Photosynthetic performance of freshwater Rhodophyta in response to temperature, irradiance, pH and diurnal rhythm

Necchi, Orlando; Zucchi, Marcelo Ribeiro

doi:10.1111/j.1440-1835.2001.tb00261.x

Cited by 33 publications

(17 citation statements)

References 19 publications

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“…The increasing trend of dark respiration with higher temperatures observed in this study is consistent with data reported for freshwater macroalgae (Libbert and Walter, 1985;Necchi and Zucchi, 2001;Necchi, 2004a) and higher plants (Atkin and Tjoelker, 2003). This trend suggests a decreasing balance between net primary production and temperature, representing more critical conditions towards higher temperatures for most species.…”

Section: Photosynthetyc Parameterssupporting

confidence: 91%

Photosynthetic characteristics of a tropical population of Nitella cernua (Characeae, Chlorophyta)

Vieira

Necchi

2006

Braz. J. Plant Physiol.

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Photosynthetic characteristics (assessed by chlorophyll fluorescence and O 2 evolution) were analysed monthly during one year in a tropical population of Nitella cernua from southeastern Brazil (20 o 50 32" S, 49 o 26 15" W). Parameters derived from photosynthesis-irradiance (PI) curves by fluorescence (high values of the photosynthetic parameter, I k , and lack or low values of photoinhibition, β) suggested adaptation to high irradiance, whereas those by O 2 evolution showed a different pattern (low values of I k and compensation irradiance, I c , high values of photosynthetic efficiency, α, and photoinhibition). Parameters from PI curves by O 2 evolution suggested light acclimation: I k and maximum photosynthetic rate, P max (as rETR, relative electron transfer rate) increased, whereas α became significantly lower under higher irradiance (winter). This pattern is an adjustment of both number and size of photosynthetic units. Photosynthetic performance assessed by fluorescence revealed two seasonal periods: higher values of P max (rETR), I k and nonphotochemical quenching from October to March (rainy season), and lower values from April to October (dry season). Temperature responses were observed only in summer, but temperature optima were different between methods: peaks of net photosynthesis occurred at 20 o C, whereas rETR increased towards higher temperatures (up to 30 o C). Dark respiration increased with higher temperatures. Current velocity had a stimulatory effect on photosynthetic rates, as suggested by positive correlations with P max (rETR) and α. pH experiments revealed highest net photosynthetic rates under pH 4.0, suggesting higher affinity for CO 2 than HCO 3 -. This broad range of responses of photosynthetic characteristics of this N. cernua population to irradiance, temperature, and pH/inorganic carbon reflects a wide tolerance to variations in these environmental variables, which probably contribute to the wide distribution of this species. Key words: charophytes, irradiance, Nitella, pH, photosynthesis, seasonal dynamics, temperature Características fotossintéticas de uma população tropical de Nitella cernua (Characeae, Chlorophyta): Foram analisadas mensalmente, durante um ano, as características fotossintéticas (por meio de fluorescência da clorofila e evolução de O 2 ) de uma população tropical de Nitella cernua do sudeste do Brasil (20 o 50 32" S, 49 o 26 15" W). Parâmetros derivados das curvas fotossíntese-irradiância (FI) por fluorescência (alto valor do parâmetro de saturação de luz, I k , e ausência ou baixa fotoinibição, β) sugeriram adaptação a alta irradiância, enquanto aqueles por evolução de oxigênio mostraram adaptações à sombra (baixo valores de I k e de irradiância de compensação, I c , altos valores de eficiência fotossintética, α, e β). Parâmetros das curvas FI por oxigênio sugeriram aclimatação à luz: I k e taxa fotossintética máxima, F max (analisada como rETR, taxa relativa de transporte de elétrons) aumentaram e α foi significativamente menor sob irradiância mais alta (i...

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Section: Photosynthetyc Parameterssupporting

confidence: 91%

Photosynthetic characteristics of a tropical population of Nitella cernua (Characeae, Chlorophyta)

Vieira

Necchi

2006

Braz. J. Plant Physiol.

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“…The light regime, understood as a range of fluctuations, intensity, quality, and photoperiod, affect the seasonality of freshwater red algae (SHeatH & burkHolder 1985). Like many red algae, H. rivularis is often found in shaded habitats / microhabitats, being adapted to survive in low-light (bourrelly 1955;StarMaCH 1969;roS et al 1997), and showing a preference for low-light regimes (kreMer 1983;Sabater et al 1989;SHeatH & HaMbrook 1990;leukart & Hanelt 1995;neCCHi & ZuCCHi 2001;eloranta & kwandranS 2004;Cantonati et al 2012b;CeSCHin et al 2013). Our study showed that when shading is too high, Chl-a values were lower than those measured in the presence of more abundant light.…”

Section: Discussionmentioning

confidence: 99%

“…Many environmental variables (physical and chemical factors) affect the growth of epilithic algae: light (e.g., Hill et al 1995;neCCHi & ZuCCHi 2001), temperature (neCCHi & ZuCCHi 2001), substrate composition and grain size (blinn et al 1980), pH (MauriCe et al 1987), nutrients (elwood et al 1981), and current speed and disturbance (peterSon & StevenSon 1992).…”

Section: Introductionmentioning

confidence: 99%

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Exploring the contrasting seasonal strategies of two crenic macroalgae

Cantonati¹,

Spitale²,

Scalfi³

et al. 2016

Fottea

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Most studies on springs assumed stability, and reduced seasonal changes in the biota. We focused on two macroalgae (the rhodophyte Hildenbrandia rivularis and the chrysophyte Hydrurus foetidus) to unveil their seasonal-development patterns in springs. H. rivularis cover remained virtually constant throughout the year, although seasonal fluctuations in ecophysiological parameters were detected. The most important determinant of seasonal changes in H. rivularis was shown to be the complex interplay between solar radiation (day length) and shading. Negative cross-correlation between Chl-a and shading was found to be significant but with a time lag. H. foetidus seasonal changes were evident both at the macroscopic level and in ecophysiological parameters. Interestingly, it occurred throughout the year in the spring whilst it completely disappeared in summer in a nearby glacial stream. Unexpectedly, variability of ecophysiological parameters (coefficients of variation) was shown to be 15-20% higher in H. rivularis than in H. foetidus.

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“…No presente estudo, foi observado maior abundância de cianobactérias no tratamento com comprimentos de ondas mais longos (600 a 700 nm), ou seja, na faixa em que ocorre maior absorbância em ficocianinas e aloficianinas. De fato, Diakoff & Scheibe (1973) para Tolipotrix tenuis e Haury & Bogorad (1977) e Vogelman & Scheibe (1978) (Leukart & Hanelt, 1995;Necchi & Zucchi, 2001;Necchi, 2004 Para a composição espectral, por sua vez, a resposta deste grupo foi similar àquela encontrada para as cianobactérias, ou seja, maior biomassa no tratamento vermelho. A divisão Rhodophyta apresenta complexo pigmentar semelhante aos das algas azuis com a presença de ficobiliproteínas, porém, dentro de cloroplastos (Lee, 2008).…”

Section: ) Discussãounclassified

Efeitos da irradiância e da composição espectral da luz sobre o estabelecimento e desenvolvimento de comunidades de macroalgas lóticas em substratos artificiais

Tonetto¹

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Photosynthetic performance of freshwater Rhodophyta in response to temperature, irradiance, pH and diurnal rhythm

Cited by 33 publications

References 19 publications

Photosynthetic characteristics of a tropical population of Nitella cernua (Characeae, Chlorophyta)

Photosynthetic characteristics of a tropical population of Nitella cernua (Characeae, Chlorophyta)

Exploring the contrasting seasonal strategies of two crenic macroalgae

Efeitos da irradiância e da composição espectral da luz sobre o estabelecimento e desenvolvimento de comunidades de macroalgas lóticas em substratos artificiais

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