期刊
LICHENOLOGIST
卷 53, 期 1, 页码 21-33出版社
CAMBRIDGE UNIV PRESS
DOI: 10.1017/S0024282920000535
关键词
ascorbate glutathione pathway; high light stress; non-photochemical quenching; PSII repair cycle; secondary metabolites
资金
- Russian Government Program of Competitive Growth of Kazan Federal University
- Russian Science Foundation [18-14-00198]
- Russian government assignment of FRC Kazan Scientific Center of RAS
- NRF
- OeAD [ZA 14/2019]
- Russian Science Foundation [18-14-00198] Funding Source: Russian Science Foundation
Lichens often grow in harsh microhabitats, facing abiotic stresses like desiccation, temperature extremes, and excessive light levels. They can tolerate high light by reducing ROS formation, scavenging ROS, or repairing ROS-induced damage.
Lichens often grow in microhabitats where they are exposed to severe abiotic stresses such as desiccation and temperature extremes. They are also often exposed to levels of light that are greater than lichen photobionts can use in carbon fixation. Unless regulated, excess energy absorbed by the photobionts can convert ground state oxygen to reactive oxygen species (ROS). These ROS can attack the photosynthetic apparatus, causing photoinhibition and photo-oxidative stress, reducing the ability of the photobionts to fix carbon. Here, we outline our current understanding of the effects of high light on lichens and the mechanisms they use to mitigate or tolerate this stress in hydrated and desiccated states. 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. While the primary focus of this review is tolerance to high light in lichen photobionts, our knowledge is rather fragmentary, and therefore we also include recent findings in free-living relatives to stimulate new lines of research in the study of high light tolerance in lichens.
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