Accumulation of Monosaccharides in Lichen Mycobionts Cultured under Osmotic Conditions

Hamada, Nobuyuki; Okazaki, Kanako; Shinozaki, Masateru

doi:10.2307/3243757

Cited by 19 publications

(15 citation statements)

References 4 publications

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“…Further study on the interactions between sugars released to throughfall precipitation, and the response and stand-level distribution of green algal lichens would be a valuable line of inquiry. Although this was beyond the scope of the present study, the speculation by Hamada et al (1994) that green algal lichens have an increased tolerance to osmotic stress through the accumulation of exogenous glucose is intriguing in this respect.…”

Section: Discussionmentioning

confidence: 85%

Does exogenous carbon extend the realized niche of canopy lichens? Evidence from sub‐boreal forests in British Columbia

Campbell

Bengtson

Fredeen

et al. 2013

Ecology

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Foliose lichens with cyanobacterial bionts (bipartite and tripartite) form a distinct assemblage of epiphytes strongly associated with humid microclimatic conditions in inland British Columbia. Previous research showed that these cyano- and cephalolichen communities are disproportionately abundant and species-rich on conifer saplings beneath Populus compared to beneath other tree species. More revealing, lichens with cyanobacterial bionts were observed beneath Populus even in stands that did not otherwise support them. We experimentally test the hypothesis that this association is due to the interception of glucose-rich nectar that is exuded from Populus extra-floral nectaries (EFN). Using CO2 flux measurements and phospholipid fatty acid (PLFA) analysis with experimental applications of 13C6-labeled glucose, we demonstrate that cyano- and cephalolichens have a strong respiratory response to glucose. Lichens treated with glucose had lower net photosynthesis and higher establishment rates than control thalli. Furthermore, lichens with cyanobacterial bionts rapidly incorporate exogenous 13C into lichen fatty acid tissues. A large proportion of the 13C taken up by the lichens was incorporated into fungal biomarkers, suggesting that the mycobiont absorbed and assimilated the majority of applied 13C6 glucose. Our observations suggest that both cyanolichens and cephalolichens may utilize an exogenous source of glucose, made available by poplar EFNs. The exogenous C may enable these lichens to become established by providing a source of C for fungal respiration despite drought-induced inactivity of the cyanobacterial partner. As such, the mycobiont may adopt an alternative nutritional strategy, using available exogenous carbon to extend its realized niche.

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Section: Discussionmentioning

confidence: 85%

Does exogenous carbon extend the realized niche of canopy lichens? Evidence from sub‐boreal forests in British Columbia

Campbell

Bengtson

Fredeen

et al. 2013

Ecology

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“…This type of function suggests the presence of solid water soluble fraction dissolving in water with increasing hydration of the sample [32], which in lichen thalli consists of sugars and/or polyols [34]. The hydration dependence of "second" exponential component, L 2 /S, expressed in the units of solid, S, is presented in Fig.…”

Section: Resultsmentioning

confidence: 99%

Initial Phases of Antarctic Ramalina terebrata Hook f. & Taylor Thalli Rehydration Observed by Proton Relaxometry

et al. 2012

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Hydration kinetics, sorption isotherm, and proton free induction decays are measured for Ramalina terebrata thalli rehydrated from gaseous phase. Very tightly, tightly, and loosely bound water fractions are distinguished. Sorption isotherm is sigmoidal in form with the mass of water saturating primary water binding sites equal to ∆m/m 0 = 0.046. Proton free induction decays show the presence of immobilized water fraction (T * 2L 1 ≈ 100 µs) and mobile water pool (T * 2L 2 ≈ 330 µs). Sorption isotherm fitted to the NMR data shows the absence of water fraction "sealed" in pores of dry thallus.

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“…For hydration from gaseous phase of L. puberulum thalli the overall hydration level is not sufficient to dissolve the whole amount of water soluble solid (presumably carbohydrate) fraction, thus, the change in form of L/S hydration dependence was not observed. The accumulation of monosaccharides (as glucose, fructose, mannitol, and arabitol) in lichen mycobionts may be the adaptative feature for growing in dry conditions [27], however, the relatively high carbohydrate level is detected also in lichens populating wet habitats (e.g. 32 mg/g dry wt.…”

Section: Discussionmentioning

confidence: 99%

Deep Dehydration of Antarctic Lichen Leptogium puberulum Hue Observed by NMR and Sorption Isotherm

et al. 2009

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Hydration kinetics, sorption isotherm, and proton free induction decays are measured for Leptogium puberulum Hue thalli hydrated from gaseous phase. Very tightly, tightly and loosely bound water fraction are distinguished. The hydration dependence of mobile NMR signal component is non-linear and fitted well by rational function, which suggest the presence of water soluble solid (presumably carbohydrate) fraction in thallus structures of L. puberulum.

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Accumulation of Monosaccharides in Lichen Mycobionts Cultured under Osmotic Conditions

Cited by 19 publications

References 4 publications

Does exogenous carbon extend the realized niche of canopy lichens? Evidence from sub‐boreal forests in British Columbia

Does exogenous carbon extend the realized niche of canopy lichens? Evidence from sub‐boreal forests in British Columbia

Initial Phases of Antarctic Ramalina terebrata Hook f. & Taylor Thalli Rehydration Observed by Proton Relaxometry

Deep Dehydration of Antarctic Lichen Leptogium puberulum Hue Observed by NMR and Sorption Isotherm

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