Effects of LEDs on net photosynthetic rate, growth and leaf stomata of chrysanthemum plantlets in vitro

Kim, Sun-Ja; Hahn, Eun-Joo; Heo, Jun; Paek, Kee-Yoeup

doi:10.1016/j.scienta.2003.10.003

Cited by 383 publications

(297 citation statements)

References 28 publications

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“…Blue light, either alone or in combination with other types of visible radiation, is known to be a critical factor in the photomorphogenic response of plants (RAJAPAKSE et al, 1992;BROWN et al, 1995), and it has recently been reported (Kim et al, 2004) that there is a reduction in the net photosynthetic rate of plants submitted to blue and blue-far red light treatment.…”

Section: Resultsmentioning

confidence: 99%

“…Such alterations are mediated by pigments, known as phytochromes, which have absorption peaks in the red and blue/ultraviolet regions of the spectrum (LI et al, 2000). These photoreceptors are able to detect variations in light composition and induce photomorphogenetic responses, either in vivo or in vitro (KIM et al, 2004;MACEDO et al, 2004) that influence growth and development (LEE et al, 1997;LI et al, 2000), morphology (STUEFER and HUBER, 1998), leaf and stem anatomy (SCHUERGER et al, 1997;LEE et al, 2000), distribution of photosynthetic products (KASPERBBAUER, 1987;BROWN et al, 1995), photosynthetic efficiency (KASPERBBAUER and PEASLEE, 1973) and chemical composition (MACEDO et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

“…However, whilst the effects of light quality on plants are well known, the response of different species to light management is variable (KIM et al, 2004), and it is clearly important to treat plants with the correct type of light filters (MCMAHON and KELLY, 1995), especially medicinal plants with economical interests.…”

Section: Introductionmentioning

confidence: 99%

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Effects of coloured shade netting on the vegetative development and leaf structure of Ocimum selloi

et al. 2010

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The objective of this work was to investigate the effects of shading on the growth and development of the medicinal plant Ocimum selloi after 90 days. Seedlings were maintained under three different light treatments, namely, full sunlight vs coloured shade treatments provided by red and blue ChromatiNet ® 50% coloured netting. After 90 days of cultivation, height, stem diameter, petiole length, total leaf area (TLA), specific leaf area (SLA), leaf area ratio (LAR) and leaf weight ratio (LWR) of each plant hare measured. Microscopic examination of leaf sections were conducted in order to determine the leaf blade thicknesses, together with the size and density of the stomata, the number and area of chloroplasts, and chloroplast starch grains present in the palisade parenchyma cells. Although coloured shade-grown plants were taller in comparison with those grown in full sunlight, total dry biomass together with root, stem and leaf tissue biomasses were lower. Plants exhibited phenotypic plasticity, as demonstrated by the different TLA, SLA, LAR and LWR values that were recorded under the various light treatments. Stomatal density and leaf thickness was increased in plants maintained in full sunlight owing to the expansion of the abaxial epidermis and the spongy parenchyma. Chloroplasts were more numerous and larger in plants grown under shading, whilst the accumulation of chloroplastic starch grains was greater in plants grown under red shading or in full sunlight.Key words: light quality and intensity; plastic coloured netting; plant anatomy; leaf morphology and structure. RESUMO EFEITO DO SOMBREAMENTO COM TELAS COLORIDAS NO DESENVOLVIMENTO VEGETATIVO E ESTRUTURA FOLIAR DE Ocimum selloiO objetivo deste trabalho foi verificar o efeito do sombreamento de Ocimum selloi com telas coloridas do tipo Cromatinet ® (50%) vermelha, azul e a condição natural de pleno sol (sem tela) sobre as características biométricas, fisiológicas, anatômicas e ultraestruturais da planta após 90 dias. As plantas nas telas coloridas tiveram maior crescimento em altura, mas o maior acúmulo de biomassa seca total e particionada e relação raiz: parte aérea (R:PA) ocorreram na condição de pleno sol. A espécie proporcionou plasticidade fenotípica, verificada pelos ajustes das variáveis área foliar total (AFT), área foliar específica (AFE), razão de área foliar (RAF) e razão de massa foliar (RPF) em função dos tratamentos. Ocorreu maior espessamento foliar na condição de pleno sol pelo somatório do maior espessamento da epiderme abaxial e do parênquima esponjoso. A densidade estomática foi maior nas plantas a pleno sol. O número de cloroplastos e seu tamanho foi maior nas telas coloridas, enquanto o maior acúmulo de amido ocorreu a pleno sol e tela vermelha.Palavras-chave: planta medicinal, telas coloridas, qualidade de luz, ultraestrutura foliar.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effects of coloured shade netting on the vegetative development and leaf structure of Ocimum selloi

et al. 2010

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“…A utilização dos LED na propagação in vitro foi avaliada nos cultivos de orquídea Cymbidium (Huan & Tanaka, 2004), morango (Fragaria vesca L.) (Rocha et al, 2010) e crisântemo (Chrysanthemum) (Kim et al, 2004), com resultados expressivos na qualidade da muda produzida e maior eficiência no processo produtivo. Na avaliação de diferentes combinações de LED vermelho e azul, no cultivo in vitro de morango, Nhut et al (2003) relataram o alto custo do LED azul, que inviabilizaria o uso dessa fonte no cultivo comercial de mudas in vitro.…”

Section: In Vitro Culture Of Sugarcane Exposed To Different Light Souunclassified

“…Na avaliação de diferentes combinações de LED vermelho e azul, no cultivo in vitro de morango, Nhut et al (2003) relataram o alto custo do LED azul, que inviabilizaria o uso dessa fonte no cultivo comercial de mudas in vitro. Alterações do número de estômatos nas folhas de crisântemo foram observadas com diferentes combinações de LED, o que levou à conclusão de que o ajuste e a escolha da fonte desse tipo de luz são importantes para o sistema de iluminação artificial, no cultivo in vitro (Kim et al, 2004).…”

Section: In Vitro Culture Of Sugarcane Exposed To Different Light Souunclassified

Cultivo in vitro de cana-de-açúcar exposta a diferentes fontes de luz

Maluta

Bordignon

Rossi

et al. 2013

Pesq. agropec. bras.

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Resumo -O objetivo deste trabalho foi avaliar o efeito de diferentes comprimentos de onda no desenvolvimento in vitro de mudas de cana-de-açúcar. Explantes foram submetidos a quatro tratamentos de diodos emissores de luz (LED): 100% azul; 70% azul + 30% vermelha; 30% azul + 70% vermelha; 100% vermelha, além do controle com lâmpada fluorescente branca. As plântulas foram avaliadas quanto a: número de brotações; altura; massa de matéria fresca e seca; e conteúdo de carotenoides e das clorofilas a e b. Observou-se desmanche dos tilacoides nos cloroplastos, proporcional ao aumento na incidência de luz vermelha. O porte das mudas diminui com o aumento na incidência de luz vermelha.Termos para indexação: Saccharum officinarum, biorreator de imersão temporária, cloroplastos, micropropagação, LED. In vitro culture of sugarcane exposed to different light sourcesAbstract -The objective of this work was to evaluate the effect of different wave length on the in vitro development of sugarcane seedlings. Explants were subjected to four light emitting diodes (LED): 100% blue; 70% blue + 30% red; 30% blue + 70% red; 100% red, besides the control with white fluorescent lamp. Seedlings were evaluated for: number of shoots; height; fresh and dry matter mass; and contents of carotenoids and chlorophyll a and b. It was observed thylakoid disarrangement in the chloroplast, proportional to the increasing incidence of red light. The size of the in vitro produced seedlings reduces with the increase of red light incidence.

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