Impact of salt stress on growth and ion uptake of different parts of oil sunflower seedlings | 杩娌硅靛辜垮绂诲告躲甯褰卞
2011
Yang Xiaocui, Chinese Academy of Sciences, Lanzhou (China), Institute of Modern Physics | Li Wenjian, Chinese Academy of Sciences, Lanzhou (China), Institute of Modern Physics | Qu Ying, Chinese Academy of Sciences, Lanzhou (China), Institute of Modern Physics
[Objective] The purpose was to discuss the effects of different NaCl concentrations on fresh weight and dry weight, ion absorption and distribution in oil sunflower seedlings. [Method] Under the simulated salt environment by using NaCl solutions at different concentrations, the dry weight, fresh weight and ion content of oil sunflower seedlings were determined. [Result] With the increase of NaCl concentration, the growth rate of oil sunflower seedling was inhibited. In addition, its fresh weight and dry weight also decreased; the fresh weight of leaf decreased most significantly by 60%, and that of cotyledon decreased most slightly by 13% at 200 mM NaCl concentration. The dry weight of root, stem, leaf and cotyledon decreased by 35%, 39%, 55% and 8% respectively, showing a similar decreasing trend with fresh weight. Under NaCl stress, Na+ content in root and stem of oil sunflower seedling increased while K+ decreased. Na+ content was mainly concentrated in roots and stems much more than in leaves; K+ content in roots decreased most significantly by 21% compared with control, and it was relatively high in leaf. Ca2+ and Mg2+ content was decreased slightly in roots and stems; Ca2+ content in leaves and cotyledons was stable; Mg 2+ content was slightly increased. [Conclusion] Oil sunflower maintained high mineral ion absorption under salt stress, that maybe the part reason for high salt tolerance of oil sunflower seedlings.
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