Growth Control of the Sunflower (Helianthus annuus L. cv. Russian Mammoth) Seedlings by Additional Far-red Irradiation.

Murakami, Katsusuke; Horaguchi, Kimitoshi; Morita, Masaaki; Aiga, Ichiro

doi:10.2525/ecb1963.29.73

Cited by 11 publications

(5 citation statements)

References 8 publications

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“…On the other hand, lower attractiveness of FL cucumber seedlings is probably due to the inverse morphologic responses (i.e., increased leaf thickness and chlorophyll content and reduced shoot elongation) of the FL seedlings to those typical of shade avoidance, by the higher-than-natural R:FR ratio. Generally, low R:FR light is advantageous for improving the growth of plants because plants grow faster at low R:FR ratio (Murakami et al, 1991;Pausch et al, 1991;Shibuya et al, 2010), as we also observed in this study. On the other hand, the attractiveness of FL (higher R:FR ratio) cucumber seedlings to the SPWF adults was lower when compared with that of ML (lower R:FR ratio) seedlings, although the growth rate in the former was lower.…”

Section: Resultssupporting

confidence: 84%

“…The reduced shoot elongation is due to the high R:FR ratio of typical commercial FLs, which emit little FR irradiation. Thus, increasing the FR content of the light from these lamps can improve the elongation of plant shoots (Murakami et al, 1991;Shibuya et al, 2010). In natural environments, a reduction in the R:FR ratio resulting from the absorption of red light by neighboring vegetation increases shoot elongation and leaf expansion and reduces leaf thickness and chlorophyll content (Franklin, 2008;Smith and Whitelam, 1997).…”

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confidence: 99%

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Preference of Sweetpotato Whitefly Adults to Cucumber Seedlings Grown under Two Different Light Sources

Shibuya¹,

Komuro²,

Hirai³

et al. 2010

hortte

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We evaluated the preference of adult sweetpotato whitefly [SPWF (Bemisia tabaci biotype B)] to cucumber (Cucumis sativus) seedlings grown under fluorescent lamps (FLs) or metal-halide lamps (MLs) that provided a spectrum similar to that of natural light. Cucumber seedlings were grown under FLs or MLs at a photosynthetic photon flux of 350 μmol·m−2·s−1 in a 12/12-hour light/dark cycle. The red:far red (R:FR) ratio of FL was 7.0 and that of ML was 1.2. Pairs of cucumber seedlings, one grown under FLs and the other under MLs, were then placed in cages and about 100 SPWF adults were released. There were significantly fewer SPWF adults on the FL cucumber seedlings (36%) than on the ML seedlings (64%) 24 hours after release. FL cucumber seedlings had higher chlorophyll content and thicker leaves than ML seedlings. The lower attractiveness of the FL cucumber seedlings was probably due to changes in morphologic characteristics such as the leaf color and thickness resulting from high R:FR illumination of FL. The fact that light quality affects the plant attractiveness to herbivores should be considered in selecting light sources for transplant production under artificial light.

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Section: Resultssupporting

confidence: 84%

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confidence: 99%

Preference of Sweetpotato Whitefly Adults to Cucumber Seedlings Grown under Two Different Light Sources

Shibuya¹,

Komuro²,

Hirai³

et al. 2010

hortte

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“…those of ML and FL L seedlings. Illumination with low R:FR light is advantageous for improving the growth of seedlings because plants often grow faster at lower R:FR (Murakami et al, 1991;Pausch et al, 1991), as we also observed here. On the other hand, the photosynthetic efficiency in FL H seedlings was greater than that in FL L seedlings at high PPFDs, although the growth rate in the former was lower.…”

Section: Discussionsupporting

confidence: 82%

“…The reduced shoot elongation seems to be the result of the high red to far-red ratios (R:FR) of typical commercial fluorescent lamps, which emit little FR irradiance. Elongation of plant shoots could be improved by increasing the FR content of the light from these lamps (Murakami et al, 1991). In natural ecosystems, shoot elongation and leaf expansion are increased and leaf thickness and chlorophyll content reduced by a reduction in the R:FR resulting from absorption of red irradiation by neighboring vegetation (Smith and Whitelam, 1997).…”

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confidence: 99%

Potential Photosynthetic Advantages of Cucumber (Cucumis sativus L.) Seedlings Grown under Fluorescent Lamps with High Red:far-red Light

Shibuya¹,

Endo²,

Kitamura³

et al. 2010

horts

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To evaluate the effect of fluorescent lamps with a high red:far-red (R:FR) light on the potential photosynthesis of transplants, we investigated the photosynthetic light responses of cucumber (Cucumis sativus L.) seedlings grown under fluorescent lamps with high R:FR light (FLH) and compared them with the responses of the seedlings grown under metal-halide lamps (ML) that provided a spectrum similar to that of natural light and under a fluorescent lamp with low R:FR light (FLL). The seedlings were grown under FLH (R:FR = 7.0), ML (R:FR = 1.2), or FLL (R:FR = 1.1) at a photosynthetic photon flux density (PPFD) of 350 μmol·m−2·s−1. The gross photosynthetic rate (Pg), quantum yield of photosystem II (ΦPSII), and photosynthetic electron transfer rate (ETR) of the foliage leaves were then evaluated at PPFDs ranging from 0 to 1000 μmol·m−2·s−1. The photosynthetic light response of FLH seedlings was similar to those of sun leaves, and the responses of ML and FLL seedlings were similar to those of shade leaves. The Pg, ETR, and ΦPSII of FLH seedlings at PPFD of 1000 μmol·m−2·s−1 was 1.38, 1.32, and 1.28 times, respectively, those of ML seedlings, and was 1.40, 1.23, and 1.22 times, respectively, those of FLL seedlings. The Pg was closely correlated with ETR in each treatment. FLH seedlings had thicker leaf and greater chlorophyll content per leaf area than ML and FLL seedlings. The greater Pg of FLH seedlings than in the other two groups of seedlings at high PPFD was probably the result of the improved ETR resulting from physiological and morphological changes in response to the high R:FR light.

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“…Plants grown under typical commercial fluorescent lamps have unusual morphological characteristics, such as shorter shoots, thicker leaves, and deeper leaf color than those grown under normal-spectrum lights (e.g., Hogewoning et al 2010, Shibuya et al 2010a, 2010b, 2011. These morphological characteristics result from the high red:far-red (R:FR) ratios of typical commercial fluorescent lamps, which emit little FR radiation, because these morphological characteristics can be normalized by increasing the FR content of the light from these lamps (Deutch and Rasmussen 1974, Murakami et al 1991, Shibuya et al 2010a, 2011. The use of illumination with a high R:FR ratio also often suppresses quantitative aspects of plant growth, including shoot elongation, leaf expansion, and consequent biomass production (Li and Kubota 2009, Hogewoning et al 2010, Shibuya et al 2010a.…”

Section: Introductionmentioning

confidence: 99%

High-light-like photosynthetic responses of Cucumis sativus leaves acclimated to fluorescent illumination with a high red:far-red ratio: interaction between light quality and quantity

Shibuya¹,

Endo²,

Hayashi³

et al. 2012

Photosynt.

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This study evaluated the photosynthetic responses of Cucumis sativus leaves acclimated to illumination from three-band white fluorescent lamps with a high red:far-red (R:FR) ratio (R:FR = 10.5) and the photosynthetic responses of leaves acclimated to metal-halide lamps that provided a spectrum similar to that of natural light (R:FR = 1.2) at acclimation photosynthetic photon flux density (PPFD) of 100 to 700 µmol m -2 s -1 . The maximum gross photosynthetic rate (P G ) of the fluorescent-acclimated leaves was approximately 1.4 times that of the metal-halide-acclimated leaves at all acclimation PPFDs. The ratio of quantum efficiency of photosystem II (Ф PSII ) of the fluorescent-acclimated leaves to that of the metal-halide-acclimated leaves tended to increase with increasing acclimation PPFD, whereas the corresponding ratios for the leaf mass per unit area tended to decrease with increasing acclimation PPFD. These results suggest that the greater maximum P G of the fluorescent-acclimated leaves resulted from an interaction between the acclimation light quality and quantity, which was mainly caused by the greater leaf biomass for photosynthesis per area at low acclimation PPFDs and by the higher Ф PSII as a result of changes in characteristics and distribution of chloroplasts, or a combination of these factors at high acclimation PPFDs.

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Growth Control of the Sunflower (Helianthus annuus L. cv. Russian Mammoth) Seedlings by Additional Far-red Irradiation.

Cited by 11 publications

References 8 publications

Preference of Sweetpotato Whitefly Adults to Cucumber Seedlings Grown under Two Different Light Sources

Preference of Sweetpotato Whitefly Adults to Cucumber Seedlings Grown under Two Different Light Sources

Potential Photosynthetic Advantages of Cucumber (Cucumis sativus L.) Seedlings Grown under Fluorescent Lamps with High Red:far-red Light

High-light-like photosynthetic responses of Cucumis sativus leaves acclimated to fluorescent illumination with a high red:far-red ratio: interaction between light quality and quantity

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