Crescimento inicial de mudas de Bombacopsis glabra (Pasq.) A. Robyns sob condição de sombreamento

Scalon, Silvana de Paula Quintão; Mussury, Rosilda Mara; Rigoni, Marilúcia Rossi; Filho, Homero Scalon

doi:10.1590/s0100-67622003000600001

Cited by 65 publications

(69 citation statements)

References 4 publications

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“…(Scalon et al, 2003), Cryptocarya aschersoniana (Almeida et al, 2004) The increase in the chlorophyll b relative proportion is an important characteristic of shaded environments because it catches the photons energy in longer wavelengths, therefore, with less energy and transfers it to chlorophyll a which acts effectively in the photosynthesis photochemical reactions. This mechanism allows some plants to adapt to conditions of less luminous intensity due to a higher efficiency in the absorption of the luminous energy of less intensity, as well as an amplification of the photosynthetic active spectrum (Whatey & Whatey, 1982).…”

Section: Resultsmentioning

confidence: 99%

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Initial development and gas exchange of Talisia subalbens (Mart.) Radlk. under different shading conditions

et al. 2011

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Ecophysiological studies under semi-controlled conditions in nurseries and greenhouses are essential to enable the use of native species to recover degraded areas and for commercial planting. Talisia subalbens (Mart) Radlk, 'cascudo', is a native fruiting species of the Cerrado on the verge of extinction. The ecophysiological performance of this species was evaluated in nursery conditions under different levels of shading (full sunshine, 30%, 50% and 70%). Initial growth, biomass allocation, gas exchange and chlorophyll content of the plants were analyzed. Full sunshine cultivated plants showed a higher accumulation of total, shoot, and root dry biomass. There was no significant difference in the root/shoot ratio among the treatments. Seedlings cultivated under full sunshine and 30% shading showed higher values for height, basal diameter, and leaf area. Differences in stomata conductance and photosynthesis rate were not observed among the different shading levels. Plants cultivated under 70% of shading had higher contents of chlorophyll a, b, and total. During the initial phase with higher levels of radiation were fundamental for the development of T. subalbens seedlings.

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Section: Resultsmentioning

confidence: 99%

“…(Almeida et al, 2004), Jacaranda puberula Cham (Almeida et al, 2005b) and Bombacopsis glabra (Scalon et al, 2003).…”

Section: Resultsmentioning

confidence: 99%

Initial development and gas exchange of Talisia subalbens (Mart.) Radlk. under different shading conditions

et al. 2011

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“…Já, o sombreamento de 30% propiciou um crescimento intermediário ao do tratamento 0% e os obtidos nos tratamentos 50% e 80% de sombreamento. Avaliando o crescimento da parte aérea de plantas de castanha-domaranhão sob sombreamentos de 0%, 30% e 50%, Scalon et al (2003) concluíram que as mudas crescidas em pleno sol apresentaram maior massa seca, contrastando com um menor acúmulo nas mudas sob 50% de sombreamento.…”

Section: Resultsunclassified

“…De acordo com isso, folhas adaptadas à sombra possuem uma menor relação clorofila a/b do que as adaptadas ao sol (TAIZ & ZEIGER, 2002).…”

Section: Introductionunclassified

“…O aumento da proporção de clorofila b é uma característica importante de ambientes sombreados, porque esta capta energia de outros comprimentos de onda e a transfere para a clorofila a, que efetivamente atua nas reações fotoquímicas da fotossíntese e representa um mecanismo de adaptação à condição de menor intensidade luminosa (SCALON et al, 2003).…”

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Formação de mudas de maracujazeiro "amarelo" sob níveis de sombreamento em Ji-Paraná/RO

2006

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RESUMOA utilização de sombreamento é uma importante técnica na formação de mudas de maracujá. O grau de sombreamento pode afetar diretamente o crescimento das mudas e a posterior formação do pomar. Com o presente trabalho, objetivou-se avaliar o crescimento e os teores de pigmentos fotossintéticos em mudas de maracujazeiro amarelo (Passiflora edulis Sims f. flavicarpa Deg.) formadas em diferentes níveis de sombreamento. Foram testados quatro tratamentos de sombreamento: 0%; 30%; 50% e 80%. Cada tratamento constou de cinco repetições dispostas em delineamento inteiramente casualizado. Após 90 dias da semeadura foram realizadas análises quanto ao crescimento e teor de pigmentos fotossintéticos. Em relação às análises de crescimento, constatou-se que a exposição a pleno sol foi prejudicial às mudas. Os níveis de sombreamento de 50% e 80% foram os mais favoráveis ao crescimento das mudas. Houve uma redução na relação clorofila a/b e um aumento dos teores de clorofila total e carotenóides totais com o aumento do sombreamento.Termos para indexação: Passiflora edulis, crescimento, clorofila, propagação. ABSTRACTThe shading is an important technique used to the formation of passion fruit seedlings. Thus, the shadow intensity can directly affect the growth of the seedlings and the further formation of the orchard. The present work aimed at evaluating the growth and the photosynthetic pigments content in yellow passion fruit seedlings (Passiflora edulis Sims f. flavicarpa Deg.) grown under different shading levels. Four shading treatments were used: 0%; 30%; 50% and 80%, with five replications each one in a complete randomized design. After 90 days of the sowing the growth and the photosynthetic pigments concentration were analyzed. The seedlings growth was impaired under full sunshine. The most favorable shading treatments for the seedlings growth were 50% and 80%. The chlorophyll a/b ratio decreased and the total concentration of chlorophyll and carotenoids increased with the increase of the shading.Index terms: Passiflora edulis, growth, chlorophyll, propagation. INTRODUÇÃOO maracujá-amarelo (Passiflora edulis Sims f. flavicarpa Deg.) tornou-se uma espécie de importância significativa no agronegócio de frutas tropicais. Como reflexo, houve um grande interesse dos produtores por informações técnicas sobre a obtenção de mudas de boa qualidade (MELETTI, 2000). A formação de mudas em viveiro é uma prática muito empregada na cultura do maracujá. A utilização de viveiros pressupõe um sombreamento das plantas por um determinado período que antecede o transplante para o campo (MELETTI, 1994).Entre os diversos componentes do ambiente, a luz é primordial para o crescimento das plantas, não só por fornecer energia para a fotossíntese, mas, também, por fornecer sinais que regulam seu desenvolvimento por meio de receptores de luz sensíveis a diferentes intensidades, qualidade espectral e estado de polarização. Dessa forma, modificações nos níveis de luminosidade aos quais uma espécie está adaptada podem condicionar diferentes resp...

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Morphological and photosynthetic alterations in the Yellow-ipe, Tabebuia chrysotricha (Mart. Ex DC.) Standl., under nursery shading and gas exchange after being transferred to full sunlight

et al. 2009

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The objective of this study was to evaluate the effect of nursery shading on the Yellow-ipe seedling (Tabebuia chrysotricha) growth, photosynthesis, and photosynthetic acclimation after being transferred into direct sunlight. The Yellow-ipe seedlings were grown under 0, 50, 70 and 95% shade. At the 134th day of sowing, leaf gas exchange and chlorophyll were measured under current growth shading, after exposure to 15 min and two day full sunlight. With the increase of shading, the Yellow-ipe seedlings allocated more biomass to the stem and leaves and less to the roots, and there was an increase in the leaf area ratio and specific leaf area. In relation to 0% of shading there was a increase of 211% in stem, 116% in leaf, and a reduction of 200% in roots biomass when seedling were grown under 95% of shading. The total biomass accumulation had a high correlation with collar diameter (r = 0.96). More than 70% of the shading reduced the photosynthesis, and after transferring the seedlings into full sunlight, more than 50% of the shading induced a reduction in chlorophyll, stomatal conductance, photosynthesis and instantaneous carboxylation efficiency, suggesting the presence of a photoinhibition process. The Yellow-ipe seedling growth under nursery conditions should not be done under more than 50% shading, which may result in the lower seedling quality and poorer acclimation to transplantation, particularly to severe degraded areas with direct sunlight. The species can be used for recovering from totally devastated forest areas to initial recovery when full canopy are forming.

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Crescimento inicial de mudas de Bombacopsis glabra (Pasq.) A. Robyns sob condição de sombreamento

Cited by 65 publications

References 4 publications

Initial development and gas exchange of Talisia subalbens (Mart.) Radlk. under different shading conditions

Initial development and gas exchange of Talisia subalbens (Mart.) Radlk. under different shading conditions

Formação de mudas de maracujazeiro "amarelo" sob níveis de sombreamento em Ji-Paraná/RO

Morphological and photosynthetic alterations in the Yellow-ipe, Tabebuia chrysotricha (Mart. Ex DC.) Standl., under nursery shading and gas exchange after being transferred to full sunlight

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