Sunita Kataria, Md Intesaful Haque, Andrej Filacek, Maria Barboricova, Jana Ferencova, Meeta Jain, Anshu Rastogi, Marian Brestic
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引用次数: 0
Abstract
This study investigates the potential of magnetic iron oxide nanoparticles (MIONPs) in mitigating ultraviolet-B radiation (UV-B) induced physiological damage in radish (Raphanus sativus L.) and mung bean (Vigna radiata). Screening of the seed vigour indices identified 1500 mg L-1 MIONPs as the optimal concentration for radish and 100 mg L-1 for mung bean for seed vigour improvement. After the first true leaf appeared (~15 days), plants were exposed to different UV-B intensities: control (UV0, 0 mW m-2), moderate (UV1, 26 mW m-2), and high (UV2, 53 mW m-2), with or without foliar MIONPs application. Results showed that UV-B significantly decreased the net photosynthesis rate (Pn) by 32% in radish and 65% in mung bean after UV2 exposure. Fluorescence parameters, including photosystem II (PSII) efficiency and photosynthetic performance (PIabs), were also impaired by UV-B. UV-B stress led to a decline in plant growth, leaf area, biomass accumulation, and chlorophyll content while increasing antioxidant enzyme activities, flavonoids, anthocyanins, malondialdehyde (MDA), and hydrogen peroxide (H2O2) levels. However, MIONPs treatment enhanced UV-B tolerance by improving pigment content, PSII efficiency, Pn, leaf area, and biomass accumulation while reducing MDA and H2O2 levels, thus improving overall plant physiological health. In the leaf model of energy flux, MIONPs-treated plants showed more active reaction centers and improved electron transport. The OJIP curves differed under UV-B stress, with increasing UV-B stress showing decreased fluorescence intensity at the IP phase. However, plants treated with MIONPs showed higher fluorescence intensity specifically at the IP phase, suggesting their protective effect. The UV sensitivity index (UV-SI) revealed that mung bean is more UV-sensitive than radish. MIONPs treatment increased UV-SI values and enhanced the plant tolerance towards UV-B. The results suggest that the application of MIONPs could improve UV-B resistance in future agricultural practices.
期刊介绍:
Physiologia Plantarum is an international journal committed to publishing the best full-length original research papers that advance our understanding of primary mechanisms of plant development, growth and productivity as well as plant interactions with the biotic and abiotic environment. All organisational levels of experimental plant biology – from molecular and cell biology, biochemistry and biophysics to ecophysiology and global change biology – fall within the scope of the journal. The content is distributed between 5 main subject areas supervised by Subject Editors specialised in the respective domain: (1) biochemistry and metabolism, (2) ecophysiology, stress and adaptation, (3) uptake, transport and assimilation, (4) development, growth and differentiation, (5) photobiology and photosynthesis.