Anatomia e ultraestrutura foliar de Ocimum gratissimum sob diferentes níveis de radiação luminosa

Fernandes, Valéria Ferreira; Bezerra, Laís de Almeida; Mielke, Marcelo Schramm; Silva, Delmira da Costa; Costa, Larissa Corrêa do Bomfim

doi:10.1590/s0103-84782014000600014

Cited by 13 publications

(5 citation statements)

References 17 publications

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“…intensity (Voltan et al 1992;Hanba et al 2002;Lima Jr. et al 2006;Fernandes et al 2014), with improved photosynthetic efficiency (Kim et al 2005). According to Hazarika (2006), the delicate structure of plants developed in vitro makes them more vulnerable when exposed to ex vitro conditions.…”

Section: Discussionmentioning

confidence: 99%

“…Little appressed thylakoid membranes are typical of chloroplasts exposed to high light intensity (Yano & Terashima 2001;Fernandes et al 2014). The less appressed arrangement of thylakoid membranes in the chloroplasts of plants grown in the greenhouse may be associated with the formation of large starch grains which are due to high light exposure.…”

Section: Discussionmentioning

confidence: 99%

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Influence of test tube sealing on the morpho-anatomy and ultrastructure of leaves of Aechmea bromeliifolia (Bromeliaceae) grown in vitro

et al. 2020

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In vitro grown plants may have abnormal structural and physiological features. However, the type of the sealing material used in tissue culture may minimize such abnormalities. This study evaluates the influence of the type of sealing of test tubes on the anatomical and ultrastructural features of leaves of Aechemea bromeliifolia (Rudge) Baker (Bromeliaceae), an ornamental bromeliad native to Brazil, grown in vitro. Three types of sealing were used: rigid polypropylene cap (PC), polyvinyl chloride film (PVC), and PC coupled with a microporous membrane (PM). Seedlings germinated in a greenhouse were also studied for comparison. Plants grown in test tubes sealed with PM were more similar to those from the greenhouse, as far as the pattern of stomatal opening, the presence of starch grains, and the organization of the internal membrane system of the chloroplasts is concerned. Plants cultivated in test tubes sealed with PC had higher stomatal density and the chloroplasts had large areas without thylakoids in the stroma. Plants grown in test tubes sealed with PVC had few or no starch grains. These results suggest that microporous membrane used coupled with PC sealing provided natural ventilation, thus contributing to a better plant development.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Influence of test tube sealing on the morpho-anatomy and ultrastructure of leaves of Aechmea bromeliifolia (Bromeliaceae) grown in vitro

et al. 2020

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“…Essas variações estruturais estão relacionadas com a regulação da radiação luminosa e a difusão de CO 2 , proporcionando maior eficiência fotossintética à planta (Flexas et al, 2012). Assim, nas folhas de a pleno sol o mesofilo é mais espesso, compacto, com espaços intercelulares reduzidos (Fernandes et al, 2014). O aumento da espessura foliar em plantas expostas a condições de sol pleno é uma característica de proteção dos fotossistemas (Niinemets et al, 1998).…”

Section: Resultsunclassified

Morfoanatomia foliar de azevém no sub-bosque de espécies arbóreas em sistemas agroflorestais

et al. 2017

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Morfoanatomia foliar de azevém no sub-bosque de espécies arbóreas em sistemas agroflorestaisA verificação das modificações que ocorrem na planta, em função da aclimatação ao sombreamento, auxilia na seleção de espécies forrageiras adequadas para o uso em sistemas agroflorestais. O objetivo deste estudo foi avaliar a morfoanatomia foliar de azevém (Lolium multiflorum Lam.), no sub-bosque de espécies arbóreas em sistemas agroflorestais. O experimento foi conduzido no município de Frederico Westphalen, RS, entre junho e setembro de 2012, em delineamento experimental de blocos ao acaso. O azevém anual foi semeado em três ambientes: radiação solar plena, sub-bosque de angico-vermelho (Parapiptadenia rigida Benth.) e canafístula (Peltophorum dubium Spr. Taubert), com três repetições. As espécies florestais foram distribuídas em cinco renques, separados por 6,0 m cada. Foram avaliadas as seguintes variáveis: radiação fotossinteticamente ativa incidente (RFAi), transmissividade da RFAi, área foliar específica, espessura do mesofilo foliar, espessura da parede periclinal externa mais cutícula, tamanho do estômato e densidade estomática. A presença das espécies florestais provoca alterações nas condições luminosas do ambiente de produção do azevém e ocasiona ajustes nas folhas dessa espécie, os quais resultam no aumento da área foliar específica, na diminuição do mesofilo e na espessura da parede periclinal externa mais cutícula, bem como no aumento da quantidade e tamanho dos estômatos. Esses ajustes resultam da capacidade de aclimatação do azevém, que nas condições de baixa luminosidade, altera sua morfologia em busca de radiação solar e aumenta a área fotossintética. Palavras Leaf morphoanatomy of ryegrass in the tree species understory in agroforestry systemsThe verification of changes that occur in the plant, due to the acclimatization to the shading, assists in the selection of forage species suitable for use in agroforestry systems. The aim of this study was to evaluate the leaf morphoanatomy of ryegrass (Lolium multiflorum Lam.) in the tree species understory in agroforestry systems. The experiment was conducted in Frederico Westphalen, RS, Brazil, between June and September 2012, in an experimental design of randomized blocks. The annual ryegrass was sown in three environments: full sunlight, understory of angico-vermelho (Parapiptadenia rigida Benth.), and canafístula (Peltophorum dubium Spr. Taubert), with three replications. Forest species were distributed in five lines, separated by 6.0 m. The following variables were evaluated: incident photosynthetically active radiation (RFAi), transmissivity of RFAi, specific leaf area, leaf mesophyll thickness, thickness of outer periclinal wall + cuticle, stomatal size, and stomatal density. The presence of forest species causes changes in the lighting conditions of the production environment of ryegrass and causes adjustments in the leaves of this species, which result in increased specific leaf area, decreased mesophyll and thickness of the outer periclinal wall + cu...

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“…In this sense, the mean leaf size of individuals of E. uniflora sampled at the urban site exhibited greater variation than those of the forest site, where some leaves present a more development of the second layer of the palisade parenchyma and shortening of the spongy parenchyma. Variation in the thickness of the palisade parenchyma is usually related to responses of light radiation (Fernandes et al 2014). According to Khosropour et al (2018), the proportion of mesophyll tissue in plants in an urban environment is influenced by chloroplasts used in photosynthesis located in the palisade parenchyma.…”

Section: Discussionmentioning

confidence: 99%

Does an urban environment affect leaf structure of Eugenia uniflora L. (Myrtaceae)?

2020

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External factors can interfere with the structure and biological activity of plants. Nevertheless, the susceptibility of plants to specific environmental conditions varies, which raises many questions about the behavior of medicinal plants when grown in urban areas. This study aims to detect possible changes induced by exposure of Eugenia uniflora L. to an urban environment, with emphasis on variation in external and internal leaf structure and differences in the production of its main metabolites. We compared leaves of E. uniflora cultivated in forest and urban sites and analyzed them for structural plasticity and characteristics indicative of stress in the urban environment. The leaves of the urban site revealed necrosis and reddish spots, higher stomatal density, smaller stomata and more numerous crystals and secretory glands, as well as evident storage of starch, lipids, and mucilage. The presence of numerous crystals had a high plasticity index and great potential as anatomical marker for evaluating the effects of the urban environment. Visual symptoms and anatomical changes were efficient at diagnosing stress in E. uniflora, while characteristics of the urban site, such as temperature, heat and pollution, are thought to be responsible for the observed variation and may influence your medicinal characteristic.

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Anatomia e ultraestrutura foliar de Ocimum gratissimum sob diferentes níveis de radiação luminosa

Abstract: RESUMO Espécies vegetais são capazes de ajustar suas características fi siológicas, anatômicas e ultraestruturais aos fatores ambientais

Cited by 13 publications

References 17 publications

Influence of test tube sealing on the morpho-anatomy and ultrastructure of leaves of Aechmea bromeliifolia (Bromeliaceae) grown in vitro

Influence of test tube sealing on the morpho-anatomy and ultrastructure of leaves of Aechmea bromeliifolia (Bromeliaceae) grown in vitro

Morfoanatomia foliar de azevém no sub-bosque de espécies arbóreas em sistemas agroflorestais

Does an urban environment affect leaf structure of Eugenia uniflora L. (Myrtaceae)?

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