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- Title
Involvement of betacyanin in chilling-induced photoinhibition in leaves of Suaeda salsa.
- Authors
C.-Q. Wang; T. Liu
- Abstract
Abstract  Seeds of Suaeda salsa were cultured in dark for 3 d and betacyanin accumulation in seedlings was promoted significantly. Then the seedlings with accumulated betacyanin (C) were transferred to 14/10 h light/dark and used for chilling treatment 15 d later. Photosystem 2 (PS2) photochemistry, D1 protein content, and xanthophyll cycle during the chilling-induced photoinhibition (exposed to 5 C at a moderate photon flux density of 500 mol mâ2 sâ1 for 3 h) and the subsequent restoration were compared between the C seedlings and the control (C) ones. The maximal efficiency of PS2 photochemistry (Fv/Fm), the efficiency of excitation energy capture by open PS2 centres (Fvâ²/Fmâ²), and the yield of PS2 electron transport (ΦPS2) of the C and C leaves both decreased during photoinhibition. However, smaller decreases in Fv/Fm, Fvâ²/Fmâ², and ΦPS2 were observed in the C leaves than in C ones. At the same time, the deepoxidation state of xanthophyll cycle, indicated by (A)/(VϦ) ratio, increased rapidly but the D1 protein content decreased considerably during the photoinhibition. The increase in rate of (A)/(VϦ) was higher but the D1 protein turnover was slower in C than C leaves. After photoinhibition treatment, the plants were transferred to a dim irradiation (10 mol mâ2 sâ1) at 25 C for restoration. During restoration, the chlorophyll (Chl) fluorescence parameters, D1 protein content, and xanthophyll cycle components relaxed gradually, but the rate and level of restoration in the C leaves was greater than those in the C leaves. The addition of betacyanins to the thylakoid solution in vitro resulted in similar changes of Fv/Fm, D1 protein content, and (A)/(VϦ) ratio during the chilling process. Therefore, betacyanin accumulation in S. salsa seedlings may result in higher resistance to photoinhibition, larger slowing down of D1 protein turnover, and enhancement of non-radiative energy dissipation associated with xanthophyll cycle, as well as in greater restoration after photoinhibition than in the control when subjected to chilling at moderate irradiance.
- Subjects
SEEDLINGS; SEED pods; PHOTOSYNTHETIC pigments; TETRAPYRROLES
- Publication
Photosynthetica, 2007, Vol 45, Issue 2, p182
- ISSN
0300-3604
- Publication type
Article
- DOI
10.1007/s11099-007-0030-4