Magnetobiology is a new synthetic discipline encompassing the principles and techniques of many sciences from engineering, physics, chemistry, biology and centered around biophysics. It studies biological effects of oscillating or static and low-frequency magnetic fields on tissues without causing heating of tissues. Magnetic and electromagnetic treatments are being used in agriculture for seed priming as a non-invasive technique to improve the germination and vigor of seeds and finally yield. The results obtained by magnetopriming indicate that magnetic field acts as a bio-stimulant which can be considered as an alternative to chemical and biological methods for the pre-sowing treatment of the seeds.1,2 Several reports also show that the magnetic field exposure increases germination of low viability seeds and improves their quality and sprouting rate.2,3 These effects may be because of interaction of magnetic field with ionic current in the plant embryo cell membrane that induces changes in both osmotic pressure and ionic concentrations on both sides of the membrane. 4 Changes in the ionic fluxes across cell membrane cause alterations in the mechanism of water uptake, as osmoregulation in embryo cells is controlled by the ionic transport across the membrane. 5 The hypotheses that explain biological effects of magnetic field are based on fragmentary studies and in plants, cryptochromes are believed to be the possible candidate of magnetoreception. 6 Two mechanisms of magnetoreception that are currently receiving attention are (1) the "radical-pair mechanism" consisting of modulation of singlet-triplet interconversion rates of a radical pair by weak magnetic fields, (2) the "ion cyclotron resonance" that revolves around the fact that ions should circulate Priming of soybean seeds with static magnetic field exposure of 200 mt (1 h) and 150 mt (1 h) resulted in plants with enhanced performance index (Pi). the three components of Pi i.e., the density of reaction centers in the chlorophyll bed (rC/aBS), exciton trapped per photon absorbed (ϕpo) and efficiency with which a trapped exciton can move in electron transport chain (Ψo) were found to be 17%, 27% and 16% higher, respectively in leaves from 200 mt (1 h) treated compared with untreated seeds. EPr spectrum of o 2 .--PBN adduct revealed that the o 2 .-radical level was lower by 16% in the leaves of plants that emerged from magnetic field treatment. our study revealed that magnetoprimed seeds have a long lasting stimulatory effect on plants as reduced superoxide production and higher performance index contributed to higher efficiency of light harvesting that consequently increased biomass in plants that emerged from magnetoprimed seeds .Superoxide radical production and performance index of Photosystem II in leaves from magnetoprimed soybean seeds Previously, we have reported the effect of static magnetic field on the seeds of soybean [Glycine max (L) Merr. var: JS-335] by exposing the seeds to different magnetic field strength from 0-300 mT in steps of 50 mT for ...