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Ruiz-Montoya L, Sandoval-Gil JM, Belando-Torrentes MD, Vivanco-Bercovich M, Cabello-Pasini A, Rangel-Mendoza LK, Maldonado-Gutiérrez A, Ferrerira-Arrieta A, Guzmán-Calderón JM. Ecophysiological responses and self-protective canopy effects of surfgrass (Phyllospadix torreyi) in the intertidal. MARINE ENVIRONMENTAL RESEARCH 2021; 172:105501. [PMID: 34656017 DOI: 10.1016/j.marenvres.2021.105501] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/04/2021] [Revised: 09/29/2021] [Accepted: 10/07/2021] [Indexed: 06/13/2023]
Abstract
Intertidal seagrasses are subjected to desiccation and direct solar radiation during low tides. It is assumed that the canopy structure can self-protect the underlying shoots during these events, although there is no evidence on a physiological basis. The physiological responses of the surfgrass Phyllospadix torreyi were examined when emerged during low tide, on i) shoots overlaying the canopy, and ii) shoots sheltered within the canopy. Leaf water potential and water content decreased in external leaves after emersion, and the higher concentration of organic osmolytes reflected osmoregulation. Additionally, these shoots also exhibited a drastic reduction in carbohydrates after re-immersion, likely from cellular damage. Lipid peroxidation and antioxidant activity increments were also detected, while photosynthetic efficiency strongly diminished from direct exposure to solar radiation. Conversely, the sheltered shoots did not dehydrate and solely accumulated some oxidative stress, likely resulting from the warming of the canopy. In conclusion, the leaf canopy structure buffers physiological stress in the sheltered shoots, thus acting as a self-protective mechanism to cope with emersion.
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Affiliation(s)
- Leonardo Ruiz-Montoya
- Universidad Autónoma de Baja California, Instituto de Investigaciones Oceanológicas, 22830, Ensenada, Baja California, Mexico
| | - Jose Miguel Sandoval-Gil
- Universidad Autónoma de Baja California, Instituto de Investigaciones Oceanológicas, 22830, Ensenada, Baja California, Mexico.
| | | | - Manuel Vivanco-Bercovich
- Universidad Autónoma de Baja California, Instituto de Investigaciones Oceanológicas, 22830, Ensenada, Baja California, Mexico
| | - Alejandro Cabello-Pasini
- Universidad Autónoma de Baja California, Instituto de Investigaciones Oceanológicas, 22830, Ensenada, Baja California, Mexico
| | - Laura Karina Rangel-Mendoza
- Universidad Autónoma de Baja California, Instituto de Investigaciones Oceanológicas, 22830, Ensenada, Baja California, Mexico
| | - Alejandra Maldonado-Gutiérrez
- Universidad Autónoma de Baja California, Instituto de Investigaciones Oceanológicas, 22830, Ensenada, Baja California, Mexico
| | - Alejandra Ferrerira-Arrieta
- Universidad Autónoma de Baja California, Instituto de Investigaciones Oceanológicas, 22830, Ensenada, Baja California, Mexico
| | - Jose Manuel Guzmán-Calderón
- Universidad Autónoma de Baja California, Instituto de Investigaciones Oceanológicas, 22830, Ensenada, Baja California, Mexico
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