of plant leaves appeared to be related closer to the bacterial nodule formation than to nematode infection. The best growth of plant as well as the slightest damage from nematodes occurred when inoculation of bacteria was made at the sowing time comparing with the later inoculations. As the time of bacterial inoculation was delayed, the damage from nematodes tended to become severer. The damage to soybean plant is caused, to a larger part, by the decrease in the nodule formation which is also caused by the nematodes, rather than by the direct injury of nematodes to roots.

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