Light-harvesting complex stress-related proteins play crucial roles in the acclimation of Physcomitrella patens under fluctuating light conditions.
Ecophysiology
Fluctuating light
LhcSR
Photoprotection
Physcomitrella patens
PsbS
Journal
Photosynthesis research
ISSN: 1573-5079
Titre abrégé: Photosynth Res
Pays: Netherlands
ID NLM: 100954728
Informations de publication
Date de publication:
Jan 2022
Jan 2022
Historique:
received:
14
05
2021
accepted:
24
08
2021
pubmed:
2
9
2021
medline:
1
2
2022
entrez:
1
9
2021
Statut:
ppublish
Résumé
Photosynthetic organisms have evolved photoprotective mechanisms to acclimate to light intensity fluctuations in their natural growth environments. Photosystem (PS) II subunit S (PsbS) and light-harvesting complex (LHC) stress-related proteins (LhcSR) are essential for triggering photoprotection in vascular plants and green algae, respectively. The activity of both proteins is strongly enhanced in the moss Physcomitrella patens under high-light conditions. However, their role in regulating photosynthesis acclimation in P. patens under fluctuating light (FL) conditions is still unknown. Here, we compare the responses of wild-type (WT) P. patens and mutants lacking PsbS (psbs KO) or LhcSR1 and 2 (lhcsr KO) to FL conditions in which the low-light phases were periodically interrupted with high-light pulses. lhcsr KO mutant showed a strong reduction in growth with respect to WT and psbs KO under FL conditions. The lack of LhcSR not only decreased the level of non-photochemical quenching, resulting in an over-reduced plastoquinone pool, but also significantly increased the PSI acceptor limitation values with respect to WT and psbs KO under FL conditions. Moreover, in lhcsr KO mutant, the abundance of PSI core and PSI-LHCI complex decreased greatly under FL conditions compared with the WT and psbs KO. We proposed that LhcSR in P. patens play a crucial role in moss acclimation to dynamic light changes.
Identifiants
pubmed: 34468919
doi: 10.1007/s11120-021-00874-8
pii: 10.1007/s11120-021-00874-8
doi:
Substances chimiques
Heat-Shock Proteins
0
Light-Harvesting Protein Complexes
0
Photosystem II Protein Complex
0
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
1-10Subventions
Organisme : Key Technology Research and Development Program of Shandong
ID : 2018YFD0901500
Organisme : National Natural Science Foundation of China
ID : 41976097
Organisme : The Shandong Provincial R&D Program
ID : 2018GHY115019
Informations de copyright
© 2021. The Author(s), under exclusive licence to Springer Nature B.V.
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