Growth of Chara Hispida: II. Shade Adaptation

Andrews, Mitchell; Box, Rainer Joachim; McInroy, Shona G.; Raven, John A.

doi:10.2307/2259538

Cited by 39 publications

(26 citation statements)

References 6 publications

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“…These results agree with previous studies in shallow waters (e.g. Steinman et al, 1997;Küster et al, 2000) but contrast studies of other habitats where charophytes revealed adaptations to low irradiances (Andrews et al, 1984;Menendez and Sanchez, 1998;. On the other hand, results by O 2 evolution showed a trend toward adaptations to shade conditions as indicated by the relatively low values of I k and I c , high values of α and occurrence of photoinhibition.…”

Section: Photosynthetyc Parameterssupporting

confidence: 91%

“…Parameters derived from the PI curves (relatively low I c and I k , and occurrence of photoinhibition) suggested adaptation to low irradiance for some charophyte species (Andrews et al, 1984;Menendez and Sanchez, 1998;, whereas some investigations (Steinman et al, 1997;Küster et al, 2000) clearly indicated preferences for high irradiances in other species. Photoinhibition has been rarely reported in Characeae (Menendez and Sanchez, 1998;.…”

Section: Introductionmentioning

confidence: 98%

“…Photoinhibition has been rarely reported in Characeae (Menendez and Sanchez, 1998;. However, irradiances applied in some PI curves (e.g., 60-110 µmol m -2 s -1 , Andrews et al, 1984;Schwarz et al, 1996) were not high enough to detect photoinhibition. On the other hand, some charophyte species do not grow under shade conditions (Moore, 1986) and photoinhibition has not been observed under irradiances as high as 1,600 µmol m -2 s -1 in species adapted to high-light conditions (Küster et al, 2000).…”

Section: Introductionmentioning

confidence: 99%

“…It is part of a wider study, which also included phenology and coexistence with another macrophyte (Egeria najas Planchon) in a shallow habitat. The hypotheses tested in this study were: 1) this population of N. cernua is expected to have a well-defined seasonal pattern in photosynthetic characteristics, as a response to predictable changes in environmental variables (temperature and irradiance); 2) the alga will exhibit some characteristics of shade-adapted plants, based on previous results for other charophyte species (Andrews et al, 1984;, as well as preference for free CO 2 as inorganic carbon form for photosynthesis (Raven, 1997;.…”

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confidence: 99%

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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%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

See 2 more Smart Citations

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

Vieira

Necchi

2006

Braz. J. Plant Physiol.

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“…Only minor attention, so far, was paid to the pigments of stoneworts (Seybold et al 1941, Andrews et al 1984, Czeczuga 1986, Howard-Williams et al 1995, Schagerl & Pichler 2000. With the exception of Schagerl & Pichler (2000), who studied pigments by means of HPLC, chl-s and carotenoids have been detected spectrophotometrically in total fraction quality only.…”

Section: Charalesmentioning

confidence: 99%