盐碱胁迫对平欧杂种榛枝条电阻抗图谱参数及离子含量的影响

为探讨平欧杂种榛枝条对盐碱胁迫的适应性，测定‘辽榛3号’当年生枝条在中性盐(NaCl)、碱性盐(Na₂CO₃)及混合盐3种盐碱胁迫下各项电阻抗图谱(EIS)参数的变化及主要矿质元素含量，分析各电阻抗参数及矿质离子含量的相关性.结果表明： 随着NaCl浓度的增加，电阻抗参数高频电阻率(r)、低频电阻率(r₁)、胞内电阻率(r_i)和胞外电阻率(r_e)均表现出先降低后增加再降低的变化趋势；Na₂CO₃胁迫下，各参数则呈现持续上升的变化规律；混合盐碱胁迫下，r₁、r_e随盐浓度增加持续降低，Na⁺含量在3种类型盐碱胁迫下均随浓度的增加而上升，且NaCl胁迫>混合盐碱胁迫> Na₂CO₃胁迫；Na₂CO₃胁迫导致了Zn、B、Ca 3种元素含量的降低.5种阳离子总量与r₁、r_e、弛豫时间(τ)、弛豫时间分布系数(Ψ)呈显著负相关.平欧杂种榛枝条能耐200 mmol·L^-1碱性盐胁迫，而对中性盐的忍耐能力介于100～150 mmol·L^-1.

Effects of saline alkali stress on electrical impedance spectroscopy parameters and ion contents in shoots of Ping’ou hybrid hazelnut.

To study the adaptability to salt alkaline stress of Ping’ou hybrid hazelnut, ‘Liaozhen 3’ shoots which were treated with three types of stress neutral NaCl, alkaline Na₂CO₃, and mixed salt alkali, and the changes in electrical impedance spectroscopy (EIS) parameters and mineral ion contents were subsequently determined. The correlations between the EIS parameters and mineral ion contents were analyzed. The results showed that with the increasing level of NaCl, specific high frequency resistance (r), specific low frequency resistance (r₁), specific intracellular resistance (r_i) and specific extracellular resistance (r_e) of shoots decreased firstly, then increased, and finally decreased again. However, these parameters increased gradually with the increasing level of Na₂CO₃, while r₁ and r_e decreased slowly in the mixed salt alkali treatments. The Na⁺ contents of shoots increased significantly under the three salt alkali stresses with the order of NaCl stress > mixed salt alkali stress > Na₂CO₃ stress. Furthermore, Na₂CO₃ stress resulted in the decreases in the contents of three elements Zn, B and Ca. The significant negative correlation was found between the sum of five cations and four EIS parameters r₁, r_e, relaxation time (τ), and distribution coefficient of relaxation time (Ψ). The shoots of ‘Liaozhen 3’ might be tolerant of Na₂CO₃ stress of 200 mmol·L^-1, while they could be resistant to NaCl stress of 100-150 mmol·L^-1.