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KMID : 0903619780190020117
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Journal of the Korean Society for Horticultural Science
1978 Volume.19 No. 2 p.117 ~ p.128
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Influences of Photoperiod on the Growth and Flowering Responses of Marigold , Salvia , calendula , Petunia , and Zinnia Plants
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Yeam Do-Yi
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Abstract
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The responses of growth and flowering to 8, 12, 16-hour daylengths were studied in several´ garden annuals.
Marigold spp. was a quantitative short-day plant. Salvia splendens L. plant was a intermediate-day plant. Calendula officinalis P. plant was a quantitative long-day plant, and Petunia hybrids Vilm,. plant was a absolute long-day plant.
In short-day plant marigold, long days promoted and extended vegetative growth, while short days accelerated reproductive growth. In long-day plant calendula and petunia, long days promoted reproductive growth, but short days did not retard vegetative growth such as number of leaves and stem diameter, though the plant heights in short days was shorter than that in long days.
The photoperiodic responses of 5 cultivars of marigold, zinnia, and salvia were also studied in relation to plant height and flowering.
Plant height was increased by long days in every cultivars of marigold, zinnia, and salvia. Tallcultivars (marigold ´Golden Lady´, zinnia, ´State Fair´, and salvia ´Hot Jazz Special´, ´America´, and ´Bonfire´) responded to different daylengths by showing the characteristics of quantitative short-day plants, while the first flowering of dwarf cultivars (marigold ´Beauty Yellow´ and ´King Tut´, zinnia ´Thumbelina´ and ´Cherry Button´, and salvia ´Benisugata´ and ´St. John´s Fire´) were not influenced by different daylengths. Further flowering was hastened by short days. But long days surpassed short days in the number of flowers through late growing season.
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