Table 2. Nonacclimated freezing tolerance (RFT) and acclimation capacity (ΔRFT), and acclimated freezing tolerance at 4°C day/2°C night for three Solanumm species.

Solanum species	Noacclimated freezing tolerance	Acclimated freezing tolerance	Acclimation capacity
	(RFT in °C)	(RFT in °C)	(ΔRFT in °C)
S. commersonii	–3.4 ± 0.20 bB	–10.1 ± 0.31 aA	6.8 ± 0.50 aA
S. acaule	–5.3 ± 0.08 aA	–8.9 ± 0.90 bA	3.5 ± 1.15 bB
S. cardiophyllum	–1.8 ± 0.07 cC	–2.3 ± 0.42 cB	0.5 ± 0.36 cC

Acclimation capacity (ΔRFT) was assessed as acclimated RFT minus nonacclimated RFT.

RFT was determined from the midpoint of the maximum and minimum (control) ion leakage values obtainied from each species (24)

Standard error calculated from three experiments. Data are means plus standard errors. Values followed by different letters are significantly different at P ≤ 0.01 (capital letters) or P ≤ 0.05 (small letters).