Differences in photosynthetic performance between cyanobacterial and green algal components of lichen photosymbiodemes measured in the field

Green, T. G. A.; Büdel, Burkhard; Heber, U.; Meyer, A.; Zellner, H.; Lange, O. L.

doi:10.1111/j.1469-8137.1993.tb03921.x

Cited by 41 publications

(40 citation statements)

References 15 publications

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“…paring the ecophysiological performances of cyanobacterial and green algal photobionts under almost identical conditions (Green et al, 1993). We have previously analysed the genetic diversity of cyanobacterial strains in lichens and cycads (Costa et al, 1999) based on the tRNA Leu (UAA) intron.…”

Section: Figmentioning

confidence: 99%

Spatial patterns of photobiont diversity in some Nostoc‐containing lichens

2000

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Patterns of photobiont diversity were examined in some Nostoc-containing lichens using the nucleotide sequence of the cyanobacterial tRNA Leu (UAA) intron. Lichen specimens collected in northwestern USA were analysed and the sequence data were compared with tRNA Leu (UAA) intron sequences previously obtained from lichens in northern Europe. Generally, it is the species identity of a lichen rather than the geographical origin of the specimen that determines the identity of the cyanobiont. Identical intron sequences were found in Peltigera membranacea specimens collected in Oregon (USA) and in Sweden, and very similar sequences were also found in Nephroma resupinatum thalli collected in Oregon and Finland. Furthermore, in mixed assemblages where two Peltigera species grew in physical contact with each other, the different lichen species housed different photobiont strains. There is however not a one-to-one relation between mycobiont and photobiont as some intron sequences were found in more than one lichen species, and different intron sequences were found in different samples of some lichen taxa. Peltigera venosa exhibited a higher level of photobiont diversity than any other lichen species studied, and several intron sequences could for the first time be obtained from a single thallus. It is not clear whether this is evidence of lower cyanobiont specificity, or reflects an ability to exhibit different degrees of lichenization with different Nostoc strains. In one specimen of P. venosa, which contained bipartite cyanosymbiodemes and tripartite, cephalodiate thalli, both thallus types contained the same intron sequence.

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Section: Figmentioning

confidence: 99%

Spatial patterns of photobiont diversity in some Nostoc‐containing lichens

2000

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“…Despite their importance only a few studies are interested in the ecophysiology of cyanobacterial crust communities of the tropical and subtropical inselberg rock surfaces [7,9,19,21,[26][27][28] and seasonally inundated system of plans and dunes [29,30]. Most studies deal with the photosynthesis of the cryptogamic crusts under laboratory conditions [29] while only few characterize the photosynthesis of free-living cyanobacteria under natural conditions in the tropical field [7,21,28,31] and desert [11,13,30]. In addition, as BSCs dry out more slowly due to their embedment to the rock or soil surfaces (under their natural habitats) and therefore may retain water longer than lichens and mosses.…”

Section: Introductionmentioning

confidence: 99%

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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“…All had a dark upper side in order to collect the sparse light. In all three Sticta species, the photobionts are cyanobacteria which have lower light saturation and light compensation points for photosynthesis compared to those of green algae in sun-adapted lichens (Green et al 1993). Leptogium (L. cf.…”

Section: Example For a Deep Shade Locationmentioning

confidence: 99%

Vitality of lichens under different light climates in an Araucaria forest (Pró-Mata RS, South Brazil) as determined by chlorophyll fluorescence

et al. 2018

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Th e vitality of 64 lichen species (107 individual lichen thalli) growing under diff erent light climates in an Araucaria forest in South Brazil was analyzed by chlorophyll fl uorescence. Study sites were grouped according to their local light availability under full sunlight (about 2200 µmol m -2 s -1 ): 1 = low light, up to 20 µmol m -2 s -1 ; 2 = medium light, 20 to 100 µmol m -2 s -1 ; and 3 = high light, more than 100 µmol m -2 s -1 . Maximum quantum yield of photosystem II, as shown by F v /F m of dark-adapted samples, was mainly between 0.3 and 0.7, with extremes of below 0.1 and up to 0.85. On average, yields were highest with low light availability (0.66). Groups 1 and 2 were not signifi cantly diff erent from each other, but groups 1 and 3, as well as groups 2 and 3 were. After dark adaptation, lichens were exposed to diff erent light intensities by means of a chlorophyll fl uorometer. Th e results show that low light-adapted lichens exhibit the highest sensitivity to excess light, as was also indicated by the data for non-photochemical quenching. Th us, shade-adapted lichens are obviously well protected from possible damage caused by excess light, which is important when exposed to sun fl ecks.

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Differences in photosynthetic performance between cyanobacterial and green algal components of lichen photosymbiodemes measured in the field

Cited by 41 publications

References 15 publications

Spatial patterns of photobiont diversity in some Nostoc‐containing lichens

Spatial patterns of photobiont diversity in some Nostoc‐containing lichens

Ecophysiological responses of desiccation-tolerant cryptobiotic crusts

Vitality of lichens under different light climates in an Araucaria forest (Pró-Mata RS, South Brazil) as determined by chlorophyll fluorescence

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