人工接種条件下におけるチャ赤焼病の病斑拡大と葉中の全窒素含有量及び葉の成熟度の関係

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  • Relationship Between Lesion Development and Nitrogen Content and Maturity of Tea Leaves after Artificial Inoculation with the Causal Agent of Tea Bacterial Shoot Blight, Pseudomonas syringae pv. theae
  • ジンコウ セッシュ ジョウケン カ ニ オケル チャ セキショウビョウ ノ ビョウハン カクダイ ト ヨウチュウ ノ ゼン チッソ ガンユウリョウ オヨビ ハ ノ セイジュクド ノ カンケイ

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Tea bacterial shoot blight caused by Pseudomonas syringae pv. theae (Pst) is one of the major diseases in tea cultivation in Japan. The bacterial shoot blight resistance of Japanese tea cultivars has not yet been clarified with the exception of that of 'Shizu Inzatsu 131', which has been shown to be extremely susceptible. Because epidemics of bacterial shoot blight occur irregularly, it is difficult to determine disease resistance from field observations. To developing a reliable inoculation assay, we investigated the effects of inoculation date, leaf position, and total nitrogen content of tea leaves on the development of bacterial shoot blight lesions. From 10 May to 28 June 2010, shoots of 'Shizu Inzatsu 131' (susceptible) and 'Yabukita' (moderately resistant) were collected and injected with Pst by using a syringe. The lesions on 'Shizu Inzatsu 131' were larger than those on 'Yabukita' after each inoculation. Lesions on the upper leaves were larger than those on the lower leaves after each inoculation, in each cultivar. Nitrogen content decreased from the upper leaves to the lower ones. There was a significant positive correlation between nitrogen content of tea leaves and lesion size in each cultivar at the 1% level. Total nitrogen content and maturity of tea leaves are among the environmental factors determining susceptibility to bacterial shoot blight.

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