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Sensitivity to tricyclazole of 129 single-conidial isolates of rice blast fungus, Magnaporthe grisea, was determined. EC50 values ranged from 0.06 to 1.12 mg/L with an average value of 0.46 ± 0.09 mg/L according to the detached leaf segment tests. No significant difference of sensitivity was observed between isolates from Guangdong and Jiangsu where decreased efficacy was reported, and from two other provinces where tricyclazole provided excellent disease control. In seedling tests, tricyclazole could control the most tolerant isolate GY-6 successfully with a efficacy of 81.5% at the concentration of 40 mg/L. Sensitivities of GY-6 and DY-2, the most sensitive isolate, to tricyclazole were both unstable in sub-cultured single-conidial offspring isolates, with respective mean EC50 values of 5.40 ± 0.97 and 4.50 ± 0.88 mg/L calculated from seedling tests. There was no amino acid difference between them in the coding sequences of 1,3,6,8-tetrahydroxynaphthalene reductase and 1,3,8-trihydroxynaphthalene reductase. These results suggested that the decreased control reported in Guangdong and Jiangsu could not be attributed to the occurrence of resistance. When continuously “inoculated-reisolated-reinoculated” under the selection of tricyclazole in vivo, sensitivity of DY-2 decreased 10-fold after 20 generations, although the sensitivity of GY-6 did not shift significantly. 相似文献
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小麦新品系“农鉴1号”具有耐肥性强、分蘖力强、籽粒蛋白质含量高、早熟等优良特性。这些特性均与该品系体内硝酸还原酶活力(NRA_s)变化规律密切相关。苗期低的NRA_s,使该品系具有较强的耐肥性;分蘖期较高的NRA_s,可促进和增加分蘖;孕穗至开花期低的NRA_s,有利于花和幼果的生长,使籽粒饱满;灌浆盛期高的NRA_s,决定了该品系蛋白质含量高的特性;灌浆高峰期后,NRA_s的急剧衰减,促进了该品系的早熟。 相似文献
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大豆硝酸还原酶活力与硝态氮含量的关系 总被引：5，自引：1，他引：5
大豆植株主茎硝酸盐含量从基部向上逐渐增加,营养生长期和开花盛期,近幼生茎下段茎节间硝态氮含量较高,结荚期以后幼生茎段硝态氮含量较高。大豆品种间硝态氮含量和硝酸还原酶活力有明显的差异。吉林20号硝态氮含量和硝酸还原酶活力较高,而大白眉较低。大豆品种间内源基质硝酸还原酶活力差异和外源基质硝酸还原酶活力差异结果是一致的。内源基质硝酸还原酶活力和外源基质硝酸还原酶活力都与幼生茎段硝态氮含量呈显著正相关。 相似文献
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五种阔叶树光合特性研究 总被引：5，自引：0，他引：5
对胡桃楸，水曲柳，黄波罗，紫椴和白桦的光合特性进行研究的结果表明，随着幼叶成长和叶绿素含是的增加，各树种光合能力与硝酸还原酶活力也增加。晴天，白桦与水曲柳光合曲线呈双峰，其余３树种则呈单峰。阴雨数日转晴后，白桦和水曲柳光合曲线呈单峰，其余３树种呈双峰。阴天５个树种光合曲线均与光强曲线相似。 相似文献
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