Abschlussbericht Projekt: „Verminderung der ... - BLE

dures between normally distributed quality parameters were performed using Pearson correlation
coefficients.
Results
As the stem end of potato tubers is physiologically and histologically older than the bud
end (Bajema et al., 1998b) and might display some differences in both physiological properties
and blackspot susceptibility (Lærke, 2001) water relation and tissue elasticity were
analysed separately for both tuber parts. However, no significant differences in water potential,
osmolality, osmotic potential, pressure potential and the modulus of elasticity between
both parts could be revealed. Hence, data of stem and bud ends of tubers were
pooled. Also, the water potentials did not differ significantly between cultivars. Therefore,
presented data reflect the mean water potentials of both stem end and bud end tissue of a
selection of tubers differing in their specific gravity regardless of the respective cultivar
(Tab. 1, 2).
Tubers harvested in 2006 showed specific gravities in the range of 1.055 and 1.095 kg L -1
(Tab. 1). Their absolute water concentration was negatively correlated with specific gravity
(r= -0.86, p