Xu Chunxiao, Li Yue, Yu Yang, Zhang Yuxia, Wei Shufeng
Beijing Key Laboratory of Bioelectromagnetism, Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing, China.
Bioelectromagnetics. 2015 Sep;36(6):476-9. doi: 10.1002/bem.21927. Epub 2015 Jun 11.
We previously reported that a near-null magnetic field suppressed Arabidopsis flowering in white light, which might be related to the function modification of cryptochrome (CRY). To further demonstrate that the effect of near-null magnetic field on Arabidopsis flowering is associated with CRY, Arabidopsis wild type and CRY mutant plants were grown in the near-null magnetic field under blue or red light with different light cycle and photosynthetic photon flux density. We found that Arabidopsis flowering was significantly suppressed by near-null magnetic field in blue light with lower intensity (10 µmol/m(2) /s) and shorter cycle (12 h period: 6 h light/6 h dark). However, flowering time of CRY1/CRY2 mutants did not show any difference between plants grown in near-null magnetic field and in local geomagnetic field under detected light conditions. In red light, no significant difference was shown in Arabidopsis flowering between plants in near-null magnetic field and local geomagnetic field under detected light cycles and intensities. These results suggest that changes of blue light cycle and intensity alter the effect of near-null magnetic field on Arabidopsis flowering, which is mediated by CRY.
我们之前报道过，近零磁场在白光下抑制拟南芥开花，这可能与隐花色素（CRY）功能改变有关。为进一步证明近零磁场对拟南芥开花的影响与CRY相关，将拟南芥野生型和CRY突变体植株在近零磁场下，于不同光周期和光合光子通量密度的蓝光或红光下培养。我们发现，在强度较低（10 µmol/m²/s）且周期较短（12小时周期：6小时光照/6小时黑暗）的蓝光下，近零磁场显著抑制拟南芥开花。然而，在检测到的光照条件下，CRY1/CRY2突变体植株在近零磁场和当地地磁场中生长时，开花时间没有任何差异。在红光下，在检测到的光周期和强度条件下，近零磁场中的植株与当地地磁场中的植株在拟南芥开花方面没有显著差异。这些结果表明，蓝光周期和强度的变化改变了近零磁场对拟南芥开花的影响，这是由CRY介导的。
