Ecophysiological plasticity of shallow and deep populations of the Mediterranean seagrasses Posidonia oceanica and Cymodocea nodosa in response to hypersaline stress

Sandoval‐Gil, Jose Miguel; Ruiz, Juan Manuel García; Marín-Guirao, Lázaro; Bernardeau-Esteller, Jaime; Sánchez-Lizaso, José Luis

doi:10.1016/j.marenvres.2013.12.011

Cited by 57 publications

(55 citation statements)

References 100 publications

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“…; Sandoval‐Gil et al . ). We are not able to explain this observation, which may be related to some turgor‐dependent process.…”

Section: Discussionmentioning

confidence: 97%

“…), and also documented in seagrass species subjected to hyper‐saline stress (Tyerman ; Sandoval‐Gil et al . , ; Marín‐Guirao et al . ).…”

Section: Discussionmentioning

confidence: 99%

“…In studies carried out in other geographic locations, the euryhaline Cymodocea nodosa consistently showed more negative values of leaf Ψ w and Ψ π (and higher Ψ p ) than the more stenohaline Posidonia oceanica (Sandoval‐Gil et al . , ). Similar divergences have been described between C. nodosa populations growing in open waters and in a hyper‐saline coastal lagoon (Sandoval‐Gil ).…”

Section: Discussionmentioning

confidence: 99%

“…; Sandoval‐Gil et al . , ; Marín‐Guirao et al . ), but their operation during desiccation stress remains unstudied.…”

Section: Introductionmentioning

confidence: 99%

“…Cymodocea nodosa and Z. marina are also considered eurybiontic, highly plastic species able to grow within a wide range of marine environments including hyper‐saline confined waters and inter‐tidal flats (Moore & Short ; Fernández‐Torquemada & Sánchez‐Lizaso ; Sandoval‐Gil et al . , ). Despite their high plasticity, these seagrass ecotypes and species maintain a characteristic, stable vertical distribution in Ria Formosa lagoon.…”

Section: Introductionmentioning

confidence: 99%

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Plant–water relations of intertidal and subtidal seagrasses

et al. 2014

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This work represents the first contribution to (i) examine the changes in plant‐water relations of an inter‐tidal seagrass during air exposure (Zostera noltii), and (ii) compare the water status descriptors between inter‐tidal‐ and subtidal‐adapted species (Cymodocea nodosa, Zostera marina). Two different morphotypes of Z. noltii that develop in the highest and lowest inter‐tidal levels in the Portuguese lagoon of Ria Formosa were exposed to natural emersion periods under laboratory conditions, and the evolution of leaf water relations and osmolytes (ions, proline and non‐structural carbohydrates) was measured. Both morphotypes regulated their water potential (Ψw) by reducing the osmotic potential (Ψπ) through osmolyte accumulation, but only high inter‐tidal plants were able to do this by adjusting the turgor pressure through cell wall hardening. This is a conservative mechanism for osmotic acclimation, which occurred only after long emersion periods (7 h). After a rapid increase in ion concentration under air exposure, the high inter‐tidal morphotype replaced them by more physiologically compatible solutes (proline and non‐structural carbohydrates) to maintain the osmotic adjustment. Altered ionic homeostasis was found in low inter‐tidal plants when exposed to such unnatural, long emersion periods. Osmotic unbalances were also observed during the submerged recovery phase. Descriptors of leaf pressure–volume (P–V) curves and Höfler diagrams were derived for seagrasses for the first time. They support the divergences in water relations observed between inter‐tidal and subtidal seagrasses according to their vertical distribution. More negative water and osmotic potentials and higher rigidity of cell walls (higher elastic modulus, ε) were found to be specific osmotic adaptations of seagrasses to the inter‐tidal.

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“…; Sandoval‐Gil et al . ). We are not able to explain this observation, which may be related to some turgor‐dependent process.…”

Section: Discussionmentioning

confidence: 97%

“…), and also documented in seagrass species subjected to hyper‐saline stress (Tyerman ; Sandoval‐Gil et al . , ; Marín‐Guirao et al . ).…”

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

“…; Sandoval‐Gil et al . , ; Marín‐Guirao et al . ), but their operation during desiccation stress remains unstudied.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Plant–water relations of intertidal and subtidal seagrasses

et al. 2014

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Effects of salinity on sprouting and growth of three submerged macrophytes

Xia

Zhu

et al. 2020

Ecohydrology

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Many freshwater ecosystems are facing salinity stress, but limited information is available about its effects on submerged macrophytes. Here, we assessed the effects of salinity on sprouting and growth of three submerged macrophytes-Potamogeton crispus, Hydrilla verticillata and Myriophyllum spicatum. We conducted experiments in the lab and the outdoor platform to test for the sprouting and growth responses of selected macrophytes to a gradient of salinity (0.32-10,000 mg Cl − L −1). Sprouting rate, biomass and other related physiological indices were measured in all treatments. We found that lower salinity (100 mg Cl − L −1) increased the turion sprouting rate, and higher salinity (greater than or equal to 5,000 mg Cl − L −1) significantly inhibited the sprouting of P. crispus turions. M. spicatum appeared to have higher tolerance of salinity than H. verticillata. The optimum salinity for the growth of H. verticillata and M. spicatum was 500-1,000 mg Cl − L −1 and 100-500 mg Cl − L −1 , respectively. Activity of superoxide dismutase (SOD) and production of malondialdehyde (MDA) differed in salinity levels between submerged macrophytes, and higher SOD activity was observed in M. spicatum. This study helped clarify how physiological response mechanisms affecting sprouting and growth of submerged macrophytes are inhibited under high salinity and suggested that SOD plays an important role in the resistance to oxidative stress induced by salinity.

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Genomics of Salinity

Bayer

2016

Plant Genomics and Climate Change

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Ecophysiological plasticity of shallow and deep populations of the Mediterranean seagrasses Posidonia oceanica and Cymodocea nodosa in response to hypersaline stress

Cited by 57 publications

References 100 publications

Plant–water relations of intertidal and subtidal seagrasses

Plant–water relations of intertidal and subtidal seagrasses

Effects of salinity on sprouting and growth of three submerged macrophytes

Genomics of Salinity

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