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于2010年在田间条件下研究了水稻品种和氮肥施用水平(250kg/hm2有效氮,125kg/hm2有效氮及不施氮肥的处理)对褐飞虱Nilaparvata lugens(Stl)发生的影响。结果表明,8月10日—9月10日期间,南粳44、宁粳1号、丙123、淮稻9号4个水稻品种上褐飞虱虫量显著低于感虫对照TN1上虫量;9月20日—9月30日,南粳44上的褐飞虱虫量显著高于宁粳1号、丙123、淮稻9号上的虫量。8月20—10月10日期间,氮肥施用水平高的水稻上褐飞虱虫量最高,低氮处理水稻上的虫量次之,不施氮肥水稻上的虫量最少。水稻品种与氮肥施用水平的交互作用对褐飞虱发生的影响不明显。南粳44等4个粳稻品种植株内抗虫物质草酸、类黄酮的含量未显著高于感虫对照TN1,取食不同水稻品种的褐飞虱虫体游离氨基酸含量无显著差异,表明不同水稻品种间虫量不同与草酸、类黄酮的含量以及褐飞虱虫体游离氨基酸的含量不相关。高氮处理水稻植株上草酸、类黄酮含量最低,低氮处理的次之,不施氮肥的对照最高;在高氮处理植株上褐飞虱虫体中甘氨酸、缬氨酸、异亮氨酸、亮氨酸、赖氨酸5种游离氨基酸含量显著高于在未施氮肥植株上的褐飞虱。由此推测高氮植株中草酸、类黄酮含量低以及取食高氮植株褐飞虱虫体中甘氨酸等5种游离氨基酸的含量显著提高是导致高氮植株上褐飞虱虫量偏高的重要原因。
In 2010, the effects of rice varieties and N application rates (available nitrogen of 250kg / hm2, available nitrogen of 125kg / hm2 and no nitrogen application) on the occurrence of Nilaparvata lugens (Stl) were studied under field conditions. The results showed that from August 10 to September 10, the population of N. lugens on four rice cultivars, Nanjing 4, Ningjing 1, C 123 and Huai 9, was significantly lower than that on the susceptible control TN1 9 From January 20 to September 30, the population of BPH on Nanjing 44 was significantly higher than that of Ningjing 1, C 123 and Huai 9. During the period from August 20 to October 10, the population of Nilaparvata lugens (Nilaparvata Lupuridus) was the highest in the high nitrogenous fertilizer application, followed by the low nitrogen treatment rice, and the least in the non-nitrogenous rice. The interaction between rice varieties and N application level had no obvious effect on the occurrence of BPH. The content of oxalic acid and flavonoids in four japonica rice cultivars such as Nanjing 44 was not significantly higher than that of the susceptible control TN1. There was no significant difference in free amino acid content among the brown planthopper species fed on different rice varieties, indicating that different rice varieties The amount of oxalic acid, flavonoids and brown planthopper parasites free amino acid content is not related. The contents of oxalic acid and flavonoids in the high-nitrogen-treated rice plants were the lowest, followed by the low-nitrogen treatments, and highest in the non-nitrogen-fertilized plants. The contents of glycine, valine, isoleucine, The contents of free amino acids in acid and lysine were significantly higher than those in non-nitrogenous plants. Therefore, it is speculated that the high content of oxalic acid and flavonoids in high-nitrogen plants and the increase of five kinds of free amino acids, such as glycine, in N. lugens fed on high-nitrogen plants were significantly increased, which were the main reasons leading to the high population of N. lugens on high-nitrogen plants.