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Dynamic responses of root vigor, lipid peroxidation and antioxidant enzymes in Artemisia selengensis to long-term drought and re-watering

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Abstract

Artemisia selengensis is a typical wetland plant with valuable nutritional and medical purposes, and its growth and field distribution is highly dependent on water conditions. However, wetland hydrology is becoming more complex due to global climate change, and the future response of A. selengensis to water deficits and rehydration is uncertain. We here conducted simulations to investigate physiological variations in A. selengensis in response to varying degree of soil moisture (85–90%, 60–65%, 45–50%, and 30–35%) and re-watering. Results show that drought boosted root vigor and increased water and soil nutrient absorption in A. selengensis. As drought conditions progressed, the superoxide anion (\({\text{O}}_{2}^{ - }\)) and malondialdehyde content significantly increased. This led to increased activity of antioxidant enzymes, which significantly inhibited \({\text{O}}_{2}^{ - }\) content. Root vigor and peroxidase (POD) activity were fully recovered after rehydration. The \({\text{O}}_{2}^{ - }\) and MDA content, and catalase (CAT) activity also fully recovered under moderate and mild drought, although full recovery can take longer under severe drought. Superoxide dismutase (SOD) activity decreased significantly after rehydration, but SOD activity in drought conditions has not yet recovered to the control level. A. selengensis is drought tolerant due to its high root vigor and the regulation of antioxidant enzyme system. Our results may provide guidance for the future population dynamics of wetland ecosystems under climate change.

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Funding

This work was supported by Grants from the National Natural Science Foundation of China [42261010, 42061021].

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YCa and HH designed the experiment; HH, YC and JQ conducted the experiment and analyzed the data; HH composed the manuscript; YCa, KX and RL revised the manuscript. All authors read and approved the final manuscript.

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Correspondence to Yun Cao.

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The authors have no conflicts of interest to declare that are relevant to the content of this article.

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The work described here has not been published previously and was not considered for publication elsewhere before a decision was made by the journal. There is no conflict of interest in the submission of this manuscript, and the manuscript is approved by all the authors for publication.

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Huang, Hx., Cao, Y., Xin, Kj. et al. Dynamic responses of root vigor, lipid peroxidation and antioxidant enzymes in Artemisia selengensis to long-term drought and re-watering. Aquat Ecol 57, 321–335 (2023). https://doi.org/10.1007/s10452-023-10012-2

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  • DOI: https://doi.org/10.1007/s10452-023-10012-2

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