Table III.

PCMT activity as affected by age and acclimation temperature of potato tubers

Tuber AgePCMT-II Activity
4°C23°C
months pmol CH3h−1 mg−1 protein
 6 17.5 15.2
18 29.1 19.1
30 33.5 21.7

PCMT was extracted from tubers directly from cold storage (4°C) and after acclimation of tubers to 23°C for 24 h. Assays were conducted at 30°C without exogenous polypeptide substrate. Main effects of age (linear) and temperature were significant (P < 0.05). The age × temperature interaction was not significant.