近零磁场对灰飞虱生长发育的影响

Effects of near-zero magnetic field on the growth and development of small brown planthopper, Laodelphax striatellus

【目的】作为矢量场的地磁场(Geomagnetic field,GMF)不仅可为生物提供定向(定位)信息,并可能影响生物的进化。磁场强度的变化对生物生理、代谢和行为等可产生影响,本研究以迁飞性昆虫为模式生物,探究GMF强度变化对其生长发育的影响,进一步明确其对GMF强度变化的磁响应策略。【方法】以水稻迁飞性害虫灰飞虱Laodelphaxstriatellus为研究对象,利用亥姆霍兹线圈模拟近乎抵消GMF强度的近零磁场(Near-zeromagneticfield,NZMF),明确GMF强度缺失这一极端处理(NZMFvs.GMF)对灰飞虱生长发育的生物学效应。【结果】与GMF相比,NZMF显著延长了若虫历期(+8.23%)及雄成虫寿命(+35.60%)(P<0.05),显著缩短了雌成虫寿命(–17.68%)并显著降低了雌(–15.82%)雄(–15.21%)成虫体重(P<0.05),但NZMF对灰飞虱卵的发育历期影响不显著。【结论】相对于GMF对照,NZMF显著影响灰飞虱若虫和成虫的生长发育,且对灰飞虱成虫寿命的磁生物学效应表现出雌雄二型现象。

[Objectives]As a vector field,the geomagnetic field(GMF)can not only provide orientation(location)information for the creatures on Earth but also potentially affect their evolution.Studies showed that magnetic field intensity changes could result in bio-effects on organisms’physiology,metabolism,behavior,etc.It would help clarify these magnetic effects with insects as model organisms by exploring how the changes in GMF intensity affect their physiological development.[Methods]In order to explore the magnetic response strategies of migratory insects to changes in the GMF intensity,we chose small brown planthopper,Laodelphax striatellus,which is a migratory pest on rice,as the study object and simulated the GMF intensity absence by creating the near-zero magnetic field with Helmholtz coils system,to clarify the bio-effects triggered by the extreme treatment of GMF intensity absence(NZMF versus GMF)on the growth,development and reproduction of L.striatellus.[Results]Compared to the GMF control,NZMF significantly prolonged the nymphal duration(+8.23%)as well as longevity of male adults(+35.60%),while significantly shortened the longevity(–17.68%)of female adults and decreased the body weight of female(–15.82%)and male(–15.21%)adults.No significant effect on the egg duration of L.striatellus was found in this study.[Conclusion]The NZMF(versus GMF)significantly affected the growth and development of L.striatellus,and induced a sexually dimorphic bio-effect on longevity of adult L.striatellus.