The plasticity of the photosynthetic apparatus and antioxidant responses are critical for the dispersion of Rhizophora mangle along a salinity gradient

Pereira Silva, Bruno and Saballo, Heloisa Maria and Moreira Lobo, Ana and Costa Lima Neto, Milton (2023) The plasticity of the photosynthetic apparatus and antioxidant responses are critical for the dispersion of Rhizophora mangle along a salinity gradient. Aquatic Botany, 185: 103609. ISSN 0304-3770

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Abstract

The physiological mechanisms responsible for salinity tolerance in Rhizophora mangle remain unclear. Moreover, the effects of climate change on the distribution and abundance of mangrove forests are unknown. Thus, to elucidate the possible factors responsible for saline tolerance in this species, we investigated the growth and physiological parameters in young plants cultivated in a saline gradient (0, 10, 35, and 70 ppt). Biometric indicators, water status parameters, cell integrity, ions concentrations in leaves and roots, pigment concentrations, chlorophyll a fluorescence, oxidative stress indicators, and antioxidant enzyme activities were evaluated. The results showed that R. mangle could grow in the absence (0 ppt) or moderate salinity (10 ppt). However, by increasing the salinity to sea level (35 ppt), the growth and development decreased compared to plants grown at ten ppt. In hypersalinity (70 ppt), plant growth and development are severely hampered. Under hypersalinity, the increased concentration of H2O2 promoted lipid peroxidation and membrane damage. The chlorophyll contents decreased, and accessory pigment concentrations increased. Moreover, the modulation of the quantum yield of PSII and the antioxidant system was crucial to avoiding photoinhibition and salinity tolerance in R. mangle.

Item Type:

Journal Article

Journal or Publication Title:

Aquatic Botany

Additional Information:

This is the author’s version of a work that was accepted for publication in Aquatic Botany. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Aquatic Botany, 185, 2022 DOI: 10.1016/j.aquabot.2022.103609

Uncontrolled Keywords:

/dk/atira/pure/subjectarea/asjc/1100/1110

Subjects:

?? antioxidant metabolismclimate changemangrovesphotosynthetic yieldplant scienceaquatic science ??

Departments:

Faculty of Science and Technology > Lancaster Environment Centre

ID Code:

185021

Deposited By:

ep_importer_pure

Deposited On:

27 Jan 2023 16:25

Refereed?:

Yes

Published?:

Published

Last Modified:

15 Jul 2024 23:23

URI:

https://eprints.lancs.ac.uk/id/eprint/185021