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A short-term (one-hour) irradiation stress was applied to metabolically active thalli and parameters related to photosynthesis at various recovery periods after treatment was examined through complementary in vivo chlorophyll fluorescence techniques (OJIP transients and quenching analysis), 77\u00a0K fluorescence emission spectra and assimilation pigment measurements. In both species, considerable but reversible photoinhibition of photosystem II was observed following sunlight and VIS radiation exposure, as evidenced by a significant decrease in F\n                    <jats:sub>V<\/jats:sub>\n                    \/F\n                    <jats:sub>M<\/jats:sub>\n                    and increased K and J steps of the OJIP curves; albeit photodamage resulting from sunlight was more pronounced. Although UV-A1 had negligible inhibitory effect, it stimulated pigment synthesis in\n                    <jats:italic>C. aculeata<\/jats:italic>\n                    and enhanced photochemical energy utilization in\n                    <jats:italic>C. uncialis<\/jats:italic>\n                    . The two species revealed different strategies to cope with excess light energy; namely,\n                    <jats:italic>C. aculeata<\/jats:italic>\n                    relied on enhanced non-photochemical quenching (NPQ) and redistribution of excitation energy toward PSI, whereas\n                    <jats:italic>C. uncialis<\/jats:italic>\n                    preserved a more efficient donor site of PSII (higher F\n                    <jats:sub>V<\/jats:sub>\n                    \/F\n                    <jats:sub>0<\/jats:sub>\n                    ). Overall, VIS radiation was identified as the primary factor impairing PSII, posing a substantially greater threat than UV-A1. These findings might be relevant for understanding lichen performance under variable and atypical weather events, such as sunshowers or scattered showers with sunny spells.\n                  <\/jats:p>","DOI":"10.1007\/s11120-026-01242-0","type":"journal-article","created":{"date-parts":[[2026,10,20]],"date-time":"2026-10-20T17:16:45Z","timestamp":1792516605000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Photosynthetic performance of photobionts under intense visible and UV-A radiation in lichens with light-absorbing or light-reflecting fungal pigments"],"prefix":"10.1007","volume":"164","author":[{"given":"Piotr","family":"Osyczka","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Natalia","family":"Kami\u0144ska","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3361-7934","authenticated-orcid":false,"given":"Beata","family":"My\u015bliwa-Kurdziel","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2026,10,20]]},"reference":[{"issue":"03","key":"1242_CR1","doi-asserted-by":"publisher","first-page":"153","DOI":"10.1016\/S1011","volume":"70","author":"A Andreeva","year":"2003","unstructured":"Andreeva A, Stoitchkova K, Busheva M, Apostolova E (2003) Changes in the energy distribution between chlorophyll \u2013 protein complexes of thylakoid membranes from pea mutants with modified pigment content I. 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