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[目的]研究不同NaCl浓度对油葵幼苗干、鲜重变化及离子吸收和分布的影响。[方法]不同浓度NaCl溶液模拟盐胁迫环境,测定油葵幼苗干、鲜重及离子含量。[结果]NaCl胁迫抑制油葵幼苗生长,降低了幼苗干、鲜重。叶片鲜重下降最明显,200mmol/LNaCl时下降约60%;子叶鲜重下降最少,200mmol/LNaCl时下降约13%。干重的下降程度同鲜重相似,200mmol/LNaCl时根、茎、叶、子叶的干重与对照组相比分别下降约35%、39%、55%和8%。NaCl胁迫下,油葵幼苗根和茎中Na+含量上升,K+含量下降;Na+主要集中在根和茎中,叶片中较少;根中K+含量下降最明显,叶片中K+含量相对较高。根和茎中Ca2+、Mg2+含量下降,叶片和子叶中Ca2+含量相对稳定,子叶中Mg2+含量略上升。[结论]葵幼苗在NaCl胁迫下保持较高的矿物质元素吸收和运输以及相对稳定的离子平衡,这可能是油葵具有较高耐盐性的部分原因。
[Objective] The research aimed to study the effects of NaCl concentration on the dry and fresh weight of seedlings and the ion absorption and distribution. [Method] The NaCl stress solution with different concentrations of NaCl solution was simulated to determine the dry, fresh weight and ion content of oil sunflower seedlings. [Result] NaCl stress inhibited the growth of oil sunflower seedlings and decreased the dry and fresh weight of seedlings. The fresh weight of leaves decreased the most obviously, about 60% when 200 mmol / L NaCl was added, the fresh weight of cotyledons decreased the least, about 13% when 200 mmol / L NaCl was dropped. Dry weight decreased with fresh weight. The dry weight of roots, stems, leaves and cotyledons decreased by 35%, 39%, 55% and 8% respectively when compared with the control at 200mmol / L NaCl. Under NaCI stress, the content of Na + in root and stem of oil sunflower seedlings increased and the content of K + decreased; Na + mainly concentrated in roots and stems, but less in leaves; K + content in root decreased most obviously and K + content in leaves was relatively high. The contents of Ca2 + and Mg2 + in roots and stems decreased, the content of Ca2 + in leaves and cotyledons was relatively stable, and the content of Mg2 + in cotyledons slightly increased. [Conclusion] The seedlings maintained high absorption and transport of mineral elements and relatively stable ion balance under NaCl stress, which may be partly responsible for the higher salt tolerance of oil sunflower.