The relationship between red/far-red ratio (R/FR ratio) of LED chips and flowering inhibition, by LED light sources with the same power consumption, was evaluated using two cultivars of chrysanthemum, the autumn flowering ‘Jimba’ and summer-to-autumn flowering ‘Iwano-hakusen’. The combinations of light intensity of the R and FR LED chips emitting at wavelengths of 632 nm and 734 nm, respectively, were set as 5 : 0, 4 : 1, 3 : 2, 2 : 3, 1 : 4, and 0 : 5. The six LED light bulbs were divided into short- and long-term lighting to detect differences in the effects of flowering inhibition due to differences in light quality. The long- and short-term lighting treatments were set at 4 h and 30 min, respectively, for ‘Iwano-hakusen’ and 2 h and 4 min, respectively, for ‘Jimba’. In the short-term lighting treatment, a high flowering inhibitory effect was obtained with the R5:FR0 chip combination in both cultivars. In long-term lighting treatment, the responses to light quality differed between the cultivars: flowering inhibition in ‘Iwano-hakusen’ was highly effective at R3:FR2 and R2:FR3; however, in ‘Jimba’ a marked inhibitory effect was obtained at R5:FR0. Long-term lighting by R + FR light resulted in a high flowering inhibitory effect in ‘Iwano-hakusen’. This suggested the involvement of high irradiation response via the phytochrome phyA.
"},{"@language":"ja","@value":"同一消費電力のLED光源におけるR光チップとFR光チップの割合（R/FR比）と花芽分化抑制効果の関係を，電照による花成抑制が容易でない夏秋ギク品種‘岩の白扇’と容易な秋ギク品種‘神馬’の2品種を用いて検討した．試験は，波長632 nmのR光LEDチップおよび波長730 nmのFR光チップをそれぞれ5 : 0，4 : 1，3 : 2，2 : 3，1 : 4，0 : 5として，合計5チップになるように製作された6種類のLED電球を供試し，品種ごとにそれぞれ異なる長時間および短時間電照区を設置した．‘岩の白扇’では長時間電照区を4時間電照，短時間電照区を30分電照，‘神馬’では長時間電照区を2時間電照，短時間電照区を4分電照として，光質の違いによる花成抑制の効果の違いが検出しやすいようにした．長時間電照では，品種で光質に対する反応が異なり，‘岩の白扇’はR3:FR2，R2:FR3区で花成抑制効果が高かったが，‘神馬’は，R5:FR0区で高い花成抑制効果が得られた．短時間電照では両品種ともにR5:FR0で高い花成抑制効果が得られた．‘岩の白扇’はR + FR光による長時間の電照で高い花成抑制効果が得られたことから，フィトクロムの分子種の1つであるphyAを介した高照射反応（HIR）の関与が示唆された．
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