Bio-effects of near-zero magnetic fields on the growth, development and reproduction of small brown planthopper, Laodelphax striatellus and brown planthopper, Nilaparvata lugens

• Published in: Journal of insect physiology 2014-09, Vol.68, p.7-15
• Main Authors: Wan, Gui-jun, Jiang, Shou-lin, Zhao, Zong-chao, Xu, Jing-jing, Tao, Xiao-rong, Sword, Gregory A., Gao, Yue-bo, Pan, Wei-dong, Chen, Fa-jun
• Format: Article
• Language: English
• Subjects: Animals; Bio-effects; Fecundity; Female; Fertility; Growth and development; Hemiptera - growth & development; Hemiptera - physiology; Laodelphax striatellus; Magnetic Fields - adverse effects; Male; Migratory insects; Near-zero magnetic fields; Nilaparvata lugens; Nymph - growth & development; Reproduction - physiology; Rice planthoppers; Sex Factors
• ISSN: 0022-1910; 1879-1611
• DOI: 10.1016/j.jinsphys.2014.06.016

[Display omitted] •NZMF prolonged egg and nymph duration, and decreased adult weight for SBPH and BPH.•NZMF reduced Vg level with a decrease in egg production for SBPH and BPH females.•NZMF has negative effects on the development and reproduction of SBPH and BPH. Magnetic fields markedly affect the growth and development of many species of organisms potentially due to cryptochrome and endogenous presence of magnetic materials. Sensitivity to magnetic fields can also be involved in geomagnetic orientation by some long-distance migratory insects. In this study, near-zero magnetic fields (NZMF) in relation to normal geomagnetic fields (GMF) were setup using the Hypomagnetic Field Space System (HMFs) to investigate the effects of magnetic fields on the growth, development and reproduction of two species of migratory planthopper, the small brown planthopper (abbr. SBPH), Laodelphax striatellus, and the brown planthopper (abbr. BPH), Nilaparvata lugens. Exposure of both L. striatellus and N. lugens to NZMF delayed egg and nymphal developmental durations and decreased adult weight and female fecundity. The 1st–5th instars of SBPH and BPH showed different responses to NZMF. The 4th instar was significantly affected by NZMF, especially for BPH males, in which NZMF exposure reduced the difference in development duration between females and males. Compared with GMF, the vitellogenin transcript levels of newly molted female adults and the number of eggs per female were significantly reduced in both planthopper species, indicating a negative effect on fertility under NZMF. Our findings provided experimental evidence that NZMF negatively affected the growth and development of SBPH and BPH, with particularly strong effects on reproduction.