Ajustes morfológicos e fisiológicos em plantas jovens de Araucária angustifolia (Bertol.) Kuntze em resposta ao sombreamento

Franco, Ana María; Dillenburg, Lúcia Rebello

doi:10.1590/s2236-89062007000200002

Cited by 31 publications

(31 citation statements)

References 36 publications

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“…Se a pleno sol ocorreu maior produção de MS, isso diluiu mais o nitrogênio absorvido e translocado para as partes aéreas que nas plantas sombreadas, nas quais a produção de MS foi menor. Isso ocorre porque a planta não está metabolizando todo o nitrogênio absorvido e convertendo-o em acúmulo de MS. De acordo com outros autores (Franco & Dillenburger, 2007;Hale & Orcutt, 1987), as plantas adaptadas à sombra tendem a priorizar reservas para o crescimento de área foliar e para aumentar a concentração de clorofila.…”

Section: Resultsunclassified

Influência da luminosidade no comportamento de onze espécies forrageiras perenes de verão

et al. 2009

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RESUMO -Objetivou-se avaliar o comportamento de espécies forrageiras (Brachiaria decumbens cv. Basilisk, Brachiaria brizantha cv. Marandu, Panicum maximum cvs. Tanzânia, Aruana e Mombaça, Hemarthria altissima cv.Florida; Paspalum notatum cv. Pensacola, Axonopus catharinensis, Cynodon sp. híbrido Tifton-85; Arachis pintoi cvs.Alqueire e Amarillo) submetidas a diferentes níveis de luminosidade produzidos por árvores de Pinus taeda (céu aberto; 9 m entre linhas e 3 m entre árvores; e 15 m entre linhas e 3 m entre árvores). Avaliaram-se a produção de MS, a relação lâmina foliar:colmo (L:C), o nível de florescimento das plantas, os teores de PB e FDN e as variáveis meteorológicas e do solo, na projeção da copa e no meio da entrelinha de árvores, de cada parcela. A produção de MS foi afetada negativamente pelo sombreamento, por outro lado, o teor de PB foi maior nas parcelas sombreadas em relação ao pleno sol. Além da menor radiação, a velocidade do vento e a temperatura do solo nas parcelas sombreadas foram menores naquelas a sol pleno. O teor de FDN não diferiu significativamente entre os níveis de luminosidade, embora a relação L:C tenha sido maior na entrelinha do 9 × 3 em relação àquela a céu aberto. As espécies forrageiras mais produtivas e com maior potencial para utilização em ambiente Key Words: forage production, shading, silvipastoral system IntroduçãoOs sistemas silvipastoris têm sido amplamente estudados e aplicados na agropecuária tropical e subtropical visando otimizar a utilização das áreas. Há possibilidade de adaptação de várias espécies forrageiras ao cultivo em consórcio com espécies arbóreas e diferenças no comportamento das pastagens, especialmente em virtude das condições microclimáticas e da competição entre os componentes vegetais pelos recursos naturais disponíveis.

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Section: Resultsunclassified

Influência da luminosidade no comportamento de onze espécies forrageiras perenes de verão

et al. 2009

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“…According to Veglio (2010), the restriction of the radiation induces the etiolation of the plant, being, this mechanism, caused by the interaction of phytormons. According to Franco et al (2007), regardless of plant tolerance, height increase, either at the beginning or at later stages of development, would be a favorable response to the survival of the plant under shading condition, due to positive net growth considered as a factor of greater importance (Lusk, 2004). The results found for stem diameter (Fig.…”

Section: Resultsmentioning

confidence: 84%

Initial development of licuri (Syagrus coronata (Mart.) Becc.) –Arecaceae seedlings under different substrates and luminosity levels

2017

Aust. J. Basic & Appl. Sci.

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A R T I C L E I N F O A B S T R A C TLicuri is a palm tree typical of the Brazilian Northeast semi-arid region and of great socioeconomic importance for communities in the region. Despite its importance, few works were developed addressing its propagation and conservation. Studies about luminosity levels and different substrates may result in different growth responses, optimizing the production of seedlings. Therefore, the aim of this study was to evaluate the initial growth and compare the leaf anatomy of licuri seedlings subjected to different substrates and light levels. Licuri seedlings were conditioned in full sun and 50% shading, and the substrates sand, vegetal soil, sand mixed with organic compound and vegetal soil mixed with organic compound. After 90 days of cultivation, was evaluating growth and foliar anatomy. The shoot height, total leaf area, number of leaves, leaf dry weight, stem dry weight and root dry weight showed higher values in the seedlings grown in 50% shading. In full sun, there was an increase only for stem diameter. The dry weight of the root was significantly greater in sand or vegetal soil. For the total leaf area, the same substrates, however, with the presence of the organic compound, presented higher values. Seedlings grown under full sun provided greater thicknesses of adaxial epidermis and adaxial hypodermis. The abaxial epidermis, abaxial hypodermis and mesophyll presented greater thicknesses, regardless of the luminosity tested, in the substrates that contained vegetal soil, with or without the presence of organic compound. The use of sand or vegetable soil and the shaded environment provide better conditions for the production of licuri seedlings. Foliar anatomical analysis is a good indicator to verify the quality of licuri seedlings when grown under different environmental conditions.

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“…The medicinal species Hyptis marrubioides (Sales et al, 2009) and Baccharis trimera (Silva et al, 2006) presented higher plant height in shaded treatments; however, the increase in height in environments with high luminous restrictions, can result etiolated plants (Franco and Dillenburg, 2007), compromising the shoot and also the issue of side branches. Considering that one of the main objectives of Aloysia triphylla cultivation is the extracted essential oil from the leaves, the variable DLM is considered one of the most important.…”

Section: Plant Height and Total Dry Matter For Leaves And Branches Ismentioning

confidence: 99%

Biomass and morphological parameters of lemon verbena (Aloysia triphylla) under different shading levels during different seasonal conditions

Schmidt¹,

Caron²,

Menegat³

et al. 2017

Aust J Crop Sci

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Shading greenhouse may be an effective method to achieve a suitable environment for crop growth in subtropical regions. The aim of this study was to evaluate the production of leaves and branches as well as the morphological parameters of height and leaf area of the species Aloysia triphylla, under different shading levels throughout the seasons of the year. A randomized block design in factorial scheme 3x4x6, i.e., three levels of shading (0%, 30% and 50%), four seasons (summer, autumn, winter and spring) and six collection in each season (15, 30, 45, 60, 75 and 90 days after the beginning of each season), with four replications, was used. All evaluations were performed in 2012, since in the first evaluation (summer) the plants had 65 days after transplanting and the last evaluation (spring) the plants had 315 days after transplanting. The dry matter of leaves and branches, leaf area, and plant height were evaluated. The production of the dry matter of leaves and branches, and height and leaf area for the species Aloysia triphylla is influenced by shading levels and the seasons of the year. The variables are highly dependent on the seasonality of meteorological elements such as temperature, solar radiation, rainfall, and frost. In an environment with 0% shading, the dry matter production of leaves was 60.8 % higher in the spring, than those observed for the 30% and 50 % of shading, while this levels resulted higher production in the summer. We showed that the use of shading screens in order to attenuate the solar radiation in places or seasons where there is high light intensity is an effective method to achieve higher production of leaves, which is important source for the oil production.

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Ajustes morfológicos e fisiológicos em plantas jovens de Araucária angustifolia (Bertol.) Kuntze em resposta ao sombreamento

Cited by 31 publications

References 36 publications

Influência da luminosidade no comportamento de onze espécies forrageiras perenes de verão

Influência da luminosidade no comportamento de onze espécies forrageiras perenes de verão

Initial development of licuri (Syagrus coronata (Mart.) Becc.) –Arecaceae seedlings under different substrates and luminosity levels

Biomass and morphological parameters of lemon verbena (Aloysia triphylla) under different shading levels during different seasonal conditions

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