Abschlussbericht Projekt: „Verminderung der ... - BLE

Results
Distribution of tubers with different specific gravities within each cultivar. During the
vegetation period of potato crops the specific gravity of tubers might differ due to maturing
time of cultivars, physiological tuber age and environmental and pathogenic impact. Also
tuber skin structures, gas concentration in the periderm and storage conditions might affect
tuber specific gravity (Laboski and Kelling 2007). With respect to these facts potato tubers
of the studied cultivars were separated according to their specific gravities after harvest
and storage periods (Fig. 1 [A, I-III]; Fig. 2 [A, IV-VI]; Fig. 3 [A, VII-IX]).
Cultivars harvested 2005 generated tubers with specific gravities from 1.095 kg
L -1 (Fig. 1). The amount of tubers differing in their specific gravities was normal distributed
within each cultivar, excepted tubers of cv. Marabel. After harvest (Fig. 1 [A, I]) tubers
with a specific gravity of 1.056-1.065 kg L -1 were performed in cvs. of Gala and
Marabel mostly. Tubers with a specific gravity of 1.066-1.075 kg L -1 dominated in all cvs.,
excepted cv. Lolita, because in cv. Lolita and also in cvs. Afra and Adretta tubers with a
specific gravity of 1.076-1.085 kg L -1 were generated. Also tubers with a specific gravity of
1.086-1.095 kg L -1 were produced in the cv. Afra. After storage periods of five (Fig. 1 [A,
II]) and eight months (Fig. 1 [A, III]) we observed no significant changes in the distribution
of tubers differing in their specific gravity within each cultivar. In all cultivars tubers
with a specific gravity of 1.066-1.075 kg L -1 were prevalent.
Cultivars harvested 2006 again originated tubers with specific gravities from 1.095 kg L -1 (Fig. 2). The amount of tubers differing in their specific gravities was normal
distributed within each cultivar. Just yet a high amount of tubers with a specific gravity