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Photoperiodic Induction in Silene Armeria as Influenced by Various Light Sources

1957; Botanical Society of Japan; Volume: 70; Issue: 832 Linguagem: Inglês

10.15281/jplantres1887.70.312

2185-3835

Atsushi Takimoto,

Plant Physiology and Cultivation Studies

1) The light of FL-20D (Mazda day-light fluorescent lamp of 20watt) can hardly induce flower on Silene Armeria when supplied to the plant for 10 days. But the light of IL-20 (Mazda incandescent lamp of 20watt) or the combination of FL-20D and IL-20 can readily induce flowering.2) Flickering of light has no marked effect on the photoperiodic induction.3) Light of FL-20pk (Mazda pink fluorescent lamp of 20watt) which contains abundant light of 6000-6500Å is less effective than that of incandescent lamp comprising abundant light of longer wave lengths.4) If during the continuous illumination with FL-20D×2, additive illumination with various duration of IL-20 was supplied daily, flower initiation in percentage increased, following a sigmoid curve, with the increasing duration of supplemental illumination.5) Light of both FL-20D×2 and IL-20 shows the same effect when used as a light break.6) It is concluded that the light of IL-20 with its higher content of longer wave lengths would have a positive flower-promoting effect and that the lower effectiveness of the light of FL-20D may be due to the lack of light of long wave length.