Abstract:

In this paper, the two-year-old seedlings of the apple rootstocks were used to analysis the changes of electrical impedance spectroscopy (EIS) parameters (re、ri、r1、τ) and the relation between the frost hardiness (FH) by means of electrical impedance spectroscopy and conventional electrolyte leakage when shoots of apple rootstocks apple rootstocks under low temperature stress. The results showed that extracellular resistance (re), intracellular resistance (ri) the resistances (r1) and relaxation time (τ) decreased with the temperature being reduced. For the frost-exposed stems, the re, ri, and r1 were highly correlated with the frost hardiness (r=0.838～0.906), but r1 underestimated frost hardiness about 10℃. The results suggested that re and ri could be the suitable parameters to measure the frost hardiness of apple rootstocks freezing, and re was the best parameter.