Close but distant: Emersion promotes ecophysiological differentiation between two rhodophytes within an estuarine intertidal zone

Pedro, Raquel Sánchez de; Niell, F. Xavier; Carmona, Raquel

doi:10.1016/j.jembe.2021.151664

Cited by 4 publications

(2 citation statements)

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“…Our results are also consistent with Cunha and Duarte (2002) who registered a lower photosynthetic activity of B. montagnei (measured as photosynthetic oxygen evolution) under increasing irradiances compared to B. calliptera. In our study, the quantum yield of the macroalgae cultured under the lowest light stress condition (i.e., 170 μmol photons m -2 s -1 ) was similar to the quantum yield of B. scorpioides (Hudson) Montagne subjected to lowest desiccation stress (Sańchez de Pedro et al, 2022). Thereby, quantum yield is a reliable physiological parameter to access photosynthetic performance in Bostrychia species.…”

Section: Discussionsupporting

confidence: 71%

“…Fluorescence techniques have been extensively used to estimate the photosynthetic performance of marine phototrophic organisms during the last 20 years (Figueroa et al, 2019). However, the photosynthetic performance of Bostrychia species was only recently estimated using fluorescence techniques after species had been subjected to salt stress (Gambichler et al, 2021b), desiccation stress (Sańchez de Pedro et al, 2022), ocean acidification (Borburema et al, 2022a), and to temperature and salinity stress (Borburema et al, 2022b). Photosynthetic performance of Bostrychia species based on chlorophyll a fluorescence after specimens have been subjected to light stress has not yet been explored.…”

Section: Introductionmentioning

confidence: 99%

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Photosynthetic performance, growth, pigment content, and photoprotective compounds of the mangrove macroalgae Bostrychia calliptera and Bostrychia montagnei (Rhodophyta) under light stress

Borburema

Graiff²,

Marinho‐Soriano³

et al. 2022

Front. Mar. Sci.

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Increased solar radiation on the Earth’s surface is expected due to global change. Mangrove macroalgae can be negatively affected by increased solar radiation, since some species, such as Bostrychia spp. have been characterized as typical “shade” plants. Thus, we investigated the effects of increasing photon flux densities (PFDs: 170, 267, 443, 638, and 1155 µmol photons m–2 s–1) on the physiological performance of Bostrychia calliptera and Bostrychia montagnei from a tropical mangrove. Several photosynthesis–related parameters indicated that both species decreased their photosynthetic performance under increasing PFDs, with photosynthesis of B. montagnei being more affected than that of B. calliptera. Bostrychia calliptera exhibited highest growth under 638 µmol photons m–2 s–1 while at 1155 µmol photons m–2 s–1 it was inhibited. The highest growth of Bostrychia montagnei was observed under 267 µmol photons m–2 s–1. Higher PFDs led to growth inhibition. The phycobiliprotein and chlorophyll a content of B. montagnei was degraded under increased PFDs. In B. calliptera only chlorophyll a degradation was observed. The mycosporine-like amino acid contents (photoprotective metabolites) of both species were degraded under increasing PFDs, which was more pronounced in B. montagnei. Our results demonstrated that increased solar radiation on estuarine tropical ecosystems will be detrimental to the physiological performance of B. calliptera and B. montagnei. Our results also demonstrated that B. montagnei was more negatively affected by increased light stress than B. calliptera. This can explain its preferential occurrence in more shaded microhabitats compared to B. calliptera. Our data document for the first time light acclimation in the studied macroalgae and the deleterious effects of increased light stress on the genus Bostrychia.

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Section: Discussionsupporting

confidence: 71%