Effects of light and genetic origin on in vitro tuberization of potato
2000
Dobr nszky,J.
The effects of environmental factors (photoperiod and light intensity) on in vitro tuberization were analysed on five potato cultivars of different genetic origin representing various maturity groups.No growth regulators were added to the culture media to avoid the potential effect(s) of growth regulators on the response to environmental stimuli.An 8% sucrose treatment was used for tuber initiation.Light (short-day treatment) applied after the induction phase delayed or inhibited tuber initiation.By contrast, darkness applied after the tuber induction stage accelerated and synchronized tuber initiation after high light intensity.No relationship was observed between the maturity groups of the tested cultivers and their tuber initiation response.The tuber number (-2mm) per shoot varied from 1.19 to 1.52 depending on the cultivar in the best treatments.Consequently, the manipulation of light alone gave reliable tuberization.
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