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Pb2+、Cd2+复合胁迫对桑树光合作用的影响

张嘉桐 关颖慧 司莉青 彭霞薇 孟丙南 周金星

张嘉桐, 关颖慧, 司莉青, 彭霞薇, 孟丙南, 周金星. Pb2+、Cd2+复合胁迫对桑树光合作用的影响[J]. 北京林业大学学报, 2018, 40(4): 16-23. doi: 10.13332/j.1000-1522.20170332
引用本文: 张嘉桐, 关颖慧, 司莉青, 彭霞薇, 孟丙南, 周金星. Pb2+、Cd2+复合胁迫对桑树光合作用的影响[J]. 北京林业大学学报, 2018, 40(4): 16-23. doi: 10.13332/j.1000-1522.20170332
Zhang Jiatong, Guan Yinghui, Si Liqing, Peng Xiawei, Meng Bingnan, Zhou Jinxing. Effects of Pb2+ and Cd2+ combined stress on photosynthesis of Morus alba[J]. Journal of Beijing Forestry University, 2018, 40(4): 16-23. doi: 10.13332/j.1000-1522.20170332
Citation: Zhang Jiatong, Guan Yinghui, Si Liqing, Peng Xiawei, Meng Bingnan, Zhou Jinxing. Effects of Pb2+ and Cd2+ combined stress on photosynthesis of Morus alba[J]. Journal of Beijing Forestry University, 2018, 40(4): 16-23. doi: 10.13332/j.1000-1522.20170332

Pb2+、Cd2+复合胁迫对桑树光合作用的影响

doi: 10.13332/j.1000-1522.20170332
基金项目: 

北京市科技计划项目 Z151100002115006

详细信息
    作者简介:

    张嘉桐。主要研究方向:土壤重金属污染修复。Email:zjt_1992@bjfu.edu.cn 地址:100083北京市海淀区清华东路35号北京林业大学水土保持学院

    责任作者:

    周金星,教授,博士生导师。主要研究方向:水土保持与荒漠化防治、石漠化治理与生态修复。Email: zjx9277@126.com 地址:同上

  • 中图分类号: S714.5

Effects of Pb2+ and Cd2+ combined stress on photosynthesis of Morus alba

  • 摘要: 目的土壤重金属污染日益严重,重金属对植物的影响备受关注。目前,研究多限于重金属单一胁迫对植物的影响,但土壤重金属污染存在形式并不是只有一种重金属,而是由多种重金属复合而成,研究重金属单一胁迫与复合胁迫对植物生长及光合作用的影响与差异很有必要。方法本研究以桑树幼苗为实验材料,通过添加不同质量分数的Pb2+和Cd2+进行桑树幼苗土培实验,分析单一胁迫与复合胁迫对桑树幼苗生长指标、光合色素含量和光合作用指标的影响与差异。结果Pb2+单一胁迫降低了桑树叶绿素含量和类胡萝卜素含量,Cd2+单一胁迫对叶绿素含量是“低促高抑”,对类胡萝卜素而是随Cd2+含量的增加抑制作用增强。复合胁迫对桑树光合色素含量起到抑制作用,且程度强于单一胁迫。桑树叶片的光饱和点(LSP)、最大净光合速率(Pnmax)、暗呼吸速率(Rd)及表观量子效率(φ)均受到重金属胁迫的抑制作用,且随含量增大,抑制作用增强。单一胁迫和复合胁迫对桑树叶片净光合速率(Pn)、气孔导度(Gs)、胞间CO2浓度(Ci)以及蒸腾速率(Tr)均起到抑制作用,从而显著地限制了桑树的生长。结论重金属单一胁迫及复合胁迫对桑树幼苗的生长指标、光合色素含量以及光合作用均有抑制作用,且重金属含量越高,桑树幼苗受到的抑制作用越强,复合胁迫对桑树幼苗的抑制作用存在协同效应,毒害程度强于单一胁迫;在重金属胁迫条件下,桑树表现出了较强的耐重金属性。

     

  • 图  1  重金属胁迫对桑树叶绿素的影响

    Pb2+、Cd2+、Pb2+-Cd2+分别代表单一铅胁迫、单一镉胁迫、复合胁迫条件下,重金属胁迫对桑树叶绿素的影响。a/b为叶绿素a/叶绿素b。不同小写字母表示不同处理之间差异显著(P<0.05)。下同。

    Figure  1.  Effects of heavy metal stress on chl(a+b) content in mulberry leaves

    Pb2+, Cd2+, Pb2+-Cd2+ mean the effects of heavy metal stress on chl(a+b) content in mulberry leaves under single Pb2+ stress, single Cd2+ stress, Pb2+-Cd2+ combined stress, respectively. a/b means chla/chlb. Different lowercases mean significant difference among raried treatments at P < 0.05 level. The same below.

    图  2  重金属胁迫对桑树类胡萝卜素的影响

    Figure  2.  Effects of heavy metal stress on carotenoid content in mulberry leaves

    图  3  重金属胁迫对桑树叶片光饱和点、光补偿点、最大光合速率、暗呼吸速率及表观量子效率的影响

    Figure  3.  Light responses of light saturation point, light compensation point, Pnmax, dark respiration rate, apparent quanturn yield of Morus alba under different treatments of heavy metals

    图  4  重金属胁迫对桑树光合作用的影响

    Figure  4.  Effects of heavy metal stress on photosynthesis of mulberry leaves

    图  5  重金属胁迫对桑树叶生物量的影响

    Figure  5.  Effects of heavy metal stress on leaf biomass of mulberry leaves

    图  6  重金属胁迫对桑树株高生长的影响

    Figure  6.  Effects of heavy metal stress on plant height of mulberry leaves

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出版历程
  • 收稿日期:  2017-09-12
  • 修回日期:  2017-12-15
  • 刊出日期:  2018-04-01

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