Nevertheless , negative secondary effects , such as reduced seed set and reduced germination rates , have been observed .
The results of the breeding between the different species showed especially good performing hybrid lines with regard to high tuber yield as well as wide adaptability .
Negative secondary effects , such as reduced seed set and reduced germination rates , have been observed .
The results of the breeding between the different species showed especially good performing hybrid lines with regard to high tuber yield as well as wide adaptability .