| 不同浓度NaCl和Na2CO3处理对菊芋幼苗光合及叶绿素荧光的影响 |
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| 引用本文： | 薛延丰,刘兆普.不同浓度NaCl和Na2CO3处理对菊芋幼苗光合及叶绿素荧光的影响[J].植物生态学报,2008,32(1):161-167. |
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| 作者姓名： | 薛延丰 刘兆普 |
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| 作者单位： | (南京农业大学资源与环境科学学院, 南京 210095) |
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| 基金项目： | 国家高技术研究发展计划(863计划) |
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| 摘 要： | 以砂培菊芋(Helianthus tuberosus)幼苗作为试验材料,分别进行不同浓度NaCl (50、 100、150、200、250 mmol&;#8226;L－1)和Na2CO3 (25、50、 75、100、125 mmol&;#8226;L－1)胁迫处理,以1/2全营养液作为对照,处理7 d后研究NaCl和Na2CO3胁迫处理对菊芋幼苗叶片光合作用及叶绿素动力学 参数的影响。结果表明：1)在NaCl处理下,当浓度小于150 mmol&;#8226;L－1时,增加了菊芋的叶绿素含量、净光合速率(Net photosynthetic rate, Pn)和气孔导度(Stomatal conductivity, Gs),对荧光参数PSⅡ的电子传递情况( Fm/Fo)、PSⅡ原初光能转换效率(Fv/Fm)、PSⅡ量子效率 (Actual quantum yield of PSⅡ under actinic irradiation,φPSⅡ)和光化学猝灭系数(Photochemical quenching coefficient, qP)和非 光化学猝灭系 数(Non-photochemical quenching coefficient, NPQ)没有显著影响,随着浓度的增加,各项生理指标与对照相比除了NPQ显著 增加,其余均显著降低;2)在Na2CO3胁迫处理下,随着Na2CO3浓度的增加,与对照相比菊芋幼苗叶绿素含量、Pn、Gs以及叶绿素a荧光诱导动力 学参数Fm/Fo、Fv/Fm、φPSⅡ和qP均显著降低,NPQ显著增加;3)就NaCl和Na2CO3相比而言,在相同Na+浓度情况下,处于Na2CO3胁迫下的菊芋 幼苗的叶绿素含量、Pn、Gs以及叶绿素a荧光诱导动力学参数Fm/Fo、Fv/Fm、φPSⅡ和qP下降幅度和NPQ的增加幅度均显著大于NaCl,这说明 NaCl和Na2CO3胁迫均对菊芋幼苗造成不同程度的伤害,但在相同Na+浓度情况下,Na2CO3的伤害程度大于NaCl。由此说明菊芋对盐的忍耐程度高 于碱。
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| 关 键 词： | NaCl 2CO3')" Na2CO3" target="_blank">href="#">Na2CO3 菊芋 胁迫 光合作用 荧光 |
| 收稿时间： | 2006-06-12 |
| 修稿时间： | 2006-10-19 |
EFFECTS OF NaCl AND Na2CO3 STRESSES ON PHOTOSYNTHESIS AND PARAMETERS OF CHLOROPHYLL FLUORESCENCE IN HELIANTHUS TUBEROSUS SEEDLINGS |
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| XUE Yan-Feng,LIU Zhao-Pu.EFFECTS OF NaCl AND Na2CO3 STRESSES ON PHOTOSYNTHESIS AND PARAMETERS OF CHLOROPHYLL FLUORESCENCE IN HELIANTHUS TUBEROSUS SEEDLINGS[J].Acta Phytoecologica Sinica,2008,32(1):161-167. |
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| Authors: | XUE Yan-Feng LIU Zhao-Pu |
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| Affiliation: | College of Resources and Environmental Science, Nanjing Agricultural University, Nanjing 210095, China |
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| Abstract: | Aims Our objective was to explore the effects of saline-alkali stress on photosynthetic apparatus of Helianthus tuberosus seedlings. Methods H. tuberosus seedlings were treated with NaCl (50, 100, 150 , 200, 250 mmol&;#8226;L－1) and Na2CO3 (25, 50, 75, 100, 125 mmol&;#8226;L－1) in plastic pots with sand. Others were cultured in modulated half-strength Hoagland solution as a control. We studied the effects of NaCl and Na2CO3 on net photosynthetic rate (Pn) and parameters of chlorophyll fluorescence by measuring chlorophyll content,Pn, stomatal conductivity (Gs) and fluorescence parameters after 7 days. Important findings Significant increases of chlorophyll content, Pn and Gs compared with the control were observed under the 150 mmol&;#8226;L－1 NaCl treatment, whereas there were no effects on fluorescence parameters, Fv/Fm (maximal photochemical efficiency of photosystem Ⅱ (PSⅡ) while all PSⅡ reaction centers are open), Fm/Fo(another expression for the maximal photochemical efficiency of PSⅡ), φPSⅡ(actual quantum yield of PSⅡ under actinic irradiation), qP (photochemical quenching coefficient), and NPQ (non-photochemical quenching coefficient). But with greater NaCl concentration, the chlorophyll content, Pn, Gs and fluorescence parameters significantly decreased except for an increase of NPQ compared with the control. When H. tuberosus seedlings were treated with Na2CO3, chlorophyll content, Pn, Gs, Fv/Fm, Fm/Fo, φPSⅡ and qP significantly decreased and NPQ increased compared with the control. At the same concentration of Na+, the decrease of chlorophyll content, Pn, Gs, Fv/Fm, Fm/Fo, φPSⅡ,qP and the increase of NPQ were higher in Na2CO3 stress than in NaCl stress. All results suggested that the tolerance of H. tuberosus seedlings to saline stress was higher than to alkaline stress. |
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| Keywords: | NaCl Na2CO3 Helianthus tuberosus stress photosynthesis fluorescence |
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