水田におけるクワイ品種のひぶくれ病の発生と罹病植物における胞子球の形成

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タイトル別名
  • Occurrence of Leaf Smut Caused by Doassansia horiana P. Hennings onChinese Arrowhead Cultivars in a Paddy Field andFormation of Spore Balls in Infected Leaves.
  • 水田におけるクワイ品種のひぶくれ病の発生とり病植物における胞子球の形成
  • スイデン ニ オケル クワイ ヒンシュ ノ ヒブク レビョウ ノ ハッセイ ト

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抄録

Leaf smut caused by Doassansia horiana P. Hennings occurs widely in paddy fields of cultivated Chinese arrowhead (Sagittaria trifolia L. var. edulis Sieb.). The cultivars ‘Aokuwai’, ‘Shirokuwai’ and ‘Suitakuwai’ of Chinese arrowhead, wild arrowhead (S. trifolia L.) and the wild species S. aginashi Makino were cultivated in a paddy field in Kadoma City, Osaka Prefecture in 1994 and 1995. Leaf smut spots formed on leaf blades of the three cultivars and wild arrowhead in July and August. The spots did not form on leaves of S. aginashi. Most spots formed from late July to early August, when the average temperature was more than 27°C. More spots formed on the three cultivars than on wild arrowhead. Blister smut was also observed on petioles of the cultivars during this period. No spots or blisters were observed on the corms of either the cultivars or wild arrowhead. Scanning electron microscopy showed spore balls in the immature spots on the leaf blade. Spore-like bodies were observed in immature spore balls. Many spore balls were found in mature spots on leaf blades and mature blisters on petioles. Spore balls in mature spots were larger than those in the immature spots. The surface of the spore balls was covered with mycelia. The immature spore balls in the wild arrowhead morphologically resembled those in Chinese arrowhead.

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