Photosynthetica, 2007 (vol. 45), issue 3

Photosynthetica 2007, 45(3):447-454 | DOI: 10.1007/s11099-007-0074-5

Response of xanthophyll cycle and chloroplastic antioxidant enzymes to chilling stress in tomato over-expressing glycerol-3-phosphate acyltransferase gene

N. Sui1, M. Li2, X. Y. Liu1, N. Wang1, W. Fang1, Q. W. Meng1,*
1 College of Life Sciences, Key Lab of Crop Biology of Shandong Province, Shandong Agricultural University, Tai'an, P.R. China
2 Shandong Academy of Agricultural Sciences, Ji'nan, P.R. China

Over-expression of chloroplastic glycerol-3-phosphate acyltransferase gene (LeGPAT) increased unsaturated fatty acid contents in phosphatidylglycerol (PG) of thylakoid membrane in tomato. The effect of this increase on the xanthophyll cycle and chloroplast antioxidant enzymes was examined by comparing wild type (WT) tomato with the transgenic (TG) lines at chilling temperature (4 °C) under low irradiance (100 µmol m-2 s-1). Net photosynthetic rate and the maximal photochemical efficiency of photosystem (PS) 2 (Fv/Fm) in TG plants decreased more slowly during chilling stress and Fv/Fm recovered faster than that in WT plants under optimal conditions. The oxidizable P700 in both WT and TG plants decreased during chilling stress under low irradiance, but recovered faster in TG plants than in the WT ones. During chilling stress, non-photochemical quenching (NPQ) and the de-epoxidized ratio of xanthophyll cycle in WT plants were lower than those of TG tomatoes. The higher activities of superoxide dismutase (SOD) and ascorbate peroxidase (APX) in TG plants resulted in the reduction of O2 -. and H2O2 contents during chilling stress. Hence the increase in content of unsaturated fatty acids in PG by the over-expression of LeGPAT could alleviate photoinhibition of PS2 and PS1 by improving the de-epoxidized ratio of xanthophyll cycle and activities of SOD and APX in chloroplast.

Keywords: ascorbate peroxidase; glycerol-3-phosphate acyltransferase; hydrogen peroxide; Lycopersicon; net photosynthetic rate; photosystems 1 and 2; quenching; superoxide dismutase

Received: January 2, 2007; Accepted: March 12, 2007; Published: September 1, 2007Show citation

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Sui, N., Li, M., Liu, X.Y., Wang, N., Fang, W., & Meng, Q.W. (2007). Response of xanthophyll cycle and chloroplastic antioxidant enzymes to chilling stress in tomato over-expressing glycerol-3-phosphate acyltransferase gene. Photosynthetica, 45(3), 447-454. doi: 10.1007/s11099-007-0074-5.
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