Studies on the <i>Chloroscypha</i> needle blight of “Sugi” (<i>Cruptomeria japonica</i> D. DON) (I)

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Other Title
  • スギ黒粒葉枯病に関する研究 (I)
  • スギ黒粒葉枯病に関する研究-1-子のう胞子の放出および発芽条件
  • スギ クロツブハガレビョウ ニカンスルケンキュウ 1 シノウ ホウシ ノ ホウ
  • 予のう胞子の放出および発芽条件
  • Conditions on discharge and germination of ascospores

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Discharge of ascospores from mature apothecia of Chloroscypha seaveri and their rate of germination were examined under various conditions. Ascospore discharge occurred at 0 to 30°C under an experimental condition of 100% relative humidity. At temperatures above 10°C most ascospores in the apothecia were discharged within 10 days after commencement of spore discharge, but at 0 and 5°C few ascospores were discharged during observation periods. All ascospores in the apothecia were discharged within 3 to 4 days at 100% relative humidity. At 98% relative humidity there were few discharged ascospores, and at the relative humidity below 94%, discharge did not occur. Ascospores germinated at temperatures ranging from 10 to 25°C. The highest rate of germination occurred at temperatures of 15 to 20°C. Ascospores from apothecia collected from February to June germinated at a high rate. None of the ascospores from apothecia collected from October to December germinated. After keeping mature apothecia collected in late autumn for 3 months at 5°C, however, ascospores from those apothecia began to germinate at a high rate. The relative humidity of 100% was favorable for germination of ascospores and there were few germinating ascospores at relative humidity below 98%. When ascospores were kept in water adjusted to various H-ion concentrations, pH 3.3 to 10, the rate of ascospore germination was high, and there were no differences in the germination rate at each pH. The rate of germination decreased remarkably at pH 2.1.

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