Influence of arbuscular mycorrhiza on organic solutes in maize leaves under salt stress |
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Authors: | Min Sheng Ming Tang Fengfeng Zhang Yanhui Huang |
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Institution: | (1) College of Life Science, Northwest A&F University, Yangling, Shaanxi, 712100, China;(2) College of Forestry, Northwest A&F University, Yangling, Shaanxi, 712100, China; |
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Abstract: | A pot experiment was conducted to examine the effect of the arbuscular mycorrhizal (AM) fungus, Glomus mosseae, on plant biomass and organic solute accumulation in maize leaves. Maize plants were grown in sand and soil mixture with
three NaCl levels (0, 0.5, and 1.0 g kg−1 dry substrate) for 55 days, after 15 days of establishment under non-saline conditions. At all salinity levels, mycorrhizal
plants had higher biomass and higher accumulation of organic solutes in leaves, which were dominated by soluble sugars, reducing
sugars, soluble protein, and organic acids in both mycorrhizal and non-mycorrhizal plants. The relative abundance of free
amino acids and proline in total organic solutes was lower in mycorrhizal than in non-mycorrhizal plants, while that of reducing
sugars was higher. In addition, the AM symbiosis raised the concentrations of soluble sugars, reducing sugars, soluble protein,
total organic acids, oxalic acid, fumaric acid, acetic acid, malic acid, and citric acid and decreased the concentrations
of total free amino acids, proline, formic acid, and succinic acid in maize leaves. In mycorrhizal plants, the dominant organic
acid was oxalic acid, while in non-mycorrhizal plants, the dominant organic acid was succinic acid. All the results presented
here indicate that the accumulation of organic solutes in leaves is a specific physiological response of maize plants to the
AM symbiosis, which could mitigate the negative impact of soil salinity on plant productivity. |
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