チャ葉でのチャ輪斑病の発生に及ぼすチャ赤菓枯病菌の影響

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Influence of the tea brown blight fungus, Glomerella cingulata, on the formation of lesions on leaves of the tea plant by the tea gray blight fungus, Pestalotia longiseta, was studied. In the tea garden planted to cv. Yabukita which is very susceptible to P. longiseta but resistant to G. cingulata, the formation of the lesions on leaves by P. longiseta was markedly suppressed when G. cingulata was included in the inoculation test. Pre- and post-inoculation with G. cingulata was similarly effective in the suppression of the formation of the lesions by P. longiseta in the field test. The observation of detached new shoots in the test suggested the existence of two suppression mechanisms. The first consisted of the change of the infective fungus from P. longiseta to G. cingulata on the border of the lesions formed by P. longiseta. It was considered that G. cingulata replaced P. longiseta and since the tea leaf tissues were resistant to G. cingulata, the expansion of the lesions was inhibited. Lesions thus formed showed a translucent or dark-purple margin (protection band), wholly or partly. In such lesions, G. cingulata was detected inside of the margin, and P.longiseta in the other parts of the lesions. Variations in the lesion size and the distribution ratio of the two fungi in the lesions was ascribed to the timing and extent of the change of dominance from P. longiseta to G. cingulata. The second suppression mechanism consisted of the induction of resistance by pre-inoculation with G. cingulata, which prevented the infection by P. longiseta.
日本植物病理学会の論文
1989-07-25

チャ葉でのチャ輪斑病の発生に及ぼすチャ赤菓枯病菌の影響

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