JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2021, Vol. 45 ›› Issue (1): 101-106.doi: 10.12302/j.issn.1000-2006.202005007

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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 E-mail:lingjuncui@163.com;skm331@163.com

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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