南京林业大学学报(自然科学版) ›› 2021, Vol. 45 ›› Issue (1): 101-106.doi: 10.12302/j.issn.1000-2006.202005007

• 研究论文 • 上一篇    下一篇

丛枝菌根真菌对盐胁迫下桢楠光合生理的影响

崔令军(), 刘瑜霞, 林健, 石开明*()   

  1. 生物资源保护与利用湖北省重点实验室,湖北民族大学,湖北 恩施 445000
  • 收稿日期:2020-05-06 接受日期:2020-11-09 出版日期:2021-01-30 发布日期:2021-02-01
  • 通讯作者: 石开明
  • 基金资助:
    生物资源保护与利用湖北省重点实验室开放基金项目(PT012007);湖北省教育厅项目(B2017094);湖北省“双一流”建设专项资金项目;湖北民族大学博士启动基金项目(MY2017B029)

Effects of AMF on photosynthetic characteristics of Phoebe zhennan under salt stress

CUI Lingjun(), LIU Yuxia, LIN Jian, SHI Kaiming*()   

  1. Key Laboratory of Biological Resources Protection and Utilization of Hubei Province, Hubei Minzu University, Enshi 445000, China
  • Received:2020-05-06 Accepted:2020-11-09 Online:2021-01-30 Published:2021-02-01
  • Contact: SHI Kaiming

摘要:

【目的】研究盐胁迫条件下,桢楠接种丛枝菌根真菌(AMF)后叶片光合色素含量、气体交换参数和叶绿素荧光参数的变化情况,以期为桢楠在盐碱地造林提供参考。【方法】采用分光光度法测定叶绿素a(Chl a)、叶绿素b(Chl b)和类胡萝卜素(Car)含量,采用Li-6400便携式光合仪测定气体交换参数和叶绿素荧光参数。【结果】不同浓度NaCl胁迫下,AMF接种与未接种处理桢楠光合色素含量均呈现显著差异,AMF显著提高了桢楠叶片的光合色素含量。盐胁迫下AMF接种处理后桢楠叶片的净光合速率(Pn)、气孔导度(Gs)、胞间CO2浓度(Ci)和蒸腾速率(Tr)显著高于未接种处理;AMF接种桢楠叶片的最大光化学效率(Fv/Fm)、实际光化学效率(ΦPSⅡ)、光化学淬灭系数(qP)变化不显著,而未接种处理则显著降低;未接种处理的非光化学淬灭系数(NPQ)在盐浓度为300 mmol/L时显著升高,而AMF接种处理的NPQ没有显著变化。双因素方差分析表明,接种AMF对Chl a、Chl b、Car含量和ΦPSⅡ有显著影响。【结论】AMF通过改善光合色素含量、气体交换参数和叶绿素荧光参数,提高了桢楠对光能的利用能力,从而减轻了盐分对桢楠造成的伤害,表明AMF能够增强桢楠的耐盐性,进而促进桢楠在盐碱性土壤中生长。

关键词: 桢楠, 丛枝菌根真菌, 盐胁迫, 光合特性

Abstract:

【Objective】 The effects of arbuscular mycorrhizal fungi (AMF) and salt stress on the photosynthetic pigment content, gas exchange parameters and chlorophyll fluorescence parameters of Phoebe zhennan were studied to provide a reference for afforestation using P. zhennan in saline-alkali land. 【Method】 The contents of chlorophyll a (Chl a), chlorophyll b (Chl b) and carotenoids (Car) were determined by spectrophotometry, and the gas exchange parameters and chlorophyll fluorescence parameters were determined using a Li-6400 portable photosynthesis instrument. 【Result】Under the different concentrations of salt stress, the contents of Chl a, Chl b and Car in the leaves of P. zhennan were significantly different between the AMF and non-AMF treatments, and the AMF significantly increased the chlorophyll content. The net photosynthetic rate (Pn), stomatal conductance (Gs), intercellular CO2 concentration (Ci) and transpiration rate (Tr) in the leaves of P. zhennan with the AMF treatment were significantly higher than those of the non-AMF treatment. The maximal photochemical efficiency of photosystem Ⅱ (Fv/Fm), PSⅡ quantum yield (ΦPSⅡ), and photochemical quenching coefficient (qP) of the AMF treatment leaves under salt stress did not change significantly, whereas those in the non-AMF treatment leaves decreased significantly. The non-photochemical quenching coefficient (NPQ) of non-AMF treatment leaves increased significantly at 300 mmol/L salt concentration, while the AMF treatment leaves were not significantly changed. The two-way analysis of variance showed that the AMF had significant effects on the contents of Chl a, Chl b, Car and ΦPSⅡ. 【Conclusion】The AMF improves the utilization of light energy by P. zhennan by increasing the photosynthetic pigment content, gas exchange parameters, and chlorophyll fluorescence parameters, thereby reducing salt damage to P. zhennan. This shows that the AMF can enhance the salt tolerance of P. zhennan and promote its growth in saline-alkaline soils.

Key words: Phoebe zhennan, arbuscular mycorrhizal fungi (AMF), salt stress, photosynthetic characteristics

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