Dynamics of radial oxygen loss in mangroves subjected to waterlogging

Tidal flooding can directly result in oxygen (O 2 ) shortage, however the functions of root aeration in flooding tolerance and O 2 dynamics within mangroves are still poorly understood. Thus, in this study, the correlations among waterlogging tolerance, root porosity and O 2 movement within the plan...

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Bibliographic Details
Published in:Ecotoxicology (London) 2020-08, Vol.29 (6), p.684-690
Main Authors: Cheng, Hao, Wu, Mei-Lin, Li, Chang-Da, Sun, Fu-Lin, Sun, Cui-Ci, Wang, You-Shao
Format: Article
Language:English
Subjects:
Aeration
Anaerobic conditions
Correlation analysis
Dynamics
Earth and Environmental Science
Ecology
Ecotoxicology
Environment
Environmental Management
Flooding
Mangroves
Oxygen
Porosity
Regions
Roots
Stomata
Tidal flooding
Tidal floods
Waterlogging
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Summary:Tidal flooding can directly result in oxygen (O 2 ) shortage, however the functions of root aeration in flooding tolerance and O 2 dynamics within mangroves are still poorly understood. Thus, in this study, the correlations among waterlogging tolerance, root porosity and O 2 movement within the plants were investigated using two mangrove species ( Aegiceras corniculatum and Bruguiera gymnorrhiza ) and a semi-mangrove Heritiera littoralis . Based on the present data, the species A. corniculatum and B. gymnorrhiza , which possessed higher root porosity, exhibited higher waterlogging tolerance, while H. littoralis is intolerant. Increased root porosity, leaf stoma, and total ROL were observed in the roots of A. corniculatum and B. gymnorrhiza growing in stagnant solution when compared to respective aerated controls. As for ROL spatial pattern along roots, external anaerobic condition could promote ROL from apical root regions but reduce ROL from basal roots, leading to a ‘tighter barrier’. In summary, the present study indicated that the plants (e.g., A. corniculatum and B. gymnorrhiza ) prioritized to ensure O 2 diffusion towards root tips under waterlogging by increasing aerenchyma formation and reducing O 2 leakage at basal root regions.
ISSN:0963-9292
1573-3017
DOI:10.1007/s10646-020-02221-4