Han Yongqiang, Lei Wenbin, Wen Lizhang, Hou Maolin
College of Plant Protection, Hunan Agricultural University, Changsha, Hunan Province, China; State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Haidian, Beijing, China.
State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Haidian, Beijing, China.
PLoS One. 2015 Apr 2;10(3):e0120557. doi: 10.1371/journal.pone.0120557. eCollection 2015.
The rice leaf folder, Cnaphalocrocis medinalis (Guenée), is one of the most destructive rice pests in Asian countries. Rice varieties resistant to the rice leaf folder are generally characterized by high silicon content. In this study, silicon amendment, at 0.16 and 0.32 g Si/kg soil, enhanced resistance of a susceptible rice variety to the rice leaf folder. Silicon addition to rice plants at both the low and high rates significantly extended larval development and reduced larval survival rate and pupation rate in the rice leaf folder. When applied at the high rate, silicon amendment reduced third-instars' weight gain and pupal weight. Altogether, intrinsic rate of increase, finite rate of increase and net reproduction rate of the rice leaf folder population were all reduced at both the low and high silicon addition rates. Although the third instars consumed more in silicon-amended treatments, C:N ratio in rice leaves was significantly increased and food conversion efficiencies were reduced due to increased silicon concentration in rice leaves. Our results indicate that reduced food quality and food conversion efficiencies resulted from silicon addition account for the enhanced resistance in the susceptible rice variety to the rice leaf folder.
稻纵卷叶螟（Cnaphalocrocis medinalis (Guenée)）是亚洲国家最具破坏性的水稻害虫之一。抗稻纵卷叶螟的水稻品种通常具有高硅含量的特征。在本研究中，以0.16和0.32克硅/千克土壤的量添加硅，增强了一个感病水稻品种对稻纵卷叶螟的抗性。低剂量和高剂量向水稻植株添加硅均显著延长了稻纵卷叶螟幼虫的发育时间，并降低了其幼虫存活率和化蛹率。高剂量添加硅时，可降低三龄幼虫的体重增加和蛹重。总体而言，低剂量和高剂量添加硅时，稻纵卷叶螟种群的内禀增长率、周限增长率和净增殖率均降低。虽然在添加硅的处理中三龄幼虫的食量增加，但由于水稻叶片硅浓度增加，水稻叶片的碳氮比显著升高，食物转化效率降低。我们的结果表明，添加硅导致的食物质量下降和食物转化效率降低是感病水稻品种对稻纵卷叶螟抗性增强的原因。
