Crescimento inicial de plantas de Cryptocaria aschersoniana Mez. submetidas a níveis de radiação solar

Almeida, Luciano Pessoa de; Alvarenga, Amauri Alves de; Castro, Evaristo Mauro de; Zanela, Silvia Mara; Vieira, Carlos Vinício

doi:10.1590/s0103-84782004000100013

Cited by 49 publications

(51 citation statements)

References 10 publications

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“…It should be noted that an increase in the level of chlorophyll a, which is more effective in capturing radiant energy for photosynthesis, provides an increase in electron transport in photosystems, resulting in the production of reactive oxygen species. According to Almeida et al (2004), plants that have higher chlorophyll levels are potentially capable of achieving higher photosynthesis rates and therefore adapt better to different environmental conditions. Acta bot.…”

Section: Resultsmentioning

confidence: 99%

Seed vigor, antioxidant metabolism and initial growth characteristics of red rice seedlings under different light intensities

et al. 2013

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This work aimed to evaluate the effect that different intensities of light have on the physiological attributes of red rice seeds and seedlings. Before and after emergence, seedlings were exposed to light levels of 35%; 65% and 100% in a greenhouse. We evaluated shoots and roots, in terms of length and dry mass, as well as leaf area and content of chlorophyll (a, b and total). In leaves and roots, we quantified the activity of superoxide dismutase (SOD), ascorbate peroxidase (APX), catalase (CAT) and guaiacol peroxidase (POX). We determined the leaf area ratio (F A ), leaf mass ratio (F W ), specific leaf area (S A ), and shoot/root ratio (P W ). At higher light intensities, shoot length decreased, whereas root length, dry mass and number of tillers increased. Leaf area was greatest in seedlings exposed to a 65% light level. The F A , F W , S A and P W were lowest at a light intensity of 100%. Differences in light intensity had qualitative and quantitative effects on chlorophyll contents. The activity of SOD and CAT was higher at lower light levels, whereas the inverse was true for APX and POX activity. Extremes of light availability alter the activity of antioxidant enzymes, negatively affecting the initial growth characteristics and photosynthetic pigments of red rice seedlings.

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Section: Resultsmentioning

confidence: 99%

Seed vigor, antioxidant metabolism and initial growth characteristics of red rice seedlings under different light intensities

et al. 2013

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“…This effect on the chlorophyll content is common for metal ion toxicity in plants. In this study, the copper had an inverse effect on the chlorophyll index, which is a widely used method for estimating the photosynthetic potential of plants because of the direct connection between the absorption and transfer of light energy, growth and adaptation to different environments (Almeida et al, 2004). Based on the association of the chlorophyll index values with the growth of plants in the presence of high doses of copper, it is possible that the increased concentration of this micronutrient enhanced the chlorophyll index values by decreasing the leaf area and the fresh and/or dried leaf tissue (data not shown) at the two evaluated time points, as shown by McMahon and Kelly (1990).…”

Section: Discussionmentioning

confidence: 98%

Chlorophyll Fluorescence Transient Analysis in Alternanthera tenella Colla Plants Grown in Nutrient Solution with Different Concentrations of Copper

Cuchiara¹,

Silva²,

Martinazzo³

et al. 2013

JAS

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This study evaluates the chlorophyll index and fluorescence parameters of chlorophyll a in Alternanthera tenella grown in different concentrations of copper (Cu). The A. tenella plants were hydroponically grown in a complete nutrient solution for 3 days and were then transferred to the same solution containing different copper concentrations [0.041, 0.082 (control), 0.164, 0.246, and 0.328 mM]. The plants were maintained in these solutions for 13 days. The nutrient solutions were replaced every 3 days, and the plants were evaluated at 6 days and 13 days after the start of the treatment. An increase in the chlorophyll index was observed at copper concentrations of 0.164, 0.246, and 0.328 mM on days 6 and 13. These concentrations of copper also affected the fluorescence parameters and caused a reduction in the pool of the final photosystem I (PSI) electron acceptors, a decrease in the total number of electron carriers per reaction centre, a decrease in the parameters related to the flow, yield, and efficiency for the reduction of the final PSI acceptor, and a decline of the total photosynthetic performance index. Therefore, high doses of copper affect the functionality of the PSI, decreasing the reduction flow of the final PSI electron acceptors.

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“…Assim, a renovação da vegetação, a reconstituição de áreas degradadas, a produção de madeira e a obtenção de fitoterápicos são baseadas na coleta de sementes, reprodução e formação de mudas das espécies (MELLO et al, 1998;ALMEIDA, 2001; CAMPOS e UCHIDA, 2002).…”

Section: Introductionunclassified

Aspectos fisioanatômicos de plantas jovens de Cupania vernalis camb. submetidas a diferentes níveis de sombreamento

Lima¹,

Alvarenga²,

Castro³

et al. 2006

Rev. Árvore

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RESUMO -Cupania vernalis Camb. (Sapindaceae) é uma espécie freqüente em quase todas as formações florestais, principalmente em Cerrado e Mata de Galeria, abrangendo os Estados de Minas Gerais, Mato Grosso e São Paulo até o Rio Grande do Sul. Essa espécie se destaca, principalmente, pelo seu emprego em plantios mistos destinados à recuperação de áreas degradadas de preservação permanente, pelo fato de seus frutos serem muito apreciados e consumidos por pássaros e, ainda, na medicina popular contra asma e tosses convulsivas. O estudo da anatomia foliar é de grande importância para a compreensão da plasticidade adaptativa de uma espécie submetida a diferentes condições ambientais, por estar correlacionada com processos de trocas gasosas e assimilação de CO 2 e outras características inerentes ao crescimento da planta. Neste trabalho, objetivou-se estudar o efeito de diferentes níveis de sombreamento (pleno sol, 30%, 50% e 70%) sobre a anatomia foliar e trocas gasosas de plantas jovens de Cupania vernalis Camb. Os resultados indicaram maior taxa fotossintética e, ainda, incrementos na condutância estomática, espessura do limbo, número de estômatos por área e espessura de parede celular em folhas de plantas crescidas sob pleno sol e 30% de sombreamento. Foram observadas correlações positivas entre características de trocas gasosas e anatomia foliar. Pelos resultados, pôde-se concluir que a espécie em estudo apresenta grande plasticidade anatômica em relação aos níveis de sombreamento testados, favorecendo, assim, um melhor desenvolvimento das mudas sob diferentes condições ambientais.Palavras-chave: Cupania vernalis Camb., fotossíntese, sombreamento e anatomia foliar. PHYSIOANATOMY TRAITS OF LEAVES IN YOUNG PLANTS OF Cupania vernalis camb. SUBJECTED TO DIFFERENT SHADING LEVELS

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Crescimento inicial de plantas de Cryptocaria aschersoniana Mez. submetidas a níveis de radiação solar

Cited by 49 publications

References 10 publications

Seed vigor, antioxidant metabolism and initial growth characteristics of red rice seedlings under different light intensities

Seed vigor, antioxidant metabolism and initial growth characteristics of red rice seedlings under different light intensities

Chlorophyll Fluorescence Transient Analysis in Alternanthera tenella Colla Plants Grown in Nutrient Solution with Different Concentrations of Copper

Aspectos fisioanatômicos de plantas jovens de Cupania vernalis camb. submetidas a diferentes níveis de sombreamento

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