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ORIGINAL RESEARCH article

Front. Plant Sci.
Sec. Functional Plant Ecology
Volume 15 - 2024 | doi: 10.3389/fpls.2024.1471742
This article is part of the Research Topic Application of Plants in Wetland Ecological Engineering View all 13 articles

Response of the photosynthetic characteristics and antioxidant system of Suaeda salsa to the changes of underground brine depth

Provisionally accepted
Ping Wang Ping Wang 1Wenjing Xu Wenjing Xu 1Zehao Zhang Zehao Zhang 1Zhanyong Fu Zhanyong Fu 2*Tian Li Tian Li 1Jingkuan Sun Jingkuan Sun 1
  • 1 Shandong University of Aeronautics, Binzhou, China, Binzhou, Shandong Province, China
  • 2 China University of Mining and Technology, Beijing, Beijing, China

The final, formatted version of the article will be published soon.

    Water and salt conditions are key factors influencing vegetation growth on shell island in the Yellow River Delta. The laboratory simulation experiment was carried out to investigate the effect of the changes of underground brine depth on Suaeda salsa using four levels of groundwater: 0 cm, 15 cm, 30 cm and 45 cm. The results showed that different underground brine depths had significant impacts on the photosynthetic characteristics and antioxidant system of S. salsa, and 0-30 cm underground brine depth was suitable for S. salsa growth. The net photosynthetic rate (Pn), transpiration rate (Tr), stomatal conductance (Gs), light utilization efficiency (LUE) and carboxylation efficiency (CE) of S. salsa increased first and then decreased with increasing depth of underground brine. The stomatal limitation value (Ls) and WUE of S. salsa reached the peak value at the groundwater depth of 0 cm, and water use efficiency was reduced by 19.4%, 8.0% and 8.6% at 15 cm, 30 cm, and 45 cm, respectively, compared to the 0 cm treatment. With the deepening of underground brine depth, the value of LUE and CE firstly increased and then decreased, and reached the peak value when the depth was 30 cm. The antioxidant enzyme (SOD, POD and CAT) activities of S. salsa decreased and then increased with the increase of underground brine depth. The enzyme activities were the lowest when the underground brine depth was 30 cm. As the groundwater depth increased, MDA content decreased and then increased. The highest degree of membrane peroxidation in S. salsa leaves was observed at the depth of 45 cm. Our study reveals that the antioxidant capacity of S. salsa was weakened at the underground brine depth of 45 cm and the growth of S. salsa was inhibited.

    Keywords: underground brine depth, Shell Island, Photosynthetic characteristics, antioxidant system, Suaeda salsa

    Received: 28 Jul 2024; Accepted: 23 Sep 2024.

    Copyright: © 2024 Wang, Xu, Zhang, Fu, Li and Sun. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

    * Correspondence: Zhanyong Fu, China University of Mining and Technology, Beijing, Beijing, China

    Disclaimer: All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article or claim that may be made by its manufacturer is not guaranteed or endorsed by the publisher.