Red:far-red light ratio and far-red light integral promote or retard growth and flowering in Eustoma grandiflorum (Raf.) Shinn
Red:far-red light ratio and far-red light integral promote or retard growth and flowering in Eustoma grandiflorum (Raf.) Shinn
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DOI：
10.1016/j.scienta.2008.09.009
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发表时间：
2009-03
影响因子：
4.3
通讯作者：
Asuka Yamada;T. Tanigawa;Takuro Suyama;Takatoshi Matsuno;T. Kunitake
中科院分区：
文献类型：
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作者：
Asuka Yamada;T. Tanigawa;Takuro Suyama;Takatoshi Matsuno;T. Kunitake
使用具有不同红光（R：660±30nm）：远红光（FR：730±30nm）比率或FR光强度的光源对洋桔梗‘Nail Peach Neo’进行夜间休息处理，以研究生长和开花反应。低 R:FR 光源的夜间处理促进了花的萌发和诱导，但高 R:FR 比则延迟了花的萌发和诱导。花芽形成的促进或延迟分别伴随着开花至第一朵小花时主茎上节数的减少或增加。通过R:FR比的对数的S形函数高精度地近似了经夜休处理的植物的可见芽日期与对照的可见芽日期之间的差异。在所用的实验条件下，划分可见芽日期的促进和延迟的阈值R:FR比率约为5.3。促进或延迟可见芽的临界 R:FR 比率分别约为 0.5 和 50.0。此外，从种植到可见芽的时间近似为FR光强度的指数函数。长日照处理的可见芽期最大加速时间为20天，临界FR光强为2.0μmolm−2s−1。结论是，使用不同R:FR比或FR光强度的光源进行长日照处理可以调节大花桉的生长和开花。
Night break treatment was applied to Eustoma grandiflorum ‘Nail Peach Neo’ using light sources with different red (R: 660±30nm): far-red (FR: 730±30nm) ratios or FR light intensities in order to investigate growth and flowering responses. Flower initiation and induction were promoted by night break treatment with a low R:FR light source, but was delayed by a high R:FR ratio. The promotion or delay of flower bud formation was accompanied by a decrease or an increase, respectively, in the number of nodes on the main stem at anthesis to the first floret. The difference between date of visible bud with plants under night break treatment and that of the control was approximated with high accuracy by a sigmoid function of the logarithms of R:FR ratio. The threshold R:FR ratio demarcating the promotion and delay of date of visible bud was about 5.3 under the experimental conditions used. The critical R:FR ratios for promotion or delay of visible bud would be about 0.5 and 50.0, respectively. In addition, the time from planting to visible bud was approximated with an exponential function of FR light intensity. The maximum acceleration of date of visible bud by long-day treatment would be 20 days, and the critical FR light intensity would be 2.0μmolm−2s−1. It is concluded that growth and flowering of E. grandiflorum can be regulated by long-day treatment using light sources with different R:FR ratios or FR light intensities.