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地磁定向是昆虫远距离迁飞定向的重要机制之一。本研究以褐飞虱Nilaparvata lugens长翅型和短翅型成虫为研究对象,利用MPMS-7型号超导量子干涉磁强计(磁场范围为±4.8mA/m,温度范围为1.9～400K)检测虫体内的磁性物质,明确其体内的分布状况。结果表明:褐飞虱长翅型雄成虫整个虫体的温度退磁曲线在T=220K处无明显拐点,磁滞回线无明显闭合现象;长翅型雌成虫及短翅型雌、雄成虫整体磁性物质检测结果与长翅型雄成虫类似,说明利用成虫整体进行磁性物质检测效果不明显。分体段检测时,褐飞虱短翅型和长翅型雌、雄成虫腹部温度退磁曲线在T=220K处有明显拐点,且磁滞回线明显闭合,说明该部位有磁滞(即矫顽力)存在,也即存在着磁性物质;而短翅型和长翅型雌、雄成虫头胸部的磁滞回线无闭合现象,说明该部位无磁性物质存在。褐飞虱虫体内磁性物质的存在为其远距离迁飞过程中实现地磁定向提供了物质基础。
The geomagnetic orientation is one of the important mechanisms for the insect to move away from the target. In this study, the long-winged and short-winged adults of Nilaparvata lugens were selected as the research object. The MPMS-7 model superconducting quantum interference magnetometer (magnetic field range of ± 4.8mA / m, temperature range of 1.9 ~ 400K) Of the magnetic material, clear the distribution of the body. The results showed that the temperature demagnetization curve of the entire larvae of N. lugens showed no inflection point at T = 220K and no obvious hysteresis loops were observed. The long-winged female and the short-winged female and male adult The test results are similar to the long-winged male, indicating that the use of adult whole body magnetic material test results are not obvious. During the detection of split body, the temperature demagnetization curve of abdomen of short-winged and winged female of N. lugens had a significant inflection point at T = 220K and the hysteresis loop was obviously closed, indicating that there was hysteresis (ie, coercivity ), That is, the presence of magnetic material; while the short-winged and long-winged female and male adult head and chest hysteresis loop closed phenomenon, indicating that there is no magnetic material exists. The presence of magnetic material in the brown planthopper provides a material basis for achieving geomagnetic orientation during long-distance flight.