Effects of Light Quality on Seed Germination and Seedling Growth of Cattleya Orchids in vitro.

Islam, O. M.; Matsui, S.; Ichihashi, Syoichi

doi:10.2503/jjshs.68.1132

Cited by 20 publications

(17 citation statements)

References 13 publications

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“…Accordingly, exposure to blue light, in contrast to control white light, resulted in plantlets with a greater number of nodes and induced the greatest elongation of P. tenellus shoots. However, this response is not in agreement with the results of previous researchers who have verified that blue light may either inhibit or increase stem elongation (Islam et al, 1999;Shimizu et al, 2005). We found that exposure to yellow light increased stem elongation, a finding which agrees with studies using Cattleya walkeriana (Islam et al, 1999).…”

Section: Discussioncontrasting

confidence: 90%

“…However, this response is not in agreement with the results of previous researchers who have verified that blue light may either inhibit or increase stem elongation (Islam et al, 1999;Shimizu et al, 2005). We found that exposure to yellow light increased stem elongation, a finding which agrees with studies using Cattleya walkeriana (Islam et al, 1999). Also, according to Maas et al (1995), changes in shoot elongation in response to blue and red light result primarily from cell wall extension, confirming the effects of yellow light, as shown in our study.…”

Section: Discussioncontrasting

confidence: 90%

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Light spectra affect the morphoanatomical and chemical features of clonal Phyllanthus tenellus Roxb. grown in vitro

Cristiane¹,

Marcos²,

Eliana³

et al. 2015

J. Med. Plants Res.

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Phyllanthus tenellus Roxb. is a widely distributed tropical medicinal plant and highly valued for its therapeutic properties. Since variable light conditions can significantly alter phenolic compounds that are the main therapeutic constituents of P. tenellus, including tannins and flavonoids, the development of this plant and its chemical metabolism in response to different light spectra were investigated. To accomplish this, P. tenellus was cultured in modified Murashige and Skoog (MS) medium for 60 days, and its development, leaf anatomy and phytochemistry were analyzed after exposure to white, red, green, yellow and blue light, as well as darkness. Compared to white light, the best in vitro morphogenic responses, including rooting percentage, shoot height, number of leaves, and number and length of branches, occurred under exposure to blue and yellow light. Plantlets developed under white and blue lights presented the greatest thickness of palisade and spongy parenchymas. Under dark condition, plantlets showed fragile aspect and the lowest thickness of leaf tissues. In contrast to other light treatments, chlorophyll and carotenoid contents were significantly lower in plants maintained under green light, whereas yellow light improved the production of phenolic compounds. These results highlight the influence of different light spectra on morphoanatomical features and suggest how different light spectra affect secondary metabolite production in the context of preserving this plant's therapeutic integrity.

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Section: Discussioncontrasting

confidence: 90%

Section: Discussioncontrasting

confidence: 90%

Light spectra affect the morphoanatomical and chemical features of clonal Phyllanthus tenellus Roxb. grown in vitro

Cristiane¹,

Marcos²,

Eliana³

et al. 2015

J. Med. Plants Res.

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“…Often, there is variability among responses to light quality across the plant scale: for example, maximal photochemical efficiency and quantum yield of PSII of leaves growing under blue light was significantly higher than under control light, whilst biomass under blue light was significantly lower than under control light (Su et al 2014). Furthermore, responses are often species-specific; monochromatic blue light enhanced germination in orchids Cattleya walkeriana but not in Amaranthus caudatus seeds (Nowak et al 1996, Islam et al 1999 (Fig. 1).…”

Section: Introductionmentioning

confidence: 99%

Seagrass Halophila ovalis is affected by light quality across different life history stages

Strydom¹,

McMahon²,

Kendrick³

et al. 2017

Mar. Ecol. Prog. Ser.

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Seagrass meadows provide crucial ecosystem services to the coastal zone but are threatened globally. Seagrass loss to date has mainly been attributed to anthropogenic activities that reduce light quantity (amount of photosynthetic photon flux density), such as dredging, flooding and eutrophication. However, light quality (wavelengths of light within the visible spectrum) is also altered by these anthropogenic stressors. This study addressed the effect of light quality changes on seagrasses. Aquarium-based experiments were conducted to determine whether the seagrass Halophila ovalis (R.Br.) Hook f. responds to different light quality treatments. Separate experiments were performed in which adults, seeds or seedlings were subjected to monochromatic light treatments in the blue (peak λ = 451 nm), green (peak λ = 522 nm), yellow (peak λ = 596 nm) and red (peak λ = 673 nm) wavelengths with a control of full-spectrum light (λ = 400 − 700 nm, at 200 µmol photons m −2 s −1). This study is unique in that it measured seagrass responses to light across several plant scales (physiology, productivity, morphology and biomass) as well as across life-history stages (seeds, seedlings, adults and flowering). Adult plants responded differently to seeds and seedlings but were generally consistent with terrestrial angiosperms: blue light decreased below-ground productivity; green light influenced morphology (through increased rhizome internode length); red light enhanced seed germination and survival. The findings indicate that both natural and human-induced changes in light quality could significantly affect seagrass growth and reproduction. As a range of anthropogenic activities are currently contributing to the global losses of seagrasses, this research provides timely information on how light quality influences different seagrass life history stages.

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“…It should be noted that works evaluating green light on plant development have only just emerged in the literature (Islam et al, 1999). However, in this study, it was found that germination percentage under green light was significantly smaller than white light, in MS0 (Figure 2A).…”

Section: Resultsmentioning

confidence: 37%

“…However, in this study, it was found that germination percentage under green light was significantly smaller than white light, in MS0 (Figure 2A). Islam et al (1999) also reported low in vitro germination of Cattleya walkeriana under green light. This kind of light is used as security light in germination experiments.…”

Section: Resultsmentioning

confidence: 99%

The influence of light spectra, UV-A, and growth regulators on the in vitro seed germination of Senecio cineraria DC.

et al. 2010

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RESUMO Germinação in vitro de sementes de Senecio cineraria DC.: Efeitos de espectros de luz, UV-A e reguladores de crescimentoEste estudo foi conduzido para investigar os efeitos dos espectros de luz, adição de UV-A, e diferentes concentrações reguladores de crescimento sobre a germinação in vitro de Senecio cineraria DC. As sementes foram desinfestadas e inoculadas em meio MS para avaliação das seguintes qualidades de luz: branca, branca acrescida de UV-A, azul, verde, vermelha ou ausência de luz. A maior germinabilidade foi obtida usando meio MS0 sob luz branca (30%) e MS + 0,3 mg L -1 de AG 3 no escuro (30,5%). Sementes de S. cineraria foram indiferentes à luz para germinar. As luzes azul e verde inibiram a germinação. Diferentes concentrações de ácido giberélico (AG 3 ) (0,1; 0,4; 0,6; 0,8; 1,0 e 2,0 mg L -1 ) e ácido indolacético (AIA) (0,1; 0,3 e 1,0 mg L -1 ) foram avaliadas sob luz branca e no escuro. Sob luz branca, nenhuma concentração de AG 3 aumentou a taxa germinativa. As concentrações de AG 3 aprimoraram as respostas de germinação para as sementes mantidas no escuro, exceto na concentração de 1,0 mg L -1 . Essas concentrações também aumentaram o tempo médio e reduziram a velocidade de germinação. A taxa de germinação, sob condições de luz e no escuro, foi menor quando se utilizou AIA em comparação com AG 3 .Palavras-chave: Auxina, cultura de tecidos vegetais, espectros de luz, giberelina, ultravioleta-A. The influence of light spectra, UV-A, and growth regulators on the in vitro seed germination of Senecio cineraria DC.This study was carried out to investigate the effects of light spectra, additional UV-A, and different growth regulators on the in vitro germination of Senecio cineraria DC. Seeds were surface-sterilized and inoculated in MS medium to evaluate the following light spectra: white, white plus UV-A, blue, green, red or darkness. The maximum germinability was obtained using MS0 medium under white light (30%) and MS + 0.3 mg L -1 GA 3 in the absence of light (30.5%). S. cineraria seeds were indifferent to light. Blue and green lights inhibited germination. Different concentrations of gibberellic acid (GA 3 ) (0.1; 0.4; 0.6; 0.8; 1.0 and 2.0 mg L -1) and indole-3-acetic acid IAA (0.1; 0.3 and 1.0 mg L -1 ) were evaluated under white light and darkness. No concentration of GA 3 enhanced seed germination percentage under white light. However, when the seeds were maintained in darkness, GA 3 improved germination responses in all tested concentrations, except at 1.0 mg L -1 . Under white light, these concentrations also increased the germination time and reduced germination rate. Germination rate, under light or darkness, was lower using IAA compared with GA 3 .

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Effects of Light Quality on Seed Germination and Seedling Growth of Cattleya Orchids in vitro.

Cited by 20 publications

References 13 publications

Light spectra affect the morphoanatomical and chemical features of clonal Phyllanthus tenellus Roxb. grown in vitro

Light spectra affect the morphoanatomical and chemical features of clonal Phyllanthus tenellus Roxb. grown in vitro

Seagrass Halophila ovalis is affected by light quality across different life history stages

The influence of light spectra, UV-A, and growth regulators on the in vitro seed germination of Senecio cineraria DC.

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