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摘要:
Malate is the first stable product after CO2 is fixed in NADP-dependent malic enzyme (NADP-ME) type of C4 plants, which transfers CO2 and the reducing equivalent from mesophyll cell (MC) to vascular bundle sheath cell (BSC) chloroplasts and affects the redox state of BSC. The aim of this experiment is to investigate the effect of exogenous malate on the activity of photosystem II (PS II) in C4 and C3 plants. The leaf discs from the 5th fully expanded leaves of maize (NADP-ME type C4 plants) and the 10th fully expanded leaves of tobacco (C3 plants) were treated with malate of 50, 100 μM and the chlorophyll fluorescence parameters were measured. Malate treatments decreased the photochemical reaction efficiency (FV/FM) in maize leaves, as a result of rising in initial fluorescence (FO) and decreasing in maximal fluorescence (FM). The number of active PS II reaction center (RC) per excited cross section (RC/CS) declined in malate-treated maize, suggesting that malate inactivated PS II RC. Malate treatments also increased Wk, representing the severity of oxygen-evolving complex (OEC) damage, and decreased the rate of photosynthetic oxygen evolution. We conclude that exogenous malate regulates the activity and structure of PS II in C4 plant maize. No significant changes in the activity of PS II were observed in malate-treated C3 plant tobacco. It is suggested that the short term malate treatment will inhibit PS II of leaves which have C4 anatomy and C4 enzymes.
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篇名 Different Effects of Malate on the Activities of Photosystem II in Detached Leaves of Maize and Tobacco
来源期刊 美国植物学期刊(英文) 学科 医学
关键词 MALATE PHOTOSYSTEM II CHLOROPHYLL Fluorescence MAIZE Tobacco
年,卷(期) 2015,(11) 所属期刊栏目
研究方向 页码范围 1734-1741
页数 8页 分类号 R73
字数 语种
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研究主题发展历程
节点文献
MALATE
PHOTOSYSTEM
II
CHLOROPHYLL
Fluorescence
MAIZE
Tobacco
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研究去脉
引文网络交叉学科
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期刊影响力
美国植物学期刊(英文)
月刊
2158-2742
武汉市江夏区汤逊湖北路38号光谷总部空间
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1814
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0
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