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Registros recuperados: 9
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Concentration of photosynthetic pigments and chlorophyll fluorescence of mahogany and tonka bean under two light environments Rev. Bras. Fisiol. Veg.
GONÇALVES,JOSÉ FRANCISCO DE CARVALHO; MARENCO,RICARDO ANTONIO; VIEIRA,GIL.
This study was carried out in a plantation of a degraded area in Central Amazon, Brazil, in order to assess environmental light effects on leaf pigment concentrations and chlorophyll a fluorescence in mahogany (Swietenia macrophylla King) and tonka bean (Dipteryx odorata Aubl. Willd). Three-year old saplings were grown in an open site (sun) with maximum radiation of approximately 2000 mumol m-2 s-1 and under the shade of a Ochroma pyramidale (Cav. ex Lam. Urb) canopy. A leaf area index of 2.46 was optically determined for the Ochroma foliage with 13% of full sunlight (maximum radiation about 260 mumol m-2 s-1). Carotenoid and chlorophyll concentrations were spectrophotometrically determined. Initial (Fo), maximum (Fm) and variable fluorescence (Fv) were...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Carotenoid; Dipteryx odorata; Swietenia macrophylla; Tropical species.
Ano: 2001 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-31312001000200004
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Effects of light and temperature on isoprene emission at different leaf developmental stages of eschweilera coriacea in central Amazon Acta Amazonica
Alves,Eliane Gomes; Harley,Peter; Gonçalves,José Francisco de C.; Moura,Carlos Eduardo da Silva; Jardine,Kolby.
Isoprene emission from plants accounts for about one third of annual global volatile organic compound emissions. The largest source of isoprene for the global atmosphere is the Amazon Basin. This study aimed to identify and quantify the isoprene emission and photosynthesis at different levels of light intensity and leaf temperature, in three phenological phases (young mature leaf, old mature leaf and senescent leaf) of Eschweilera coriacea (Matamatá verdadeira), the species with the widest distribution in the central Amazon. In situ photosynthesis and isoprene emission measurements showed that young mature leaf had the highest rates at all light intensities and leaf temperatures. Additionally, it was observed that isoprene emission capacity (Es) changed...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Light response curve; Temperature response curve; Leaf phenology; Tropical species.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672014000100002
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Genetic structure and gene flow of Eugenia dysenterica natural populations PAB
Zucchi,Maria Imaculada; Pinheiro,José Baldin; Chaves,Lázaro José; Coelho,Alexandre Siqueira Guedes; Couto,Mansuêmia Alves; Morais,Lizz Kezzy de; Vencovsky,Roland.
This study was carried out to assess the genetic variability of ten "cagaita" tree (Eugenia dysenterica) populations in Southeastern Goiás. Fifty-four randomly amplified polymorphic DNA (RAPD) loci were used to characterize the population genetic variability, using the analysis of molecular variance (AMOVA). A phiST value of 0.2703 was obtained, showing that 27.03% and 72.97% of the genetic variability is present among and within populations, respectively. The Pearson correlation coefficient (r) among the genetic distances matrix (1 - Jaccard similarity index) and the geographic distances were estimated, and a strong positive correlation was detected. Results suggest that these populations are differentiating through a stochastic process, with restricted...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Myrtaceae; Cerrado; Tropical species; Genetic diversity.
Ano: 2005 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2005001000005
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Growth, photosynthesis and stress indicators in young rosewood plants (Aniba rosaeodora Ducke) under different light intensities Braz. J. Plant Physiol.
Gonçalves,José Francisco de Carvalho; Barreto,Denize Caranhas de Sousa; Santos Junior,Ulysses Moreira dos; Fernandes,Andreia Varmes; Sampaio,Paulo de Tarso Barbosa; Buckeridge,Marcos Silveira.
Aniba rosaeodora is an Amazonian tree species that belongs to the family Lauraceae. Due to intense exploitation for extraction of essential oils (mainly linalol), A. rosaeodora is now considered an endangered species. On the other hand, there is little information about its ecophysiology which would be useful to support future forest planting programs. Hence, the effect of different light intensities on the growth and photosynthetic characteristics of young plants of A. rosaeodora was studied. Nine-month-old plants were subjected to four light treatments (T1= 10 a 250 µmol.m-2.s-1 / control; T2=500 to 800, T3=700 to 1000 and T4=1300 to 1800 µmol.m-2.s-1 / full sunlight). Allometric variables, gas exchange, contents of pigments and chlorophyll a...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Chlorophyll a fluorescence; Chloroplast pigment contents; Gas exchanges; Photochemical efficiency of photosystem II; Relative growth rate; Tropical species.
Ano: 2005 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202005000300007
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In vitro multiplication of Swietenia macrophylla King (Meliaceae) from juvenile shoots. Repositório Alice
SCHOTTZ, E. de S.; KALIL FILHO, A. N.; TRACZ, A. L.; KOEHLER, H.; RIBAS, L. L. F.; QUOIRIN, M..
Big-leaf mahogany (Swietenia macrophylla King) is an important species for timber production that is considered the most valuable in the world. For this reason its exploitation is indiscriminate and leads this species to the risk of extinction. Moreover, mahogany is difficult to regenerate naturally and, when used in reforestation programs, plants are severely damaged by the shoot-borer (Hypsipyla grandella Zellar). This work aimed at developing the multiplication stage of micropropagation of Swietenia macrophylla King using juvenile material. After desinfestation, seeds were germinated in MS solid culture medium. Shoot formation from seeds occurred during five months, giving 5.54 nodal segments per seed. These explants were excised, each containing one...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Cytokinins; Mahogany; Micropropagation; Tropical species.
Ano: 2007 URL: http://www.alice.cnptia.embrapa.br/handle/doc/313294
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Influence of arbuscular mycorrhizal fungi inoculum produced on-farm and phosphorus on growth and nutrition of native woody plant species from Brazil Acta Botanica
Goetten,Luis Claudio; Moretto,Geraldo; Stürmer,Sidney Luiz.
Mycorrhizal fungus inoculum produced on-farm can be used during production of woody plant seedlings to reduce costs associated with purchase of commercial inoculant and fertilization. This study aimed to test the efficiency of a mycorrhizal inoculant produced on-farm to promote growth and nutrition of woody species in combination with different levels of phosphorus. Plants were submitted to different treatments of phosphorus (0, 40 and 80 mg P/dm3) and mycorrhizal inoculation (uninoculated, and inoculation with Rhizophagus clarus [Rc] or Claroideoglomus etunicatum [Ce]). Species included were Luehea divaricata, Centrolobium robustum, Schinus terebinthifolius, Garcinia gardneriana, Cedrella fissilis, and Lafoensia pacari. The inoculum was produced using the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Biofertilizers; Inoculation; Mycorrhizal efficiency; Nursery; Seedlings growth; Tropical species.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062016000100009
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Nutritional status and specific leaf area of mahogany and tonka bean under two light environments Acta Amazonica
Gonçalves,José Francisco de C.; Vieira,Gil; Marenco,Ricardo A.; Ferraz,João Baptista S.; Santos Junior,Ulysses Moreira dos; Barros,Francisco Cleber F..
Studies on nutritional status and leaf traits were carried out in two tropical tree species Swietenia macrophylla King (mahogany) and Dipetryx odorata Aubl. Willd. (tonka bean) planted under contrasting light environments in Presidente Figueiredo-AM, Brazil. Leaves of S. macrophylla and D. odorata were collected in three year-old trees grown under full sunlight (about 2000 µmol m-2 s-1) and natural shade under a closed canopy of Balsa-wood plantation (Ochroma pyramidale Cav. Ex. Lam.Urb) about 260 µmol m-2 s-1. The parameters analysed were leaf area (LA), leaf dry mass (LDM), specific leaf area (SLA) and leaf nutrient contents. It was observed that, S. macrophylla leaves grown under full sunlight showed LA 35% lower than those grown under shade. In D....
Tipo: Info:eu-repo/semantics/article Palavras-chave: Tropical species; Leaf traits; Nutrients; Forest succession.
Ano: 2005 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672005000100004
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Scarification with sulphuric acid of Schizolobium amazonicum Huber ex Ducke seeds - Fabaceae. Repositório Alice
CRUZ, E. D.; CARVALHO, J. E. U. de; QUEIRÓZ, R. J. B..
Impermeabilidade do tegumento da semente à água ocorre em muitas espécies, inclusive em Schizolobium amazonicum Huber ex Ducke. Para promover a germinação de sementes com tegumento impermeável um dos métodos recomendados é o uso de ácido sulfúrico (H2SO4). O objetivo desse estudo foi identificar o melhor tempo de escarificação com ácido sulfúrico na superação da dormência em sementes de S. amazonicum, escarificadas durante 20, 40 e 60 minutos. Parte das sementes foi semeada imediatamente após a escarificação e parte após 24 horas de imersão em água, em uma mistura de areia e serragem (1:1), onde foram quantificadas a porcentagem e a velocidade de germinação. O delineamento foi inteiramente casualizado com quatro repetições de 50 sementes. A análise...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Espécie tropical; Região Amazônica; Semente dura; Impermeabilidade do tegumento; Escarificação; Dormência física; Tropical species; Amazonian region; Seeds coat impermeability; Physical dormancy; Scarification.
Ano: 2007 URL: http://www.alice.cnptia.embrapa.br/handle/doc/375621
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Scarification with sulphuric acid of Schizolobium amazonicum Huber ex Ducke seeds - FABACEAE Scientia Agricola
Cruz,Eniel David; Carvalho,José Edmar Urano de; Queiroz,Rafaela Josemara Barbosa.
Seed coat impermeability to water occurs in many species, including Schizolobium amazonicum Huber ex Ducke. To promote germination in seeds with coat impermeability the use of sulphuric acid (H2SO4) is recommended. The objective of this study was to identify a better time for the scarification with sulphuric acid for S. amazonicum seeds. The effect of scarification with sulphuric acid for 20, 40 and 60 min on germination and speed germination was studied for seeds that were either sowed immediately after scarification or after a 24-hour period of immersion in water. Seeds were sown on a mix of sand and sawdust (1:1). The experimental design was completely randomized with four replications of 50 seeds. The statistical analysis of germination was carried out...
Tipo: Info:eu-repo/semantics/report Palavras-chave: Tropical species; Amazonian region; Hard seed; Seeds coat impermeability; Physical dormancy.
Ano: 2007 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000300017
Registros recuperados: 9
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