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KMID : 0903619990400020265
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Journal of the Korean Society for Horticultural Science
1999 Volume.40 No. 2 p.265 ~ p.270
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Effects of Different Seeding Dates and Light Intensities on the Growth , Flowering , and Photosynthetic Assimilates of Petunia
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Abstract
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In order to elucidate prevailing effects of varied light intensities and seeding times (March 30, May 30, July 30) on the flowering habit of petunia, a series of experiments were conducted with 6 different cultivars in the outdoor of Chonan, Korea. Plant height and flower diameter were higher in the treatment of half sun condition and seeding on May 30 than other treatments, regardless of cultivar. The greatest number of flowers and the earliest flowering appeared in the sun condition and seeding on May 30, irrespective of cultivar. The duration of flowering, however, lasted longer in the half sun and seeding on March 30 prolonged flowering period 40% over that of the usual cultural practices. The general growth and flowering extent were found to be most vigorous when plant was seeded on May 30. Total carbohydrate such as sugar and starch contents, somewhat, more increased in the sun than other light intensities, but there was no differences in starch contents. Between treatments total carbohydrates increased with increasing light intensity. Levels of sugar and starch were most highest in the treatment on May 30. Therefore, these results suggested that total carbohydrate contents was closely related with the flowering habit of petunia. The activity of invertase, an sucrose dehydrating enzyme was 20-30%o lower level in the sun than other light intensities, whereas sucrose synthase was 30% higher level in the sun, indicating that these activities were closely associated with flowering habit of petunia.
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