Predicting CO2 gain and photosynthetic light acclimation from fluorescence yield and quenching in cyano-lichens

Sundberg, Bodil; Campbell, Douglas A.; Palmqvist, Kristin

doi:10.1007/bf01007698

Cited by 60 publications

(55 citation statements)

References 30 publications

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“…Moreover, our results demonstrate that the influence of non-assimilatory electron flow at high irradiances on the relationship between fluorescence and respirometry assays of photosynthesis may represent a general trend for photosynthetic organisms. We find that for corals, oxygen evolution saturates prior to rETR, as has been shown for cyano-lichens, macroalgae and higher plants (Sundberg et al 1997, Fryer et al 1998, Figueroa et al 2003. This indicates that once the assimilatory reactions of photosynthesis become saturated, electrons may still be transported through PSII.…”

Section: Discussionsupporting

confidence: 56%

Energetic cost of photoinhibition in corals

Hoogenboom¹,

Anthony²,

Connolly³

2006

Mar. Ecol. Prog. Ser.

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Section: Discussionsupporting

confidence: 56%

Energetic cost of photoinhibition in corals

Hoogenboom¹,

Anthony²,

Connolly³

2006

Mar. Ecol. Prog. Ser.

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“…Many studies observed similar results for cyanobacteria that reflect a steady-state condition of photochemistry [21,48]. The relatively high qP, even at high light intensities, is related to the ability of cyanobacteria to remove electrons from PSII and maintain the centres open [21,49]. This provides an expressive index of the balance between excitation of PSII and the electron transport chain and reflects a complex and flexible electron transport system, as well as a generally high PSI/PSII ratio [50].…”

Section: Chlorophyll-a Fluorescence Responsesmentioning

confidence: 57%

Ecophysiological responses of desiccation-tolerant cryptobiotic crusts

et al. 2011

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In our present studies, the recovery of photosynthetic activity after rehydration was demonstrated. We measured chlorophyll fluorescence, CO2 gas exchange and the pigment composition in the previously long-term air-dried cryptogamic inselberg crusts collected from two tropical areas. The cryptobiotic crusts were collected from different localities on similar ecological and climatic conditions from extreme habitats of inselbergs (outcrops). These inselbergs are characterized by a dry microclimate and are covered by scarce soil. We found that the ecophysiological responses of both cryptogamic inselberg crusts showed an extremely high degree of desiccation-tolerance due to the fast and full recovery during rehydration. The photosynthetic activity of the cryptobiotic crusts were restored and regained within 15 and 40 min, respectively, after rehydration. Photosynthetic activity of the crusts was retained at all applied light intensities when enough water was available, however the degree of the recovery was different between the crusts. Photosynthetic pigment contents were strongly and positively correlated with water content. Our results indicated that tropical desiccation-tolerant cryptogamic crusts found on inselberg rock surfaces have CO2 fixation ability in the range of cyanobacteria and lichens, suggesting that at a global scale they can assimilate CO2 in a significant amount.

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“…So far, these parameters have been extensively investigated only for Coccomyxa, which again behaved similarly to C $ plant cells (O $ gren, 1993 ;Palmqvist et al, 1994b). Data are incomplete for Nostoc (Sundberg et al, 1997a) and lacking for other major photobiont taxa. However, light-response curves obtained from three Nostoc-Peltigera associations and the tripartite species Peltigera leucophlebia (CoccomyxajNostoc) indicated that the light environment of their respective collection sites could be equally important as the presence of a CCM in determining φ and θ (Smith & Griffiths, 1998b).…”

Section: Light and Nitrogen Relationsmentioning

confidence: 99%

Tansley Review No. 117

Palmqvist

2000

New Phytologist

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218

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Lichens are nutritionally specialized fungi (the mycobiont component) that derive carbon and in some cases nitrogen from algal or cyanobacterial photobionts. The mycobiont and photobiont live together in an integrated thallus, but they lack specific tissue for the transport of metabolites and resources between them. Carbon is acquired through photosynthesis in the photobiont, which is active when the lichen is wet and exposed to light. Lichen photosynthesis is limited primarily by water, light and nitrogen, but can also be constrained by slow diffusion of CO # within the wet thallus. The assimilated carbon is exported from photobiont to mycobiont, which also predominates in terms of biomass, and apparently regulates the size of the photobiont population. It has therefore generally been assumed that most of the carbon is used for growth and maintenance of the fungal hyphae. However, the extent of photobiont respiration in relation to mycobiont respiration has seldom been quantified ; neither do we know the pool sizes of various carbon sinks within lichens. Owing to this lack of fundamental data we do not know whether, or how, carbohydrate resources are regulated to maintain an optimal balance between energy input and expenditures in these symbiotic organisms. This review summarizes data on growth, carbon gain and carbon expenditures in lichens, with particular emphasis on factors determining the photosynthetic capacity of their photobionts. An attempt is made to introduce an economic analysis of lichen growth processes, a view that has often been adopted in studies of higher plants. Areas in which more data are needed for the construction of a model on ' lichen resource allocation patterns ' are discussed.

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Predicting CO2 gain and photosynthetic light acclimation from fluorescence yield and quenching in cyano-lichens

Cited by 60 publications

References 30 publications

Energetic cost of photoinhibition in corals

Energetic cost of photoinhibition in corals

Ecophysiological responses of desiccation-tolerant cryptobiotic crusts

Tansley Review No. 117

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