Photosynthetic acclimation: state transitions and adjustment of photosystem stoichiometry--functional relationships between short-term and long-term light quality acclimation in plants.

摘要: In dense plant populations, individuals shade each other resulting in a low-light habitat that is enriched far-red light. This light quality gradient decreases the efficiency of photosynthetic reaction as result imbalanced excitation two photosystems. Plants counteract such conditions by performing acclimation reactions. Two major mechanisms are known to assure efficient photosynthesis: state transitions, which act on short-term timescale; and long-term response, enables re-adjust photosystem stoichiometry favour rate-limiting photosystem. Both processes start with perception via reduction/oxidation (redox) signals from electron transport chain. Recent data Arabidopsis indicate initialization molecular both cases involve activity thylakoid membrane-associated kinase, STN7. Thus, redox-controlled phosphorylation events may not only adjust antenna structure but also affect plastid, well nuclear, gene expression. transitions response have been described mainly terms, while physiological relevance concerning survival reproduction has poorly investigated. studies shed more this topic. Here, we give an overview its effects, possible relationship nonphotochemical quenching, another important mechanism mediates high-light acclimation. Special emphasis given functional roles potential interactions between different strategies. A working model displays various responses integrated system helps plants acclimate changing environment.