レモンから分離したカンキツかいよう病菌の炭水化物利用能による系統識別および圃場内空間分布

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  • Differentiation of strains by the utilization of some carbohydrates and spatial distribution of citrus bacterial canker collected from a grove of lemon trees.
  • レモン カラ ブンリ シタ カンキツカイヨウビョウキン ノ タンスイカブツ リヨウノウ ニ ヨル ケイトウ シキベツ オヨビ ホジョウ ナイ クウカン ブンプ

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<p>Spatial pattern of citrus canker was examined in a lemon grove. Twenty-nine isolates of Xanthomonas citri subsp. citri were collected from the symptomatic leaves of lemon trees. All the citrus canker isolates caused corky lesion of citrus canker by pin-prick inoculation on navel orange leaves, confirming their pathogenicity. There was a correlation between the ability of mannitol utilization and the lesion area on navel orange. The physiological properties of bacteria demonstrated that all the isolates were classified into seven strains based on the utilization of carbohydrates （mannitol, mannose, maltose, lactose and malonate）. Strain 1 was the most prevalent type of strain among all the isolates and utilized all five kinds of carbohydrates, generating an aggregated distribution in a lemon grove. These results suggest that in the life cycle of citrus canker, young stem lesions of strain 1 from angular shoots would be potentially the dominant source for secondary infection.</p>

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