Division of Agricultural Physics, Indian Agricultural Research Institute, New Delhi 110012, India.
J Plant Physiol. 2010 Jan 15;167(2):149-56. doi: 10.1016/j.jplph.2009.08.011.
Seeds of sunflower (Helianthus annuus) were exposed in batches to static magnetic fields of strength from 0 to 250mT in steps of 50mT for 1-4h in steps of 1h. Treatment of sunflower seeds in these magnetic fields increased the speed of germination, seedling length and seedling dry weight under laboratory germination tests. Of the various treatments, 50 and 200mT for 2h yielded the peak performance. Exposure of seeds to magnetic fields improved seed coat membrane integrity and reduced the cellular leakage and electrical conductivity. Treated seeds planted in soil resulted in statistically higher seedling dry weight, root length, root surface area and root volume in 1-month-old seedlings. In germinating seeds, enzyme activities of alpha-amylase, dehydrogenase and protease were significantly higher in treated seeds in contrast to controls. The higher enzyme activity in magnetic-field-treated sunflower seeds could be triggering the fast germination and early vigor of seedlings.
向日葵（Helianthus annuus）种子在 0 到 250mT 的静磁场中暴露，强度每隔 50mT 分档，时间为 1-4 小时，每小时一档。在实验室发芽试验中，这些磁场处理向日葵种子可提高发芽速度、幼苗长度和幼苗干重。在各种处理中，50mT 和 200mT 处理 2 小时的效果最佳。磁场暴露可提高种皮膜完整性，减少细胞渗漏和电导率。在土壤中种植的经磁场处理的种子在 1 个月大的幼苗中，其幼苗干重、根长、根表面积和根体积的统计数据均较高。在发芽种子中，与对照相比，经磁场处理的种子中α-淀粉酶、脱氢酶和蛋白酶的酶活性显著升高。磁场处理向日葵种子中较高的酶活性可能引发快速发芽和幼苗活力早现。
