Impact of Salt Stress on Growth and Ion Uptake of Different Parts of Oil Sunflower Seedlings

盐胁迫对油葵幼苗生长及离子吸收、分布的影响(摘要)(英文)

[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 mmol/L 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; Mg2＋ content was slightly increased. [Conclusion] Oil sunflower maintained high mineral ion absorptionunder salt stress,that maybe the part reason for high salt tolerance of oil sunflower seedlings.

[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。