Accounting for photosystem I photoinhibition sheds new light on seasonal acclimation strategies of boreal conifers.

ABSTRACT: The photosynthetic acclimation of boreal evergreen conifers is controlled by regulatory and photoprotective mechanisms that allow conifers to cope with extreme environmental changes. However, the underlying dynamics of photosystem II (PSII) and photosystem I (PSI) remain unresolved. Here, we investigated the dynamics of PSII and PSI during the spring recovery of photosynthesis in Pinus sylvestris and Picea abies using a combination of chlorophyll a fluorescence, P700 difference absorbance measurements, and quantification of key thylakoid protein abundances. In particular, we derived a new set of PSI quantum yield equations, correcting for the effects of PSI photoinhibition. Using the corrected equations, we found that the seasonal dynamics of PSII and PSI photochemical yields remained larg

SUBMITTER: Grebe S 

PROVIDER: S-EPMC11233416 | biostudies-literature | 2024 Jul

REPOSITORIES: biostudies-literature