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Scientia Silvae Sinicae ›› 2014, Vol. 50 ›› Issue (1): 32-40.doi: 10.11707/j.1001-7488.20140106

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Effects of NaCl Stress on Growth and Photosynthetic Characteristics of Elaeagnus angustifolia Seedlings

Liu Zhengxiang1,2, Zhang Huaxin1,2, Yang Sheng1,2, Yang Xiuyan1,2, Di Wenbin3   

  1. 1. Research Center for Saline-Alkali Land of State Forestry Administration Beijing 100091;
    2. State Key Laboratory of Tree Genetics and Breeding Beijing 100091;
    3. Beijing Forestry Survey and Design Institute Beijing 100029
  • Received:2013-02-04 Revised:2013-10-12 Online:2014-01-25 Published:2014-01-25
  • Contact: 张华新

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Abstract:

A pot experiment in greenhouse was conducted to investigate the effects of 0 (control), 120, 240 and 360 mmol·L-1 NaCl treatments on growth, biomass accumulation and allocation, and photosynthetic gas exchange parameters of Elaeagnus angustifolia seedlings, and the correlations between growth parameters and photosynthetic parameters were also analyzed. The results showed that: 1) net height increment, branch number per plant, other growth parameters and biomass accumulation of NaCl-stressed seedlings were all lower or significantly lower than those of the control. With the salt concentration elevated, the above-mentioned growth parameters exhibited a decreasing trend, whereas the root-shoot ratio and root biomass allocation ratio both increased consecutively. 2) With the salt stress aggravated, net photosynthetic rate (Pn), stomatal conductance (Gs), intercellular CO2 content (Ci) and transpiration rate (Tr) generally exhibited a decreasing trend, while stomatal limitation value (Ls) and water use efficiency (WUE) had an increasing trend. Pn, Gs, Ci and Tr of 360 mmol ·L-1 NaCl-treated seedlings were only 57.2%, 22.7%, 62.8%, 38.1% of the control, respectively, whereas the Ls and WUE of the same stressed seedlings were 2.0 and 1.5 times higher than that of the control. 3) Plant height, various leaf growth parameters, whole-plant biomass accumulation and various photosynthetic parameters had all extremely significant and negative correlations with salt stress intensity. Various leaf photosynthetic parameters were significantly or extremely significantly correlated with leaf growth parameters, and there were also significant or extremely significant correlations between parameters of leaf growth and photosynthesis and parameters of biomass accumulation and allocation. In conclusion, our findings suggested that growth and photosynthetic physiology of E. angustifolia seedlings were directly inhibited by NaCl stress, and there were also interactions between leaf photosynthetic capacity and leaf growth parameters, all these factors ultimately brought about a decrease in plant biomass accumulation.

Key words: Elaeagnus angustifolia, NaCl stress, growth, photosynthetic characteristics

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