Freezing resistance evaluation of rose stems during frost dehardening using electrical impedance tomography

BMC Plant Biology

Table 1 Comparison of freezing resistance (FR, LT₅₀) in stems of three floribunda rose varieties measured by means of relative electrolyte leakage (REL) and electrical impedance tomography reconstructed values (EIT-RV) (The calculations of FR (LT₅₀) by different methods see “Freezing resistance calculation by means of EIT reconstructed values and EL method values” in detail)

Varieties	Date (Month- Day)	FR (LT₅₀) (°C)
Varieties	Date (Month- Day)	REL (95% Confidence interval) EIT-RV (95% Confidence interval)
‘Red Cap’	2–22	−18.8	−20.36	− 17.21	− 20.1	− 24.74	− 15.42
	3–14	−18.4	− 20.01	− 16.85	− 14.6	−19.14	− 10.15
	4–4	−12.4	− 12.97	− 11.82	− 11.8	− 16.83	−6.69
	4–25	−8.9	−10.06	− 7.82	− 7.3	−32.24	17.59
	5–16	−9.9	−11.08	−8.75	− 5.0^*	− 8.01	−2.01
‘Tender and	2–22	−21.4	−22.28	− 20.51	− 16.0^*	− 17.14	− 14.79
Soft as	3–14	−17.6	− 18.79	− 16.47	− 13.6	−24.14	−3.10
Water’	4–4	−11.9	−12.20	− 11.53	−9.9	− 12.61	− 7.29
	4–25	−8.5	−27.28	10.19	− 6.1	− 12.09	− 0.05
	5–16	− 9.4	− 10.51	− 8.25	−8.2	− 15.95	− 0.46
‘Carefree	2–22	−17.3	− 18.17	−16.45	− 15.8	− 16.78	− 14.81
Wonder’	3–14	− 17.1	− 17.98	− 16.22	− 12.7	− 18.85	− 6.51
	4–4	−10.5	−11.29	− 9.71	− 6.9	− 15.12	1.30
	4–25	− 8.6	− 9.53	−7.67	−6.7	−9.05	− 4.30
	5–16	−9.5	− 10.14	−8.81	− 5.1	−10.74	0.44

The row data with an asterisk (*) show a significant difference (P < 0.05) in freezing resistance with result of the REL method. The differences (P < 0.05) between each row data in freezing resistance of EIT method with results of the REL method for the semi-lethal temperature (LT₅₀, Temperature at which 50% of the plants or organs are killed) for each time instant were considered significant when the values of the Wald 95% confidence intervals did not overlap

ISSN: 1471-2229