Red:far-red light ratio and far-red light integral promote or retard growth and flowering in Eustoma grandiflorum (Raf.) Shinn

Yamada, Asuka; Tanigawa, Takahiro; Suyama, Takahito; Matsuno, Takatoshi; Kunitake, Toshihiro

doi:10.1016/j.scienta.2008.09.009

Cited by 42 publications

(30 citation statements)

References 24 publications

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“…This observation is consistent with the finding that using INC (with low R:FR ratio) as a light source for NI hastens flowering in petunia and Coreopsis grandiflora (Runkle et al, 2012). Sato et al (2009) and Yamada et al (2009aYamada et al ( , 2009b also showed that flowering in Eustoma is promoted when the R:FR ratio of the NI light source is low. In the current study, regression analysis between days to first flower and spectral factors (Table 4) We observed the flowering responses of petunia to growth under artificial light sources for 10 weeks (Table 3), finding that all plants grown under all light sources flowered, except FL tube, which induced flowering in only 20% of petunia plants.…”

Section: Effects Of Artificial Light Sources On Flowering Responsessupporting

confidence: 91%

“…NI lighting is used to create long days from autumn to spring by supplementing plants with low intensity (photosynthetic photon flux density, PPFD) 1-2 µmol·m -2 ·s -1 light during the middle of the night, such as 4-h NI treatment, i.e., providing light from 10 p.m. to 2 a.m. For some long-day plants (LDPs) such as petunia, the use of bulb-type FL (compact FL) for NI treatment delays flowering compared to INC because the ratio of red light to far-red light (R:FR ratio) in FL (approximately 8.46) is higher than that of INC (approximately 0.60) (Runkle et al, 2012). For Eustoma grandiflorum, an LDP, flowering is inversely proportional to the R:FR ratio of FL under NI (Sato et al, 2009), and the flower bud formation period is reduced under NI using a light source with a low R:FR ratio (Yamada et al, 2009a(Yamada et al, , 2009b. In addition, the bolting of spinach, another LDP, is promoted under NI treatment with high FR light (Hamamoto et al, 2004), and the use of lights with a low R:FR ratio promotes flowering in Matthiola incana (Yoshimura et al, 2002).…”

Section: Introductionmentioning

confidence: 99%

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Growth and Flowering Responses of Petunia to Various Artificial Light Sources with Different Light Qualities

Park¹,

Cho²,

Kim³

et al. 2016

HST

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This study was carried out to investigate the effect of artificial light sources with different light qualities on the growth and flowering characteristics of a herbaceous long-day plant, Petunia × hybrida Hort. Seedlings of petunia cultivar 'Madness Rose' were potted, acclimated for one week, and grown in a phytotron equipped with tube-and bulb-type fluorescent lamps (FL tube and bulb), tube-type white light-emitting diodes (LED tube), halogen lamps (HL), metal halide lamps (MH), and high pressure sodium lamps (HPS) for 10 weeks. The temperature, photoperiod, and photosynthetic photon flux density (PPFD) in the phytotron were 22 ± 2 ˳ C, 16 h, and 25 ± 2 µmol ㆍm -2 ㆍs -1 , respectively. Light sources combined with HL promoted stem elongation, and plant height and internode length decreased with increasing red to far-red (R:FR) ratio. FL tube + LED tube, HPS, and FL tube promoted branching, whereas plants grown under light sources combined with HL did not have any branches. Days to flowering (from longest to shortest) occurred as follows: FL tube + HL > FL tube + HL > MH > HPS = FL tube + FL bulb > FL tube + LED tube > LED tube > FL tube, indicating that reducing the R:FR ratio of the light sources promoted flowering. Only 20% of plants grown under an FL tube flowered, whereas under all other treatments, 100% of plants flowered. At 10 weeks after treatment, plants grown under HPS and MH had (cumulatively) 12 open flowers, and those grown under FL tube + FL bulb, LED tube, FL tube + LED tube, and HPS treatment had approximately seven flower buds. These results suggest that light sources with low R:FR ratios promote flowering and stem elongation in petunia, but they reduce its ornamental value due to overgrowth and poor branching.

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Section: Effects Of Artificial Light Sources On Flowering Responsessupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Growth and Flowering Responses of Petunia to Various Artificial Light Sources with Different Light Qualities

Park¹,

Cho²,

Kim³

et al. 2016

HST

View full text Add to dashboard Cite

show abstract

“…This implies that the effect of R/FR on lettuce growth varies depending on the growth stage. According to Yamada et al (2009), the budding and flowering time of Eustoma grandiflorum was different in various R/FR irradiation treatments. Meanwhile, R/FR 1.2 yielded the highest shoot and root growth at 22 days of treatment.…”

Section: Resultsmentioning

confidence: 99%

“…Increasing R/FR using photoselective film inhibited stem elongation in chrysanthemum and bell pepper seedlings (Li et al, 2000). In addition, short internode and delayed flowering resulted from a high R/FR by using several light sources in Eustoma grandiflorum (Yamada et al, 2009). Comparison of several different R/FR revealed that a relatively high R/FR delayed flowering and internode elongation, but a low R/FR by using incandescent lamps did not affect flowering and further inhibited internode length in pea plants (Cummings et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

Growth and cell division of lettuce plants under various ratios of red to far-red light-emitting diodes

Lee

Park

2015

Hortic. Environ. Biotechnol.

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We investigated the effects of various ratios of red to far-red light-emitting diodes (LEDs) on growth characteristics, physiological response, and cell division of red leaf lettuce. Sixteen-day-old lettuce seedlings were transferred into growth chambers and cultivated under various ratios of red (R) and far-red (FR) LEDs (R/FR = 0.7, 1.2, 4.1, and 8.6), only red LEDs (RED), or fluorescent lamps (control) for 22 days. Growth characteristics were measured at 11 and 22 days of treatment. In addition, cell division rate, epidermal cell density, chlorophyll fluorescence, and photosynthesis of leaves were analyzed. Fresh and dry weights and leaf area in all R/FR treatments were higher than those in the control at 22 days of treatment. The R/FR 1.2 had the highest values among R/FR treatments. The number of leaves appeared to increase as R/FR ratio increased. The specific leaf weights in the R/FR ratio of 0.7, 1.2, and 8.6 were similar to the control at 22 days of treatment. The SPAD values in all R/FR treatments were lower than that in the control. All R/FR treatments led to a longer leaf shape than the control. The percentage of cells in the G2M phase, indicating the cell division rate, increased in the R/FR treatments after 4 days of treatment, which supported the growth improvement in the R/FR treatments. The Fv/Fm and the photosynthetic rate in all treatments decreased due to the absence of blue light. The results of this study suggest that the supplementation with far-red LEDs should be considered when designing artificial lighting systems for closed-type plant factories since far-red light affects the vegetative growth of leafy vegetables such as lettuce.Additional key words: G2M phase, light quality, phytochromes, plant factory Hort.

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“…Long-day (LD) plants such as Lupinus (Cavins and Dole, 2001) and Eustoma (Yamada et al, 2009) naturally flower when the night length is less than a critical duration. Thus, LD plants can also flower under LD condition created by a supplemental lighting at night during a short-day (SD) period Oh et al, 2008;Runkle et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Photosynthetic changes in Cymbidium orchids grown under different intensities of night interruption lighting

Kim

Rho

et al. 2015

Scientia Horticulturae

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Red:far-red light ratio and far-red light integral promote or retard growth and flowering in Eustoma grandiflorum (Raf.) Shinn

Cited by 42 publications

References 24 publications

Growth and Flowering Responses of Petunia to Various Artificial Light Sources with Different Light Qualities

Growth and Flowering Responses of Petunia to Various Artificial Light Sources with Different Light Qualities

Growth and cell division of lettuce plants under various ratios of red to far-red light-emitting diodes

Photosynthetic changes in Cymbidium orchids grown under different intensities of night interruption lighting

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