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Effects of mycorrhizal symbiosis and Ulva lactuca seaweed extract on growth, carbon/nitrogen metabolism, and antioxidant response in cadmium-stressed sorghum plant

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In our study on the effect of cadmium (Cd) toxicity (200 µM) on the growth of Sorghum bicolor (L.) Moench plants, cultivated with arbuscular mycorrhizal fungi (AMF) (Glomus intraradices) and/or under seaweed treatment (3% Ulva lactuca extract) (U. lactuca), we found that AMF increased the tolerance of sorghum to cadmium stress, either alone or in combination with the seaweed treatment. Morphological parameters were higher in these two culture conditions, with increased chlorophyll content. AMF reduced Cd accumulation in roots and inhibited its translocation to the aerial part, while seaweed treatment alone significantly increased Cd accumulation in leaves and roots without affecting plant growth compared to stressed witnesses. Treatment with AMF and/or U. lactuca attenuated oxidative stress, measured by activation of superoxide dismutase, and resulted in a significant decrease in malondialdehyde and superoxide ions (O2) in treated plants. Furthermore, it induced significant alterations in carbon and nitrogen metabolic pathways, with a significant increase in the activity of enzymes such as glutamine synthetase, glutamate synthase (GOGAT), glutamate dehydrogenase, phosphoenolpyruvate carboxylase, aspartate aminotransferase and isocitrate dehydrogenase in the leaves of each treated plant. These results confirm that AMF, U. lactuca algae extract and their combination can improve the biochemical parameters of sorghum under Cd stress, through modification of the antioxidant response on one hand, and improved nitrogen absorption and assimilation efficiency on the other.

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Conceptualization: Anass Kchikich; Methodology: Anass Kchikich, Reda Ben Mrid, Ennoury Abdelhamid, Zoulfa Roussi, Nada Nhhala, Bouchra Ben Mrid, Ayoub kounnoun, Mohammed EL-Maadoudi. Formal analysis investigation: Nhiri Mohamed, Reda BenMrid, Anass Kchikich; writing original draft: Anass Kchikich, Zoulfa Roussi, Nada Nhhala, Bouchra Benmrid; Writing-review and editing: Reda Ben Mrid, Anass Kchikich, Mohamed Nhiri.

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Correspondence to Anass Kchikich.

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Kchikich, A., Roussi, Z., Krid, A. et al. Effects of mycorrhizal symbiosis and Ulva lactuca seaweed extract on growth, carbon/nitrogen metabolism, and antioxidant response in cadmium-stressed sorghum plant. Physiol Mol Biol Plants (2024). https://doi.org/10.1007/s12298-024-01446-5

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  • DOI: https://doi.org/10.1007/s12298-024-01446-5

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