Static magnetic field treatment enhanced photosynthetic performance in soybean under supplemental ultraviolet-B radiation

Abstract

The study was performed to analyze the impact of seed pretreatment by static magnetic field (SMF) of 200 mT for 1 h on photosynthetic performance of soybean (Glycine max) seedlings under ambient ( a UV-B) and supplemental ultraviolet-B ( a+s UV-B) stress. Ambient and supplemental UV-B were found to decrease the plant growth, chlorophyll concentration, PSII efficiency, selected JIP-test parameters such as F v /F m , φEo, ΔV(I-P), PI ABS , PI total , and rate of photosynthesis in the leaves of soybean seedlings emerged from untreated (UT) seeds. a UV-B and a+s UV-B were observed to increase the synthesis of UV-B-absorbing substances (UAS), reactive oxygen species (ROS) like superoxide radical (O 2•− ) and hydrogen peroxide (H 2 O 2 ), antioxidants like ascorbic acid and α-tocopherol and decrease the nitrate reductase (NR) activity; subsequently, it results in a decreased rate of photosynthesis, biomass accumulation, and yield. However, our results provided evidence that SMF pretreatment increased the tolerance of soybean seedlings to UV-B radiation by increased NO content and NR activity; higher efficiency of PSII, higher values of φEo, ΔV(I-P), PI ABS , and PI total , decreased intercellular CO 2 concentration, lower amount of UAS, ROS, and antioxidants that consequently improve the yield of soybean plants under a UV-B as well as a+s UV-B stress. Thus, our results suggested that SMF pretreatment mitigates the adverse effects of UV-B stress by the enhancement in photosynthetic performance along with higher NO content which may be able to protect the plants from the deleterious effects of oxidative stress caused by UV-B irradiation.

Use of Synchrotron Phase-Sensitive Imaging for the Investigation of Magnetopriming and Solar UV-Exclusion Impact on Soybean (Glycine max) Leaves

“…It has been suggested that MF perception/signaling in plants is regulated by blue light photoreceptors-cryptochromes. It has also been found that reactive oxygen species (ROS) and nitric oxide (NO) are the signaling molecules for magnetopriming-induced seed germination, plant growth, and photosynthesis [29,56]. The participation of NO through nitric oxide synthase enzyme was confirmed in SMF-induced tolerance towards UV-B stress in The second-order (2 • ) minor veins also showed an increase of 27% in width and 8% in length by SMF treatment in the OC group (Figure 4b,c).…”

“…Plants showed reactions to magnetic fields based on the intensity, flux density, and exposure time [16,25,26]. The enhanced germination percentage improved plant growth, photosynthesis and yield were observed due to SMF pre-treatment of seeds as compared to the untreated seeds under non-stress as well as under abiotic stresses such as salt, water, UV-B, and arsenic toxicity [8,[15][16][17][18][27][28][29]. The effect of magnetopriming on plants can be best understood in the framework of two mechanisms, namely the ion cyclotron-resonance (ICR) and the radical-pair models (RPM) [16,30].…”

“…Magnetic field treatment with low flux densities and the exclusion of solar UV radiation are the two parts of radiation biology that have positive stimulating effects on leaf growth, venation, and photosynthesis [8,18,29]. The network of leaf venation is composed of minor veins and a midrib (major conducting vein), which provides mechanical stability to the leaf structure.…”

Effect of Magnetopriming on Photosynthetic Performance of Plants

“…The primary function of photosynthesis is to convert light energy into chemical energy, which is the key function in plant life and the food chain for animals, but this can be influenced by many environmental factors. Several studies have shown that the photosynthetic process can be affected by high or low light intensity, high or low temperature, heat, salinity, drought, UV-B stress, electrical signals, and geomagnetic field intensity [1][2][3][4][5][6][7][8]. The main can be affected by high or low light intensity, high or low temperature, heat, salinity, drought, UV-B stress, electrical signals, and geomagnetic field intensity [1][2][3][4][5][6][7][8].…”

“…Several studies have shown that the photosynthetic process can be affected by high or low light intensity, high or low temperature, heat, salinity, drought, UV-B stress, electrical signals, and geomagnetic field intensity [1][2][3][4][5][6][7][8]. The main can be affected by high or low light intensity, high or low temperature, heat, salinity, drought, UV-B stress, electrical signals, and geomagnetic field intensity [1][2][3][4][5][6][7][8]. The main characteristics of photosynthetic damage indicate lower activity of photosynthetic enzymes, decreased assimilation of carbon dioxide (CO2), quantum yield of photosystem II (ΦPSII) and increased nonphotochemical quenching (NPQ) [6,7,[9][10][11].…”