Unpigmented lichen substances protect lichens against photoinhibition of photosystem II in both the hydrated and desiccated states

@article{Ndhlovu2022UnpigmentedLS,
  title={Unpigmented lichen substances protect lichens against photoinhibition of photosystem II in both the hydrated and desiccated states},
  author={Nqobile Truelove Ndhlovu and Farida Minibayeva and Richard Peter Beckett},
  journal={Acta Physiologiae Plantarum},
  year={2022},
  volume={44},
  url={https://api.semanticscholar.org/CorpusID:252377609}
}
It is shown for the first time that, except for the atranorin-containing Heterodermia, lichen substances can also protect desiccated lichens and Interestingly, removal of substances has no effect on reflectance when lichens are dry, suggesting thatLichen substances protect photobionts in other ways.
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Background Citations
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Methods Citations
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Results Citations
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4 Citations

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41 References

Secondary Lichen Compounds as Protection Against Excess Solar Radiation and Herbivores

There is now solid support for the optimal defense theory in lichen–herbivore interactions, and Hypotheses on ecological functions can be tested because lichen compounds can nondestructively be extracted from air-dry lichens with 100% acetone.

Zn/Pb-tolerant lichens with higher content of secondary metabolites produce less phytochelatins than specimens living in unpolluted habitats

Tolerance to photoinhibition within lichen species is higher in melanised thalli

Melanised thalli were less photoinhibited than pale thalli in lichens from both high light and more shaded habitats, and those that possess either green-algal or cyanobacterial photobionts and are less sensitive to the adverse effects of high light.

Light screening in lichen cortices can be quantified by chlorophyll fluorescence techniques for both reflecting and absorbing pigments

Both atranorin and parietin play significant photoprotective roles for symbiotic green algae, but with compound-specific screening mechanisms.

Current Results on Biological Activities of Lichen Secondary Metabolites: a Review

Lichen secondary compounds have several possible biological roles, including photoprotection against intense radiation, as well as allelochemical, antiviral, antitumor, antibacterial, antiherbivore, and antioxidant action.

Photoprotection in lichens: adaptations of photobionts to high light

Tolerance to high light can be achieved first by lowering ROS formation, via synthesizing light screening pigments or by thermally dissipating the excess light energy absorbed; second, by scavenging ROS once formed; or third, by repairing ROS-induced damage.

Photobionts in Lichens: Possible Indicators of Phylogenetic Relationships?

A compilation of records of photobionts that are associated in lichens of the order Lecanorales shows that mycobionts, when seen at the levels of suborders, families, and genera, are strongly…

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Green-tree retention has been suggested as a means to effectively support epiphytic lichen species in managed forests, but, in GTR areas, lichen survival is high-irradiation limited and heavily dependent on phenotypic plasticity.

Photosynthetic activity of homoiochlorophyllous desiccation tolerant plant Haberlea rhodopensis during dehydration and rehydration

It could be suggested that unchanged chlorophyll content and amounts ofchlorophyll–proteins, reversible modifications in PSII electron transport and enhanced probability for non-radiative energy dissipation as well as increased polyphenolic synthesis during desiccation of Haberlea contribute to drought resistance and fast recovery after rehydration.

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