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研究了3个施氮水平(N_0,N_(90),N_(180))对9个水稻品种抗白叶枯病反应的影响。晚稻苗期接种强致病菌株76-25 SR-l后15d,N_(180)处理病斑长度显著(P=0.01)高于N_(90)和N_0处理,但晚稻成株期剑叶接种该菌株后20d,仅中间反应型品种处理间存在显著差异。在早稻成株期用该菌株处理得到类似的结果,而用弱致病力菌株83-5接种时均无显著差异。各试验中品种抗病强弱次序不受施氮水平影响。TLC结果表明施氮后游离氨基酸尤其是Clu和Asp含量显著上升,而还原糖尤其是蔗糖含量显着下降。因此,可得出结论;氮素可在某种程度上尤其是在苗期影响水稻对强致病力菌株的抗性表现。高游离氨基酸和低还原糖似与病斑增长有关。
The effects of three nitrogen levels (N_0, N_ (90), N_ (180)) on the resistance to bacterial blight in nine rice cultivars were studied. In the late rice stage, 15 (superscript th) days after inoculation with virulent strain 76-25 SR-1, the N 180 lesion length was significantly (P 0.01) higher than N 90 and N 0 treatments, At 20 days after the strain, there were significant differences among the treatments of only middle-response cultivars. Similar treatment was obtained with this strain at early adult rice stage, but no significant difference was observed when using virulent strain 83-5. The order of disease resistance in each experiment was not affected by the level of nitrogen fertilizer. The results of TLC showed that the contents of free amino acids, especially Clu and Asp, increased significantly after nitrogen application, while the content of reducing sugar, especially sucrose, decreased significantly. Therefore, it can be concluded that nitrogen can affect rice resistance to virulent strains to some extent, especially in seedling stage. High free amino acids and low reducing sugars similar to the lesion growth.