Abstract
Abstract The effect of donor plant photoperiod on subsequent in vitro adventitious bud production of Begonia × hiemalis (Fotsch) cv. Schwabenland Pink was monitored by sampling petiole explants from plants maintained in either short- (8 hr, SD) or long-day (16 hr, LD) photoperiods. Adventitious bud production on SD and LD explants was similar for the first 28 days of treatment. A subsequent loss of regenerative capacity occurred in SD explants and was associated with the changing physiological status of the donor plant. Maintaining donor plants in LD increased bud production and extended the time during which the donor plants could be used effectively in commercial micropropagation programs.
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