DU Meie,WANG Hongxia,ZHANG Wei,et al.Effect of Different Concentration of Salt Stress on Chlorophyll Fluorescence Parameters of Ulmus pumila Seedlings[J].Northern Horticulture,2019,43(05):90-94.[doi:10.11937/bfyy.20182505]
盐胁迫对金叶榆幼苗叶绿素荧光参数的影响
- Title:
- Effect of Different Concentration of Salt Stress on Chlorophyll Fluorescence Parameters of Ulmus pumila Seedlings
- 文献标志码:
- A
- 摘要:
- 为明确不同程度的盐分胁迫对金叶榆幼苗叶绿素荧光参数及净光合速率的影响，以1年生金叶榆（Ulmus pumila）扦插苗为材料，采用盆栽方式研究不同浓度的NaCl（CK：0.00%，T1：20%，T2：40%，T3：60%）对金叶榆幼苗叶绿素荧光参数的影响，为金叶榆在盐渍化土地的合理利用提供参考。结果表明：随盐胁迫程度增加，最大光化学效率（Fv/Fm）、实际光化学量子效率（ФPSⅡ）、电子传导效率（ETR）均呈逐渐降低的趋势，且高浓度盐胁迫处理（T3）的荧光参数显著低于其它处理；随盐胁迫程度加大，非光化学淬灭系数（qN）、光化学淬灭系数（qP）均呈先升高后降低的趋势，且重度胁迫值降为最低，降幅较大。净光合速率（Pn）随盐胁迫程度加大呈先上升后下降的趋势，以T1的Pn最大。因此，高浓度盐胁迫导致金叶榆PSⅡ严重失活、叶绿素荧光参数降低，同时也造成光合系统的破坏。
- Abstract:
- Taking one-year-old cutting seedlings of Ulmus pumila as the test object,the different concentrations of NaCl solutions were used to carry out salt stress for Ulmus pumila in order to research on the changes of chlorophyll fluorescence parameters and net photosynthetic rate.A pot experiment was carried out to investigate the effects of different NaCl levels (CK:0.00%,T1:0.20%,T2:0.40%,T3:0.60%) on chlorophyll fluorescence parameters of seedlings Ulmus pumila.The results showed that with the increasing of the NaCl concentration,the value of Fv/Fm,ФPSⅡ,ETR gradually reduced,whereas the qN and qP firstly increased and then decreased.In addition,the fluorescence parameters of T3 was significantly lower than other treatments.The net photosynthetic rate firstly increased but late decreased with the increasing of salt stress.Moreover,the Pn of T1 was higher than other treatments.Therefore,the high concentration caused severe inactivation of PSⅡ,reduction of chlorophyll fluorescence parameters.It also caused more damage in the photosynthetic system.
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备注/Memo
第一作者简介： 杜美娥（1977-），女，硕士，高级讲师，现主要从事园林植物栽培养护等研究工作。E-mail:meiedu1977@163.com.收稿日期：2018-09-12