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1994. Flowering and morphogenic responses of new Aster hybrids to photoperiod. -Physiol. Plant. 91: 312-316.Photoperiod treatments of 13, 14.5, 16 and 17.5 h were used to determine the photoperiodic response of the interspecific Aster hybrids 'Painted Lady', "Snowflake' and 'Blue Butterfly' belonging to 'Butterfly' series, under glasshouse conditions. Rate of flowering was higher under 13-h photoperiods decreasing up to 16-h photoperiods. The rate of flowering for 13-and 17.5-h photoperiods. was nearly similar but under the longest photoperiod flowering was erratic and sometitnes abortion of the apical bud was observed. Photoperiod affected the morphology of the plant. Increasing photoperiods up to 16 h induced an increase of internode length of the main axis, of total length of lateral shoots, the number of ray florets. In a 13-h photoperiod the plants produced a paniculate-racemose shaped inflorescence while in longer photoperiods the inflorescence was paniculate-corymbose shaped.

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