Advances in Understanding of Desiccation Tolerance of Lichens and Lichen-Forming Algae
| Autor: | Leonardo M. Casano, Eva M. del Campo, Francisco Gasulla, Alfredo Guéra |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
0106 biological sciences
0301 basic medicine Cyanobacteria desiccation tolerance Review Plant Science lichen 01 natural sciences Desiccation tolerance Cell wall 03 medical and health sciences chemistry.chemical_compound Algae Botany Lichen skin and connective tissue diseases Ecology Evolution Behavior and Systematics Ecology biology stress response biology.organism_classification 030104 developmental biology chemistry QK1-989 poikilohydric phycobionts Green algae Desiccation 010606 plant biology & botany Violaxanthin |
| Zdroj: | Plants, Vol 10, Iss 807, p 807 (2021) Plants |
| ISSN: | 2223-7747 |
| Popis: | Lichens are symbiotic associations (holobionts) established between fungi (mycobionts) and certain groups of cyanobacteria or unicellular green algae (photobionts). This symbiotic association has been essential in the colonization of terrestrial dry habitats. Lichens possess key mechanisms involved in desiccation tolerance (DT) that are constitutively present such as high amounts of polyols, LEA proteins, HSPs, a powerful antioxidant system, thylakoidal oligogalactolipids, etc. This strategy allows them to be always ready to survive drastic changes in their water content. However, several studies indicate that at least some protective mechanisms require a minimal time to be induced, such as the induction of the antioxidant system, the activation of non-photochemical quenching including the de-epoxidation of violaxanthin to zeaxanthin, lipid membrane remodeling, changes in the proportions of polyols, ultrastructural changes, marked polysaccharide remodeling of the cell wall, etc. Although DT in lichens is achieved mainly through constitutive mechanisms, the induction of protection mechanisms might allow them to face desiccation stress in a better condition. The proportion and relevance of constitutive and inducible DT mechanisms seem to be related to the ecology at which lichens are adapted to. |
| Databáze: | OpenAIRE |
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