Ion distribution, absorption and translocation characteristics of Alhagi sparsifolia in adaptation to saline habitat.

doi:10.13287/j.1001-9332.201611.013

Abstract

Abstract: In order to explore the adaptive capacity of Alhagi sparsifolia to soil salinity (mild, mo-derate, severe saline soil), the distribution, adsorption and translocation characteristics of Na⁺, K⁺, Ca²⁺, Mg²⁺ in different organs of A. sparsifolia, which is a dominant native vegetation in southern edge of Tarim basin, were investigated. The results showed that when grown on a mild and moderate saline soil, Na⁺ distribution in different organs of A. sparsifolia followed the order of stem≈thorn>leaf>root; when grown on a severe saline soil, Na⁺ distribution followed leaf>stem≈thorn>root. The distribution of Ca²⁺ and Mg²⁺ followed leaf >thorn>stem>root. With the increase of soil salt level, Na⁺ content in different organs of A. sparsifolia increased, while K⁺ content in leave decreased; meanwhile the increasing soil salt level significantly decreased the K⁺/Na⁺ ratio in both root and leave, as well as the Ca²⁺/Na⁺ and Mg²⁺/Na⁺ ratios in all organs. The selective transportation coefficients for Ca²⁺-Na⁺and Mg²⁺-Na⁺ followed order of stem-leaf>stem-thorn>root-stem under saline habitats. Based on the integrated analysis, in order to adapt to salinity habitat, A. sparsifolia could use multiple organs to accumulate Na⁺, depending on soil salt level. Na⁺ could accumulate in stem and thorn at a relative low level, but in leaves at high levels. Besides, Ca²⁺and Mg²⁺ could be the inorganic osmotic adjustment substances for A. sparsifolia to adapt the saline environment.

Key words: Alhagi sparsifolia, saline and alkaline land, ion, adaptability

LUO Han-lin, ZENG Fan-jiang, ZHANG Bo, LIU Bo, ZHAO Sheng-long, GAO Huan-huan. Ion distribution, absorption and translocation characteristics of Alhagi sparsifolia in adaptation to saline habitat.[J]. Chinese Journal of Applied Ecology, 2016, 27(11): 3514-3520.

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