Increased Temperature and Nitrogen Enrichment Inhibit the Growth of the Golden Tide Blooming Macroalgae Sargassum horneri in the Yellow Sea, China

Li, Xuebing; Liu, Yanhong; Wang, Chuchu; Ji, Chenkai; Xu, Juntian

doi:10.3390/jmse10111692

Cited by 3 publications

(4 citation statements)

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“…The nitrogen content of 50 µmol L −1 in natural seawater was observed in the sampling sites, and in previous research, it was reported that the inorganic nitrogen content in golden tide bloom area increased by 3-4 times [19]. In all the treatments, the concentration of inorganic phosphorus (P) was set to 10 µmol L −1 through the addition of KH2PO4 to avoid P limitation [20,21]. Other conditions were the same as the temporary culture, and the seawater medium was renewed every two days.…”

Section: Experimental Designmentioning

confidence: 84%

Effects of UVR on Photosynthesis in Sargassum horneri (Turner) C. Agardh Adapted to Different Nitrogen Levels

Jiang

et al. 2023

JMSE

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In recent years, golden tides caused by drifting Sargassum horneri (Turner) C. Agardh have caused serious ecological disasters in coastal areas of China. Eutrophication is an important cause of the formation of the golden tide. Additionally, the drifting population on the surface of the ocean is exposed to more ultraviolet radiation (UVR) than the attached population on the sea floor. In this study, the thalli of S. horneri were cultivated under two levels of nitrogen (LN: natural seawater, in which the concentration of NO3−-N was 1 µmol L−1; HN: NO3−-enriched seawater, in which the concentration of NO3−-N was 200 μmol L−1) for 6 days with low photosynthetically active radiation (PAR), and then exposed to three levels of radiation (P: photosynthetically active radiation (PAR), 400–700 nm; PA: PAR + UVA, 320–700 nm; PAB: PAR + UVA + UVB, 280–700 nm) under each level of nitrogen for 2 h to investigate the effects of high UVR and nitrogen on photosynthesis. The results showed that the high level of N (HN) only enhanced the synthesis of pigments after 6 days of pre-cultivation under low PAR. After 2 h of high UVR exposure, high P, PA, and PB decreased the maximum photochemical quantum yield (Fv/Fm) and increased non-photochemical quenching (NPQ) in S. horneri regardless of the N level, and PAB significantly decreased Fv/Fm compared to PA under the LN condition alone. Under the LN condition, compared to the P group, PA and PAB significantly promoted the synthesis of carotenoids. Under the HN condition, compared to the P group, PAB increased the absorbed flux by active RCs (ABS/RC) and dissipated the energy flux by active RCs (DI0/RC) in S. horneri alone. Furthermore, HN increased Fv/Fm, ABS/RC, and DI0/RC more in S. horneri with PAB in comparison to those in the LN and PAB group. However, no significant differences in these parameters were observed between the LN and HN conditions under the same UVR treatments. These results demonstrate that drifting S. horneri on the surface of seawater could be inhibited by the high P; however, S. horneri living in eutrophic high-nitrogen seawater may have a stronger ability to resist high UVR damage, especially with regard to PAB radiation, which may be one of the reasons for the formation of golden tides in coastal seawater.

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Section: Experimental Designmentioning

confidence: 84%

Effects of UVR on Photosynthesis in Sargassum horneri (Turner) C. Agardh Adapted to Different Nitrogen Levels

Jiang

et al. 2023

JMSE

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“…ESS1 ( Kishimoto et al., 2019 ; Khoa et al., 2021 ). Since heat stress generally reduces nitrogen uptake and growth in algae ( Gerard, 1997 ; Hay et al., 2010 ; Gouvêa et al., 2017 ; Endo et al., 2020 ; Fernández et al., 2020 ; Wu et al., 2022 ), it is important to address whether the establishment of heat stress memory modulates the uptake of nitrogen sources under heat stress conditions in algae. Therefore, in this study, we identified ‘ Bangia ’ sp.…”

Section: Discussionmentioning

confidence: 99%

“…High temperature usually inhibits the growth of macroalgae ( Endo et al., 2020 ; Fernández et al., 2020 ; Wu et al., 2022 ). In addition, high temperature reduces nitrogen uptake and nitrogen content in these algae ( Gerard, 1997 ; Hay et al., 2010 ; Gouvêa et al., 2017 ).…”

Section: Introductionmentioning

confidence: 99%

“…Thus, growth retardation and reduced nitrogen accumulation are tightly correlated, which is consistent with the finding that nitrogen is an indispensable macronutrient for plant growth in most terrestrial and aquatic ecosystems ( Edward and Richard, 2001 ; Witte, 2011 ). Indeed, nitrogen fertilization promotes growth under heat stress conditions in brown, green, and red algae ( Wang et al., 2014 ; Gouvêa et al., 2017 ; Fernández et al., 2020 ; Wu et al., 2022 ; Wang et al., 2023 ). Moreover, high temperature stimulates nitrogen accumulation in meristems of the brown alga Eisenia bicyclis and the green alga Ulva prolifera ( Endo et al., 2020 ; Sato et al., 2021 ).…”

Section: Introductionmentioning

confidence: 99%

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Heat stress memory differentially regulates the expression of nitrogen transporter genes in the filamentous red alga ‘Bangia’ sp. ESS1

Sato,

Khoa,

Mikami

2024

Front. Plant Sci.

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IntroductionTo withstand high temperatures that would be lethal to a plant in the naïve state, land plants must establish heat stress memory. The acquisition of heat stress tolerance via heat stress memory in algae has only been observed in the red alga ‘Bangia’ sp. ESS1.MethodsIn this study, we further evaluated the intrinsic ability of this alga to establish heat stress memory by monitoring hydrogen peroxide (H2O2) production and examining the relationship between heat stress memory and the expression of genes encoding nitrogen transporters, since heat stress generally reduces nitrogen absorption. Next, genes encoding nitrogen transporters were selected from our unpublished transcriptome data of ‘Bangia’ sp. ESS1.ResultsWe observed a reduction in H2O2 content when heat stress memory was established in the alga. In addition, six ammonium transporter genes, a single-copy nitrate transporter gene and two urea transporter genes were identified. Two of these nitrogen transporter genes were induced by heat stress but not by heat stress memory, two genes showed heat stress memory–dependent expression, and one gene was induced by both treatments. Heat stress memory therefore differentially regulated the expression of the nitrogen transporter genes by reducing heat stress–inducible gene expression and inducing heat stress memory–dependent gene expression.DiscussionThese findings point to the functional diversity of nitrogen transporter genes, which play different roles under various heat stress conditions. The characteristic effects of heat stress memory on the expression of individual nitrogen transporter genes might represent an indispensable strategy for reducing the threshold of sensitivity to recurrent high-temperature conditions and for maintaining nitrogen absorption under such conditions in ‘Bangia’ sp. ESS1.

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The Effect of Temperature on the Growth of Holopelagic Sargassum Species

et al. 2023

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Holopelagic Sargassum species have bloomed recurrently in the northern tropical Atlantic since 2011, causing socioeconomic and environmental problems. Little is known about their basic biology and responses to the abiotic environment. The aim of this study was to determine how temperature affects the growth rates of the genotypes S. fluitans III, S. natans I, and S. natans VIII that predominate in these blooms. The growth rates were evaluated in specially designed ex situ systems between 22 and 31 °C, which corresponds with the natural temperature range of these seaweeds in the northern tropical Atlantic. All the genotypes had decreased growth rates at 31 °C, and they varied in their response to temperature, with S. fluitans III presenting a maximal rate of 0.096 doublings· day−1 (doubling its weight in 10.5 d) at 28 °C and S. natans VIII a minimal rate of 0.045 doublings· day−1 (doubling its weight in 22.2 d) at 31 °C. In addition, the response to the temperature varied depending on the time of the year. Understanding the role of temperature in the growth of holopelagic Sargassum genotypes, amongst other factors influencing their physiology (such as nutrients, salinity tolerance, or light, including their interactions), could help to understand the dynamics of the recent blooms in the tropical North Atlantic.

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Increased Temperature and Nitrogen Enrichment Inhibit the Growth of the Golden Tide Blooming Macroalgae Sargassum horneri in the Yellow Sea, China

Cited by 3 publications

References 74 publications

Effects of UVR on Photosynthesis in Sargassum horneri (Turner) C. Agardh Adapted to Different Nitrogen Levels

Effects of UVR on Photosynthesis in Sargassum horneri (Turner) C. Agardh Adapted to Different Nitrogen Levels

Heat stress memory differentially regulates the expression of nitrogen transporter genes in the filamentous red alga ‘Bangia’ sp. ESS1

The Effect of Temperature on the Growth of Holopelagic Sargassum Species

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