Involvement of betacyanin in chilling-induced photoinhibition in leaves of Suaeda salsa

Title:

Involvement of betacyanin in chilling-induced photoinhibition in leaves of Suaeda salsa

Creator:

Wang, C.-Q. and Liu, T.

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:19246db0-aa68-4807-b4b3-7c5cb097a97f
uuid:19246db0-aa68-4807-b4b3-7c5cb097a97f
issn:0300-3604
doi:10.1007/s11099-007-0030-4

Subject:

chlorophyll fluorescence, D1 protein, hydrogen peroxide (H2O2), photosystem 2, and xanthophyll cycle

Type:

model:article and TEXT

Format:

bez média and svazek

Description:

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+B) 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 µmol m-2 s-1 for 3 h) and the subsequent restoration were compared between the C+B seedlings and the control (C) ones. The maximal efficiency of PS2 photochemistry (Fv/Fm), the efficiency of excitation energy capture by open PS2 centres (Fv'/Fm'), and the yield of PS2 electron transport (ΦPS2) of the C+B and C leaves both decreased during photoinhibition. However, smaller decreases in Fv/Fm, Fv'/Fm', and ΦPS2 were observed in the C+B leaves than in C ones. At the same time, the deepoxidation state of xanthophyll cycle, indicated by (A+Z)/(V+A+Z) ratio, increased rapidly but the D1 protein content decreased considerably during the photoinhibition. The increase in rate of (A+Z)/(V+A+Z) was higher but the D1 protein turnover was slower in C+B than C leaves. After photoinhibition treatment, the plants were transferred to a dim irradiation (10 µmol m-2 s-1) 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+B 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+Z)/(V+A+Z) 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. and C.-Q. Wang, T. Liu

Language:

Multiple languages

Rights:

http://creativecommons.org/licenses/by-nc-sa/4.0/
policy:public

Coverage:

182-188

Source:

Photosynthetica | 2007 Volume:45 | Number:2

Harvested from:

CDK

Metadata only:

false