Effect of Photoperiod on Flower Bud Development of Ornamental Sunflowers (Helianthus annuus L.)
Effect of Photoperiod on Flower Bud Development of Ornamental Sunflowers (Helianthus annuus L.)
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光周期对观赏向日葵（Helianthus annuus L.）花芽发育的影响
DOI：
10.2503/jjshs.69.708
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发表时间：
2000
影响因子：
--
通讯作者：
Y. Imaizumi
中科院分区：
文献类型：
--
作者：
Y. Hayata;Y. Imaizumi
为缩短观赏向日葵的生育期，改进商业化栽培技术，研究了光周期对4种日本观赏向日葵花蕾发育的影响。短日照处理缩短了所有品种从播种到花蕾发育的天数;相同的处理缩短了'Big Smile'和'Sunrich Orange'的花芽分化至开花（FDF）的时间，而长日照处理加速了'Taiyo'的FDF。短/长日或日间中性治疗的组合在“情人节”中促进了FDF。花芽分化开始后，品种间株高差异不显著。与其他处理相比，长日照处理产生了更高的植物。除“大微笑”外，其它品种的花径在光周期处理间无差异。这些结果表明，一些品种需要不同的日长，这取决于它们的生长阶段，即，从播种到花芽分化，从花芽分化发育到开花。因此，我们建议为每个栽培品种建立每个生长阶段的适当光周期处理。
The effect of photoperiod on flower bud development in four ornamental sunflowers in Japan was investigated in an effort to shorten the growing period and to improve commercial cultivation techniques. The number of days from sowing to flower bud development for all cultivars was shortened in the short-day treatment ; the same treatment shortened the period between flower bud differentiation to anthesis (FDF) for 'Big Smile' and 'Sunrich Orange', whereas, a long-day treatment hastened FDF for 'Taiyo'. A combination of short/long-day, or day-neutral treatments advanced FDF in 'Valentine'. There were no significant differences in plant height among the cultivars after the onset of flower bud differentiation. The long-day treatment yielded taller plants compared to the other treatments. There was no difference in the flower diameter between the photoperiodic treatments for all cultivars except 'Big Smile'. These results indicate that some cultivars require different day-lengths, depending on their growth stage, i.e., from sowing to flower bud initiation and from flower bud differentiation and development to anthesis. Hence, we recommend that the proper photoperiodic treatment for each growth stage be established for each cultiver.