Utilization of inorganic carbon in the edible cyanobacterium Ge‐Xian‐Mi (Nostoc) and its role in alleviating photo‐inhibition

Qiu, Bao Sheng; Liu, J. Y.

doi:10.1111/j.1365-3040.2004.01248.x

Cited by 29 publications

(24 citation statements)

References 64 publications

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“…Lower NPQ might also be attributed to the down-regulation of CCM which functions to concentrate intracellular CO 2 and subsequently acidify the thylakoid lumen (Raven, 1997). However, operation of the CCM can play a role in draining the electrons and lead to reduced photoinhibition (Qiu and Liu, 2004). The down-regulated CCM of P. tricornutum grown at high CO 2 could be associated with weakened cyclic electron transport (Moroney and Somanchi, 1999) that can also lead to higher photo-inhibition (Takahashi et al, 2009).…”

Section: Discussionmentioning

confidence: 99%

CO2-induced seawater acidification affects physiological performance of the marine diatom Phaeodactylum tricornutum

2010

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Abstract. CO 2 /pH perturbation experiments were carried out under two different pCO 2 levels (39.3 and 101.3 Pa) to evaluate effects of CO 2 -induced ocean acidification on the marine diatom Phaeodactylum tricornutum. After acclimation (>20 generations) to ambient and elevated CO 2 conditions (with corresponding pH values of 8.15 and 7.80, respectively), growth and photosynthetic carbon fixation rates of high CO 2 grown cells were enhanced by 5% and 12%, respectively, and dark respiration stimulated by 34% compared to cells grown at ambient CO 2 . The half saturation constant (K m ) for carbon fixation (dissolved inorganic carbon, DIC) increased by 20% under the low pH and high CO 2 condition, reflecting a decreased affinity for HCO − 3 or/and CO 2 and down-regulated carbon concentrating mechanism (CCM). In the high CO 2 grown cells, the electron transport rate from photosystem II (PSII) was photoinhibited to a greater extent at high levels of photosynthetically active radiation, while non-photochemical quenching was reduced compared to low CO 2 grown cells. This was probably due to the down-regulation of CCM, which serves as a sink for excessive energy. The balance between these positive and negative effects on diatom productivity will be a key factor in determining the net effect of rising atmospheric CO 2 on ocean primary production.

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Section: Discussionmentioning

confidence: 99%

CO2-induced seawater acidification affects physiological performance of the marine diatom Phaeodactylum tricornutum

2010

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“…Our previous study found that M. aeruginosa cells exposed to long-term UV-B radiation show a lower K ½ CO 2 compared to untreated samples (Song & Qiu, 2007). Other studies have examined the CCM of cyanobacteria under LC i , and it has been proposed that the CCM makes cyanobacteria more competitive during bloom formation (Qiu & Liu, 2004;Riding, 2006;Cheng et al, 2008); as yet, however, there is no experimental evidence for this.…”

Section: Introductionmentioning

confidence: 81%

“…Under LC i conditions, cyanobacteria show greater expression of their CCM-related components (Omata et al, 1999;Price et al, 2008). Qiu & Liu (2004) demonstrated that the operation of the CCM in cyanobacterium Nostoc served as a means of diminishing photodynamic damage by dissipating excess light energy. Furthermore, it has been found that high DIC constrains high light acclimation of the cyanobacterium Synechococcus (Burns et al, 2006).…”

mentioning

confidence: 99%

Effects of dissolved inorganic carbon on competition of the bloom-forming cyanobacteriumMicrocystis aeruginosawith the green algaChlamydomonas microsphaera

Zhang

Jiang

Liu

et al. 2012

European Journal of Phycology

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The availability of dissolved inorganic carbon (DIC) may have a considerable impact on species competition in phytoplankton communities. The growth, photosynthetic characteristics and competition of three strains, the toxic Microcystis aeruginosa FACHB 912, nontoxic M. aeruginosa FACHB 469 and Chlamydomonas microsphaera FACHB 52, were investigated under two different DIC concentrations (0.365 and 7.658 mmol l À1 KHCO 3 ). In monoculture, DIC concentration did not affect the specific growth rates of any of the three strains. However, when grown in mixed culture with C. microsphaera, both toxic and nontoxic Microcystis strains showed increased percentages under low DIC concentration but decreased percentages under high DIC concentration. After 12 days' mixed culture, the percentage of M. aeruginosa FACHB 912 or FACHB 469 decreased by 9À22% in high DIC medium, but increased by 6-11% in low DIC medium. Low DIC concentration decreased the cell size, cellular chlorophyll fluorescence and photosynthetic capacity of C. microsphaera, but it had little effect on those of M. aeruginosa FACHB 912 and FACHB 469. The apparent photosynthetic affinities for DIC were significantly higher in the two M. aeruginosa strains than in C. microsphaera. From the higher DIC affinity, more efficient photosynthetic capacity and increased percentages in competition experiments under low DIC concentration, it can be concluded that the bloom-forming M. aeruginosa possesses a competitive advantage in DIC-limited conditions.

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“…Two direct HCO3 2 uptake systems are proposed in cyanobacteria (Kaplan and Reinhold, 1999;Giordano et al, 2005): an ATP-binding cassette-type transporter with a high affinity for HCO3 2 (Bonfil et al, 1998;Ohkawa et al, 1998;Omata et al, 1999) and a Na 1 -dependent transporter (Miller et al, 1984;Kandasamy, 1992, 1994;Gao and Zou, 2001;Qiu and Liu, 2004). Many eukaryotic photosynthetic organisms, both freshwater and marine, are capable of direct utilization of HCO3 2 from the medium (Rotatore et al, 1995;Amoroso et al, 1998;Matsuda et al, 2001;Colman et al, 2002).…”

Section: Indirect Hco3mentioning

confidence: 99%

Evidence for K+-Dependent HCO3− Utilization in the Marine Diatom Phaeodactylum tricornutum

2006

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Photosynthetic utilization of inorganic carbon in the marine diatom Phaeodactylum tricornutum was investigated by the pH drift experiment, measurement of K1/2 values of dissolved inorganic carbon (DIC) with pH change, and comparison of the rate of photosynthesis with the rate of the theoretical CO2 formation from uncatalyzed HCO3 2 conversion in the medium. The higher pH compensation point (10.3) and insensitivity of the photosynthetic rate to acetazolamide indicate that the alga has good capacity for direct HCO3 2 utilization. The photosynthetic rate reached 150 times the theoretical CO2 supply rate at 100 mmol L 21 DIC (pH 9.0) in the presence of 10 mmol L 21 K 1 and 46 times that in the absence of K 1 , indicating that for pH 9.4-grown P. tricornutum, HCO32 in the medium is taken up through K 1 -dependent and -independent HCO3 2 transporters. The K1/2 (CO2) values at pH 8.2 were about 4 times higher than those at pH 9.0, whereas the K1/2 (HCO32 ) values at pH 8.2 were slightly lower than those at pH 9.0 whether without or with K In natural seawater, CO2 usually accounts for less than 1% of total dissolved inorganic carbon (DIC) and the predominant form of DIC is HCO3 2. The CO2 concentration is lower than that required for the half-maximal photosynthetic rate, so photosynthesis would be limited by the diffusive entry of CO2 if photosynthetic organisms depended entirely on ambient dissolved CO2 for photosynthesis. To maintain efficient photosynthesis, many phytoplankton species have developed CO2-concentrating mechanisms; how to take up DIC across the cellular membranes from the environment is an important part of the CO2-concentrating mechanisms (Raven and Falkowski, 1999;Giordano et al., 2005).The characterization of the DIC species utilized from the medium by various phytoplankton has been extensively studied. Most organisms examined to date can use CO2 or HCO3 2 or both, but species-specific preferences are observed (Kaplan et al

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Utilization of inorganic carbon in the edible cyanobacterium Ge‐Xian‐Mi (Nostoc) and its role in alleviating photo‐inhibition

Cited by 29 publications

References 64 publications

CO<sub>2</sub>-induced seawater acidification affects physiological performance of the marine diatom <i>Phaeodactylum tricornutum</i>

CO<sub>2</sub>-induced seawater acidification affects physiological performance of the marine diatom <i>Phaeodactylum tricornutum</i>

Effects of dissolved inorganic carbon on competition of the bloom-forming cyanobacteriumMicrocystis aeruginosawith the green algaChlamydomonas microsphaera

Evidence for K+-Dependent HCO3− Utilization in the Marine Diatom Phaeodactylum tricornutum

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Utilization of inorganic carbon in the edible cyanobacterium Ge‐Xian‐Mi (Nostoc) and its role in alleviating photo‐inhibition

Cited by 29 publications

References 64 publications

CO&lt;sub&gt;2&lt;/sub&gt;-induced seawater acidification affects physiological performance of the marine diatom &lt;i&gt;Phaeodactylum tricornutum&lt;/i&gt;

CO&lt;sub&gt;2&lt;/sub&gt;-induced seawater acidification affects physiological performance of the marine diatom &lt;i&gt;Phaeodactylum tricornutum&lt;/i&gt;

Effects of dissolved inorganic carbon on competition of the bloom-forming cyanobacteriumMicrocystis aeruginosawith the green algaChlamydomonas microsphaera

Evidence for K+-Dependent HCO3− Utilization in the Marine Diatom Phaeodactylum tricornutum

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CO<sub>2</sub>-induced seawater acidification affects physiological performance of the marine diatom <i>Phaeodactylum tricornutum</i>

CO<sub>2</sub>-induced seawater acidification affects physiological performance of the marine diatom <i>Phaeodactylum tricornutum</i>