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首页> 外文期刊>Photosynthetica >Response of xanthophyll cycle and chloroplastic antioxidant enzymes to chilling stress in tomato over-expressing glycerol-3-phosphate acyltransferase gene
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Response of xanthophyll cycle and chloroplastic antioxidant enzymes to chilling stress in tomato over-expressing glycerol-3-phosphate acyltransferase gene

机译：叶绿素循环和叶绿体抗氧化酶对番茄过表达3-磷酸甘油酰基转移酶基因的冷胁迫的响应

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摘要

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.
机译：过量表达氯塑料3-磷酸甘油酰基转移酶基因（LeGPAT）可增加番茄类囊体膜磷脂酰甘油（PG）中的不饱和脂肪酸含量。通过在低辐照度（100μmolm？2 s？1 ）。低温胁迫下TG植物的净光合速率和光系统（PS）2（Fv / Fm ）的最大光化学效率下降较慢，Fv / Fm 恢复较快在最佳条件下比野生型植物要好。在低辐照度的低温胁迫下，野生型和TG型植株中可氧化的P700均降低，但TG型植株中的可氧化P700恢复速度比野生型植株快。在低温胁迫下，野生型植物的非光化学猝灭（NPQ）和叶黄素循环的脱环氧化率均低于TG番茄。 TG植物中超氧化物歧化酶（SOD）和抗坏血酸过氧化物酶（APX）的较高活性导致冷胁迫期间O2 α·和H2 O2 的含量降低。因此，LeGPAT的过表达增加了PG中不饱和脂肪酸的含量，可以通过改善叶绿素循环的脱环比率以及叶绿体中SOD和APX的活性来减轻PS2和PS1的光抑制。

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  • 来源
    《Photosynthetica》 |2007年第3期|447-454|共8页
  • 作者

    N. Sui; M. Li; X.-Y. Liu; N. Wang; W. Fang; Q.-W. Meng;

  • 作者单位

    College of Life Sciences Key Lab of Crop Biology of Shandong Province Shandong Agricultural University Tai’an 271018 P.R. China;

    Shandong Academy of Agricultural Sciences Ji’nan 250100 P.R. China;

    College of Life Sciences Key Lab of Crop Biology of Shandong Province Shandong Agricultural University Tai’an 271018 P.R. China;

    College of Life Sciences Key Lab of Crop Biology of Shandong Province Shandong Agricultural University Tai’an 271018 P.R. China;

    College of Life Sciences Key Lab of Crop Biology of Shandong Province Shandong Agricultural University Tai’an 271018 P.R. China;

    College of Life Sciences Key Lab of Crop Biology of Shandong Province Shandong Agricultural University Tai’an 271018 P.R. China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

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

    机译：抗坏血酸过氧化物酶;3-磷酸甘油酰基转移酶;过氧化氢;Lycopersicon;净光合速率;光系统1和2;猝灭;超氧化物歧化酶;

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