Responses of dark respiration in the light to desiccation and temperature in the intertidal macroalga, Ulva lactuca (Chorophyta) during emersion

Zou, Dinghui; Gao, Kunshan; Xia, Jianrong; Xu, Ziqiang; Zhang, Xin; Liu, Shuxia

doi:10.2216/06-98.1

Cited by 17 publications

(12 citation statements)

References 63 publications

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“…Dark respiration increased in response to increasing incubation temperature without a clear optimum in any of the three species. This has also been show for other seaweeds (Stæhr and Wernberg ; Tait and Schiel ) and could reflect oxygen‐dependent thermal tolerance (Zou et al ). The increase in dark respiration rates at temperatures above T opt for photosynthesis would have contributed to the decrease in net photosynthesis, demonstrating how the metabolic costs keep going up whereas metabolic gains decline resulting in a negative balance at higher temperatures.…”

Section: Discussionsupporting

confidence: 71%

Physiological responses of habitat‐forming seaweeds to increasing temperatures

et al. 2016

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Kelps and fucoids are dominant habitat‐forming seaweeds along temperate rocky coastlines. Here, we tested the physiological performance of a dominant kelp (Ecklonia radiata) and two fucoids (Scytothalia dorycarpa and Sargassum fallax), distributed along the southwest coast of Australia. Photosynthesis and respiration were measured against increments in temperature for seaweeds collected along a latitudinal gradient in ocean temperature from Kalbarri (warm) to Hamelin Bay (cool). We found a similar decrease in photosynthetic activity from cooler to warmer latitudes in all three species. Seaweeds collected from warmer locations had significantly lower chlorophyll a concentration compared to cooler locations which could explain the lower levels of photosynthetic activity at warmer latitudes. The Q10 values for photosynthesis and respiration tended to decrease from cooler to warmer locations. For all species, the optimum temperature for net photosynthesis remained similar across the locations. However, within locations, the optimum temperature for S. fallax (25.2°C) was significantly higher than E. radiata (24.0°C) and S. dorycarpa (23.6°C). The reduction rates of net photosynthesis observed after optimum temperature showed the greatest variation among the species within and across locations. A thermal performance breadth analysis revealed a broader performance range for S. fallax (21.5–28.4°C) followed by E. radiata (21.2–26.5°C) and S. dorycarpa (21.4–25.8°C). These results highlight the differences in temperature sensitivity among the three species which help explain their current distributional patterns and have potential implications for future responses to future ocean warming.

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Section: Discussionsupporting

confidence: 71%

Physiological responses of habitat‐forming seaweeds to increasing temperatures

et al. 2016

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“…2 and 3), is consistent with a high influence of phytoplankton in CO 2 fluxes. CRR lower than OCR is a pattern commonly observed for primary producers (Raven 1972a;Tcherkez et al 2008), including macroalgae (Zou et al 2007) and phytoplankton (Xue et al 1996). CRR is expected to be lower than OCR in photosynthesizing autothrophs because CRR is linked to the Krebs cycle in the cell, and this cycle is inhibited while photosynthesis takes place (Tcherkez et al 2005).…”

Section: Respiration In the Lightmentioning

confidence: 92%

Measurement of planktonic CO₂ respiration in the light

Carvalho

Eyre

2012

Limnology & Ocean Methods

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Respiration is an essential physiological process for all organisms and is a significant component of the global carbon cycle. However, CO 2 release rates in the light (CRR) by aquatic communities have seldom been measured directly; instead, the typical procedure is to measure oxygen consumption rates in the dark (OCR) and assume that they are approximately equivalent to CRR. Here we describe a method to measure CRR (and consequently gross photosynthesis rates) based on 13 C addition to incubation water in a closed system. We quantified planktonic CRR in situ in a lake, and also in laboratory experiments, where we tested the effects of temperature and irradiance on respiration rates. We also measured O 2 rates (respiration in the dark and net production in the light) to compare with those based on CO 2 , and found that in the lake, these rates were similar both for photosynthesis and respiration. In laboratory, however, they were very different, with CO 2 -based photosynthesis being higher, and CRR being lower than correspondent O 2 rates. These findings show that the usual approach of assuming similar OCR and CRR can be erroneous. We also found that higher temperature and irradiance caused higher CRR. The method was successful to provide CRR and photosynthetic measurements, but would greatly benefit from more precise techniques to measure the concentration of dissolved inorganic carbon in water.

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“…Among the Ulvophyceae, members of the Genotypus Ulva are widely distributed, abundant marine macroalgae, living in the intertidal zone and hence tolerating periodic desiccation by special physiological adaptation (Zou et al, 2007; Gao et al, 2012). The Trentepohliales is an entirely terrestrial order within the Ulvophyceae, and its members form filaments of uninucleate cells, which have many specialized features, e.g., a phragmoplast-like cytokinesis, presence of plasmodesmata and multilayered structures (Leliaert et al, 2012), and also commonly form lichens (Nelsen et al, 2011).…”

Section: Phylogenetic Relationships In Green Algaementioning

confidence: 99%

Desiccation stress and tolerance in green algae: consequences for ultrastructure, physiological and molecular mechanisms

Holzinger¹,

Karsten²

2013

Front. Plant Sci.

235

192

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Although most green algae typically occur in aquatic ecosystems, many species also live partly or permanently under aeroterrestrial conditions, where the cells are exposed to the atmosphere and hence regularly experience dehydration. The ability of algal cells to survive in an air-dried state is termed desiccation tolerance. The mechanisms involved in desiccation tolerance of green algae are still poorly understood, and hence the aim of this review is to summarize recent findings on the effects of desiccation and osmotic water loss. Starting from structural changes, physiological, and biochemical consequences of desiccation will be addressed in different green-algal lineages. The available data clearly indicate a range of strategies, which are rather different in streptophycean and non-streptophycean green algae. While members of the Trebouxiophyceae exhibit effective water loss-prevention mechanisms based on the biosynthesis and accumulation of particular organic osmolytes such as polyols, these compounds are so far not reported in representatives of the Streptophyta. In members of the Streptophyta such as Klebsormidium, the most striking observation is the appearance of cross-walls in desiccated samples, which are strongly undulating, suggesting a high degree of mechanical flexibility. This aids in maintaining structural integrity in the dried state and allows the cell to maintain turgor pressure for a prolonged period of time during the dehydration process. Physiological strategies in aeroterrestrial green algae generally include a rapid reduction of photosynthesis during desiccation, but also a rather quick recovery after rewetting, whereas aquatic species are sensitive to drying. The underlying mechanisms such as the affected molecular components of the photosynthetic machinery are poorly understood in green algae. Therefore, modern approaches based on transcriptomics, proteomics, and/or metabolomics are urgently needed to better understand the molecular mechanisms involved in desiccation-stress physiology of these organisms. The very limited existing information is described in the present review.

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Responses of dark respiration in the light to desiccation and temperature in the intertidal macroalga, Ulva lactuca (Chorophyta) during emersion

Cited by 17 publications

References 63 publications

Physiological responses of habitat‐forming seaweeds to increasing temperatures

Physiological responses of habitat‐forming seaweeds to increasing temperatures

Measurement of planktonic CO₂ respiration in the light

Desiccation stress and tolerance in green algae: consequences for ultrastructure, physiological and molecular mechanisms

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Responses of dark respiration in the light to desiccation and temperature in the intertidal macroalga, Ulva lactuca (Chorophyta) during emersion

Cited by 17 publications

References 63 publications

Physiological responses of habitat‐forming seaweeds to increasing temperatures

Physiological responses of habitat‐forming seaweeds to increasing temperatures

Measurement of planktonic CO2 respiration in the light

Desiccation stress and tolerance in green algae: consequences for ultrastructure, physiological and molecular mechanisms

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Measurement of planktonic CO₂ respiration in the light