| Effects of alkali stress on growth, structure and photosynthetic parameters of Lycium barbarum L. |
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| DOI：10.7606/j.issn.1000-7601.2017.04.36 |
| Key Words: alkali stress Lycium barbarum L. growth structure photosynthetic parameter |
| Author Name | Affiliation | | MAO Gui-lian | College of Life Science, Ningxia University, Yinchuan, Ningxia 750021, China | | LIANG Wen-yu | College of Life Science, Ningxia University, Yinchuan, Ningxia 750021, China | | WANG Sheng | College of Life Science, Ningxia University, Yinchuan, Ningxia 750021, China
Key Laboratory of Ministry of Education for Protection and Utilization of Special Biological Resources in Western China, Yinchuan, Ningxia 750021, China | | XU Xing | College of Agriculture, Ningxia University, Yinchuan, Ningxia 750021, China | | ZHENG Rui | College of Life Science, Ningxia University, Yinchuan, Ningxia 750021, China | | ZHU Zhi-ming | College of Agriculture, Ningxia University, Yinchuan, Ningxia 750021, China |
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| Abstract: |
| To reveal the relationship between the growth, structure, photosynthesis, and the potential mechanism of salt-alkali resistance of Lycium barbarum L., the growth, anatomical structure, ultrastructure and photosynthetic parameters were investigated under alkali stress in pot experiments. The results showed that with the increase in concentration of NaHCO3, the net height first increased and then decreased, the top dry weight, the root dry weight, and the whole dry weight decreased, and the root to top ratio increased. With the increase in concentration of NaHCO3, the number of cell layer of palisade tissue and the cell structure compactness decreased, and thickness of leaves, upper Epidermis thickness, lower Epidermis thickness and crystal number first increased and then decreased. With the increase in concentration of NaHCO3, irregular form of mesophyll cell, deformation of chloroplast, disrupted granum lamellae and increased starch number were observed. The net photosynthetic rate (Pn), stomatal conductance(Gs), transpiration rate(Tr), and stomatal limitation(Ls) decreased, and intercellular CO2 concentration and water use efficiency(WUE) first increased and then decreased when the concentration of NaHCO3 increased. Plant net growth increment, whole plant-biomass accumulation, Pn, Tr, Ls and Gs were negatively correlated to alkali stress intensity, and significantly negative correlations was found between Pn, Tr, Gs and alkaline stress intensity of Lycium barbarum L. The results suggested the functional traits of Lycium barbarum L. were inhibited by higher NaHCO3 stress, which reduced the photosynthesis, and thus ultimately a decrease in biomass accumulation and the growth was brought about. |
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