Effect of Seedling Age, Photoperiod, and Temperature on Bolting and Inflorescence Quality in Delphinium.

Kikuchi, Kaori; Kanayama, Yoshinori; Wakamoto, Y; Kanahama, Koki

doi:10.2503/jjshs.69.446

Cited by 8 publications

(6 citation statements)

References 7 publications

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“…The number of leaves was greater in long-day conditions (24-h photoperiod) with white light after 8 weeks, likely because light intensity with the white light was higher than the other light types. Because G. paniculata is a long-day plant (Kikuchi et al 2000), flowering was promoted under long-day conditions with white light and was not promoted under short-day conditions (Table 1).…”

Section: Resultsmentioning

confidence: 99%

“…However, irradiation with a single light type, instead of natural light, throughout light periods may not result in normal growth and may be impractical (Heo et al 2002). Alternatively, in the production of longday cut flowers, plants are grown under natural light in the daytime and their flowering is controlled by long-day treatment with artificial lighting of much lower intensity in the night (Kristiansen 1988;Kikuchi et al 2000;Islam et al 2005;Yamada et al 2008). The promotion of flowering in Eustoma grandiflorum by long-day treatment with far-red rich fluorescent lamps has been reported previously (Sato et al 2009).…”

Section: Introductionmentioning

confidence: 93%

“…Furthermore, we analyzed the floral integrator FLOWER-ING LOCUS T (FT) gene (Corbesier et al 2007) and its homologs to investigate the molecular mechanism of flowering control by light quality. We used Gypsophila paniculata, which is a long-day plant used as a major cut flower (Shillo and Halevy 1982;Kikuchi et al 2000), and Arabidopsis to investigate divergent flowering responses to light quality.…”

Section: Introductionmentioning

confidence: 99%

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Flowering and expression of flowering-related genes under long-day conditions with light-emitting diodes

Hori

Nishidate

Nishiyama

et al. 2011

Planta

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The effects of light quality on flowering time were investigated in Gypsophila paniculata, which is a long-day cut flower, and with Arabidopsis under long-day conditions with light-emitting diodes (LEDs). Gypsophila paniculata plants were grown under natural daylight and flowering was controlled by long-day treatment with a weak LED light of a single color in the night. Flowering was promoted not by blue light, but by far-red light in G. paniculata, while flowering was promoted by both light colors in Arabidopsis. FT homologs of G. paniculata GpFT1 and GpFT2 were differentially expressed under long-day conditions with white light, suggesting that they play roles in flowering at different stages of reproductive development. GpFTs and FT gene expression was not induced by far-red light in G. paniculata or Arabidopsis. Instead, the expression of the SOC1 homolog of G. paniculata GpSOC1 and SOC1 was induced by far-red light in G. paniculata and Arabidopsis. Flowering was promoted by induction of FT and SOC1 expression with blue light in Arabidopsis, whereas GpFTs and GpSOC1 expression was low with blue light induction in G. paniculata. The relationship between flowering and the expression of FT and SOC1 in Arabidopsis was confirmed with ft and soc1 mutants. These results suggest that long-day conditions with far-red light promote flowering through SOC1 and its homologs, while the conditions with blue light do not promote flowering in G. paniculata, because of low expression of GpFTs and GpSOC1 in contrast to that in Arabidopsis.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

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Flowering and expression of flowering-related genes under long-day conditions with light-emitting diodes

Hori

Nishidate

Nishiyama

et al. 2011

Planta

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“…Delphinium is popular as one of the few blue flowers, and artificial light for long-day treatment is necessary to promote flowering and improve cut flower quality under short-day conditions ( Kikuchi et al, 2000;2003). In Delphinium elatum, flowering is reportedly accelerated under long days and high-temperature conditions ( Katsutani and Ikeda, 1997).…”

Section: Introductionmentioning

confidence: 99%

Effect of light quality of long-day treatments on flowering in <i>Delphinium</i>

Sugawara

Numazawa

Abe

et al. 2023

J. Agric. Meteorol.

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The effects of light quality on the flowering need to be investigated for the efficient use of light-emitting diodes (LEDs) in cut flower production because of the environmentally friendly features of LEDs. Assuming long-day treatments in cut flower production, we used Delphinium species, popular long-day plants, and treated the plants at night with relatively weak light to investigate the effects of light quality. We used reproductive experimental conditions with phytotrons and long-day treatments, mainly monochromatic light, to establish an experimental system to elucidate physiological and molecular mechanisms in the near future. Before investigating the effect of monochromatic light, we first performed a long-day treatment with a widely used white LED. A similar effect to the incandescent lamp on bolting was observed, suggesting the possibility that red or blue light, but not far-red light, are adequate to promote flowering from the spectra of both light sources. Next, long-day treatments were performed with LEDs emitting monochromatic blue, red, and far-red light. In the model plant Arabidopsis thaliana, flowering is well known to be promoted by far-red and blue light and inhibited by red light. However, long-day treatment with red light for Delphinium effectively promoted flowering. Treatment with far-red light, which shows an opposite flowering response to red light in A. thaliana, also promoted the flowering of Delphinium. As for blue light, the flower budding rate of D. grandiflorum reached 100%, and that of D. elatum was lower. Compared to far-red and blue lights, long-day treatment with red light did not negatively impact cut flower quality, including cut flower length and number of florets. Our results on light quality impact on flowering response will contribute to technology for regulating Delphinium flowering and potentially also lead to the elucidation of the mechanism of unique flowering promotion by red light.

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“…We used Baby's Breath (G. paniculata) in this study because it is often used in flower arrangements and is an important long-day cut flower (Kikuchi et al, 2000;Shillo and Halevy, 1982). G. paniculata is grown by lighting culture for yearround production and shows a clear flowering response to long-day treatment as a qualitative long-day plant (Hori et al, 2011;Nishidate et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Characterization of Flowering-related Genes and Flowering Response in Relation to Blue Light in <i>Gypsophila paniculata</i>

et al. 2017

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The flowering response to monochromatic light and flowering-related genes underlying this response need to be characterized to efficiently use light-emitting diodes for lighting culture. The flowering response to far-red light has been well studied in long-day cut flowers, but there have been few studies investigating the response to blue light. Flowering and the expression of the G. paniculata homologs of the FLOWERING LOCUS T and SUPPRESSOR OF OVEREXPRESSION OF CONSTANS 1 genes (GpFT, GpSOC1) were not previously promoted in Gypsophila paniculata, an important long-day cut flower, 'Bristol Fairy' under long-day conditions with blue light. In the present study, we found that flowering was promoted in another G. paniculata 'Million Star', under long-day conditions with blue light, suggesting that there is variation in G. paniculata's flowering response to blue light. Therefore, we analyzed the expression of GpFT and GpSOC1 in the 'Million Star'. The expression of GpFT and GpSOC1 was promoted with flowering in 'Million Star' under long-day conditions with blue light in contrast to 'Bristol Fairy'. We next analyzed the G. paniculata homologs (GpFKF1, GpGI) of FLAVIN-BINDING KELCH REPEAT F-BOX 1 and GIGANTEA genes, which participate in the flowering response to blue light. GpFKF1 and GpGI amino acid sequences were well conserved; gene expression showed a diurnal rhythm with different peaks under short-day and long-day conditions, as previously observed in Arabidopsis thaliana. GpFKF1 interacted with GpGI. There were no important differences in GpFKF1 or GpGI amino acid sequences between the two cultivars. Our results suggest that variation in the flowering response to blue light is associated with GpFT and GpSOC1, rather than GpFKF1 and GpGI.

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Effect of Seedling Age, Photoperiod, and Temperature on Bolting and Inflorescence Quality in Delphinium.

Cited by 8 publications

References 7 publications

Flowering and expression of flowering-related genes under long-day conditions with light-emitting diodes

Flowering and expression of flowering-related genes under long-day conditions with light-emitting diodes

Effect of light quality of long-day treatments on flowering in <i>Delphinium</i>

Characterization of Flowering-related Genes and Flowering Response in Relation to Blue Light in <i>Gypsophila paniculata</i>

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