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[目的]研究不同浓度NaCl对油葵幼苗干、鲜重及离子吸收和分布的影响。[方法]采用不同浓度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胁迫时下降约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胁迫时,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]油葵幼苗在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,可能是油葵具有较高耐盐性的原因。
[Objective] The research aimed to study the effects of different NaCl concentrations on dry and fresh weight and ion absorption and distribution of oil sunflower seedlings. [Method] The salt stress environment was simulated by using different concentrations of NaCl solution 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 loss of the leaves was the most obvious, with the decrease of about 60% under the stress of 200mmol / L NaCl and the lowest of the fresh weight of cotyledons, about 13% of the decrease of 200mmol / LNaCl. The dry weight decreased with fresh weight, and the dry weight of roots, stems, leaves and cotyledons decreased by about 35%, 39%, 55% and 8% respectively when compared to the control under 200mmol / L NaCl stress. 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] It is probably the reason that oil sunflower has higher salt tolerance because of maintaining high absorption and transportation of mineral elements and relatively stable ion balance under the stress of NaCl.