イネ紋枯病の上位進展経過と葉鞘内窒素・澱粉の量的変化

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Thirteen cultivars of rice plant, Oryza sativa L., with different heading time were tested for their resistance to vertical spread of sheath blight caused by Rhizoctonia solani Kuhn under varied environmental and physiological regimes and the results were correlated with nitrogen and starch contents in sheaths. Vertical disease development was always more extensive in early maturing cultivars than in late maturing ones. Delayed sowing resulted in a decreased vertical spread. On the other hand, whenthese varieties were sown and planted to head at the same time, difference in the degree of vertical spread between the early and late cultivars became small. These results suggested that the vertical spread of sheath blight was correlated with physiological condition of the sheaths rather than the environmental conditions and led us to analyze starch and nitrogen contents in sheaths as factors reflecting physiological conditions associated with vertical spread. Starch contents in sheaths of the early cultivars were 5.O-21.2 mg/g fresh weight and mycelial growth on nitrogen-containing media added with starch at this range of concentrations was as good as that observed in these sheaths. On the contrary, starch contents in late cultivars were 24.7-32.2 mg/g fresh weight, and the fungal growth on media containing this level of starch was reduced even if increasing concentration of nitrogen was added to the media, suggesting that sheaths of the late cultivars might be nutritionally less favorable for the fungal growth than those of the early cultivars. Starch content in the sheaths of early cultivars rapidly decreased with time in contrast to the slow decrease in those of late cultivars. These results suggest that the vertical spread of sheath blight is correlated with the quantitative changes of nitrogen and starch in the sheaths.
日本植物病理学会の論文
1977-01-25

イネ紋枯病の上位進展経過と葉鞘内窒素・澱粉の量的変化

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