水稻施用硅肥对稻纵卷叶螟幼虫取食和成虫产卵选择性的影响
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植物病虫害生物学国家重点实验室,植物病虫害生物学国家重点实验室,湖南农业大学植物保护学院,植物病虫害生物学国家重点实验室

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国家自然科学基金资助项目(31371951)


Effect of silicon addition to rice plants on Cnaphalocrocis medinalis feeding and oviposition preference
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State Key Laboratory of Plant Diseases and Insect Pests,Institute of Plant Protection,Chinese Academy of Agricultural Sciences,State Key Laboratory of Plant Diseases and Insect Pests,Institute of Plant Protection,Chinese Academy of Agricultural Sciences,College of Plant Protection,Hunan Agricultural University,State Key Laboratory of Plant Diseases and Insect Pests,Institute of Plant Protection,Chinese Academy of Agricultural Sciences

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    摘要:

    采用感虫水稻品种TN1,设置3种施硅水平,即高硅(0.32 g Si/kg土壤)、低硅(0.16 g Si/kg土壤)和不施硅对照(0 g Si/kg土壤),研究了施用硅肥对稻纵卷叶螟产卵和取食选择性的影响。结果表明:稻纵卷叶螟幼虫对硅处理水稻叶片的取食选择性和成虫在硅处理水稻上的着卵量、着卵率均显著低于对照水稻。高硅处理水稻叶片中的硅含量、可溶性糖含量和碳氮比高于对照,而氮含量低于对照;低硅处理水稻叶片的碳氮比高于对照、氮含量低于对照。同时,硅处理显著降低水稻的卷叶株率和卷叶率。这些结果表明,施硅能增强稻纵卷叶螟对水稻的不选择性,从而增强水稻对稻纵卷叶螟的抗性。

    Abstract:

    Rice is a silicon (Si)-accumulating plant species. It is estimated that a rice crop producing 1,000 kg yield will remove 130 kg Si from the soil, twice as much as the combined absorption of nitrogen, phosphorus, and potassium. The rice leaf folder (LF), Cnaphalocrocis medinalis (Guenée), is one of the most destructive rice pests in Asian rice-producing countries. Recently, major outbreaks of LF have been reported in many Asian countries including China, severely threatening rice production. Rice varieties resistant to LF have either a high Si cell density or high Si content in the leaf blade. Currently, LF populations are principally managed with chemical insecticides that have caused high residual, insecticide resistance and a resurgence of pests. Alternatively, cultivar resistance and crop management including Si amendment are being developed. There is increasing evidence showing a positive association between high plant Si content and resistance to insect herbivory in monocots and dicots. Si amendment can influence insect herbivores in several ways, including acting as a physical barrier, deterring feeding behavior, reducing food consumption efficiency and performance, and effecting herbivores at a transcriptional level through differential regulation of plant genes. In the present paper, we report the effects of Si addition to rice plants on feeding and oviposition preference and damage by the LF. We used the susceptible rice cultivar Taichung Native 1 (TN1) and added Si at 0.32 (high rate), 0.16 (low rate), and 0 g Si/kg soil (control). In preference tests, LF larval settlement and egg deposition on rice plants amended with Si at both the low and high rates were significantly reduced. Si amendment at the high rate significantly increased the Si and soluble sugar contents and C/N ratio and decreased the nitrogen content in rice leaves compared with the control; Si addition at the low rate significantly increased the C/N ratio and decreased the nitrogen content in rice leaves in comparison with the control. The damage rates decreased significantly in rice plants amended with Si at the high rate than that of the control. Our results indicate that Si addition to susceptible rice plants could enhance plant resistance to LF through reduced feeding and oviposition preference.

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韩永强,弓少龙,文礼章,侯茂林.水稻施用硅肥对稻纵卷叶螟幼虫取食和成虫产卵选择性的影响.生态学报,2017,37(5):1623~1629

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