| NaCl胁迫对甜瓜叶片气体交换和叶绿素荧光特性的影响 |
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| 引用本文： | 陈年来,张玉鑫,安黎哲. NaCl胁迫对甜瓜叶片气体交换和叶绿素荧光特性的影响[J]. 中国沙漠, 2009, 29(6): 1129-1133 |
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| 作者姓名： | 陈年来 张玉鑫 安黎哲 |
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| 作者单位： | 1.中国科学院 寒区旱区环境与工程研究所, 甘肃 兰州 730000; 2.甘肃农业大学, 甘肃 兰州 730070; 3.甘肃省农业科学院 蔬菜研究所, 甘肃 兰州 730070 |
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| 摘 要： | 以两个变种甜瓜幼苗为材料,在人工控制条件下研究了NaCl胁迫对甜瓜叶片气体交换和叶绿素荧光特性的影响。结果表明,盐胁迫降低了甜瓜叶片光合色素含量、净光合速率、蒸腾速率、气孔导度和PSⅡ最大光化学效率、PSⅡ潜在活性、PSⅡ电子传递量子效率和光化学猝灭系数,使非光化学猝灭系数升高。在≤50 mmol·L-1 NaCl胁迫下,甜瓜叶片光合速率降低主要由气孔因素引起,而在NaCl浓度≥100 mmol·L-1条件下则以非气孔限制因素为主。
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| 关 键 词： | 甜瓜 盐胁迫 光合作用 叶绿素荧光参数 |
| 收稿时间： | 2009-02-05 |
| 修稿时间： | 2009-04-22 |
Effect of NaCl Stress on Gas Exchange and Chlorophyll Fluorescence of Cucumis melo Seedlings |
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| CHEN Nian-lai,ZHANG Yu-xin,AN Li-zhe. Effect of NaCl Stress on Gas Exchange and Chlorophyll Fluorescence of Cucumis melo Seedlings[J]. ournal of Desert Research, 2009, 29(6): 1129-1133 |
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| Authors: | CHEN Nian-lai ZHANG Yu-xin AN Li-zhe |
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| Affiliation: | 1.Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China; 2.College of Agronomy, Gansu Agricultural University, Lanzhou 730070, China; 3.Vegetable Institute, Gansu Academy of Agricultural Science, Lanzhou 730070, China |
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| Abstract: | Muskmelon seedlings, cv. Huanghemi and Baishami, were employed to study the effect of NaCl stress on photosynthesis, chlorophyll contents and chlorophyll fluorescence parameters. The results indicated that net photosynthetic rate ( Pn ), transpiration rate ( Tr ), stomatal conductance ( Gs ), maximum photochemical efficiency of PSⅡ( Fv / Fm ), potential activity of PSⅡ ( Fv / Fo ), quantum efficiency of non-cyclic electron transport of PSⅡ(ΦPSⅡ) and photochemical quenching( qP ) decreased, while non-photochemical quenching( qN ) increased under NaCl stress, especially under high concentrations in both varieties. When NaCl concentration was ≤50 mmol·L~(-1), intercellular CO_2concentration ( Ci ) decreased, while stomatal limitation value ( Ls ) increased. In contrast, Ci increased but Ls decreased when NaCl concentration was ≥100 mmol·L~(-1). The results indicated that photosynthesis of muskmelon was limited by stomatal factor under slight NaCl stress, but mainly by non-stomatal factors under severe NaCl stress. |
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| Keywords: | kmelon NaCl stress photosynthesis chlorophyll fluorescence parameters |
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