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| Chaloub,Ricardo M.; Reinert,Fernanda; Nassar,Cristina A. G.; Fleury,Beatriz G.; Mantuano,Dulce G.; Larkum,Anthony W. D.. |
| Photosynthetic performance of distinct marine macroalgae, Ulva fasciata Delile (green alga), Lobophora variegata (J. V. Lamouroux) Womersley ex E. C. Oliveira (brown alga), and Plocamium brasiliensis (Greville) M. A. Howe & W. R. Taylor (red alga), were compared using a pulse amplitude-modulated fluorometer. The maximum quantum yield (Fv/Fm) ranged from 0.80 to 0.51, and the lowest value was found in P. brasiliensis. Under 400 µmol photons m-2 s-1 irradiance, the highest value of photochemical quenching (qP = 0.92 ± 0.13) was observed for U. fasciata. The red alga P. brasiliensis dissipated high amounts of excitation energy (qN = 0.56 ± 0.09), resulting in relatively low values for the effective quantum yield of PS-II (0.23 ± 0.04), as well as for... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Chlorophyll fluorescence; Lobophora variegata; Plocamium brasiliensis; Ulva fasciata. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042010000200017 |
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| Fontoura,Talita; Reinert,Fernanda. |
| We studied the community and habitat occupation of epiphytes to understand how these plants cope with a supposedly stressful habitat: i) how general epiphytes occupy tree trunks, ii) how epiphytic bromeliads, occupy their supportive trees, iii) how CAM bromeliads are spatially distributed. The study was done in the dry forest of Jacarepiá, State of Rio de Janeiro. Data collection on epiphytes, phorophytes, and trees was based on the point-center quarter method. The photosynthetic pathway of the bromeliad species was determined using isotope ratio mass spectrometry. The presence of Gesneriaceae, Araceae, and Cactaceae indicates that some humidity is present in the area allowing the presence of supposedly less-specialized epiphytes. There was no correlation... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Atlantic rainforest; Bromeliaceae; Canopy; Restinga vegetation. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042009000300011 |
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| Munhoz,Márcia; Luz,Cynthia Fernandes Pinto da; Meissner Filho,Paulo Ernesto; Barth,Orthud Monika; Reinert,Fernanda. |
| A viabilidade polínica do mamoeiro cultivar 'Sunrise Solo' (Carica papaya L.) foi estudada utilizando germinação in vitro e testes colorimétricos, assim como a validade dos testes colorimétricos como estimativa de viabilidade comparada àquela do teste germinativo. Os dois meios de cultura, descritos na literatura como meios eficientes para germinação da espécie, diferem basicamente pela presença de nutrientes essenciais e concentração de ágar. O meio de cultura sem elementos essenciais e com maior concentração de ágar forneceu o melhor índice de germinação polínica (65%). Os cinco corantes testados foram: 2,3,5-cloreto de trifeniltetrazólio (TTC), Alexander, carmim acético, lugol e Sudan IV. O teste de coloração com TTC forneceu estimativa de viabilidade... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Carica papaya; Corantes polínicos; Germinação in vitro; Viabilidade polínica. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042008000200003 |
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| Valença,David da Cunha; Carvalho,Daniel Fonseca de; Reinert,Fernanda; Azevedo,Ricardo Antunes; Pinho,Camila Ferreira de; Medici,Leonardo Oliveira. |
| ABSTRACT: Concerns with water crisis involve all sectors of society and irrigated agriculture remains the main water consumer. This study evaluated an agricultural production system for lettuce cultivation in greenhouse, “organic potponics”, to economize water and manure use, using a Simplified Irrigation Controller (SIC), based on soil matric potential monitoring. Five irrigation volumes were evaluated in pots with 4.8 L, fertilized with 200 g of vermicompost. One of the volumes was controlled with the SIC. The other volumes represented 130, 80, 60 and 33 % of that controlled by the SIC and all treatments received water at the same time. Shoot fresh weight, head diameter and stomatal conductance (gs) increased linearly with irrigation volumes. For shoot... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Lactuca sativa; Water use efficiency; Production system; Water management; Automation. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162018000100052 |
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| Bezerra,Ana Carolina Mendes; Valença,David da Cunha; Carvalho,Daniel Fonseca de; Pinho,Camila Ferreira de; Reinert,Fernanda; Gomes,Daniela Pinto; Gabetto,Fernanda Palmeira; Azevedo,Ricardo Antunes; Masseroni,Daniele; Medici,Leonardo Oliveira. |
| ABSTRACT: Seedling production is an important step in the lettuce production system. However, there is a tendency to apply excessive irrigation at this stage. The aim of this study was to test the use of the Simplified Irrigation Controller (SIC) under two conditions: first, with the sensor installed in the substrate (measuring the soil water tension) and second, in the atmosphere (“atmospheric” - responding to vapor demand in the atmosphere) to control the irrigation of lettuce seedlings. The performance of the SIC was evaluated by monitoring plant traits. The lettuce seeds of the Regina cultivar were sown in styrofoam trays with commercial organic substrate. Both experiments were conducted under greenhouse conditions and evaluated under different SIC... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Lactuca sativa L.; Simplified Irrigation Controller; Water use efficiency. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162019001200179 |
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| Dealtry,Simone; Ghizelini,Angela Michelato; Mendonça-Hagler,Leda C.S.; Chaloub,Ricardo Moreira; Reinert,Fernanda; Campos,Tácio M.P. de; Gomes,Newton C.M.; Smalla,Kornelia. |
| ABSTRACT Anthropogenic activity, such as accidental oil spills, are typical sources of urban mangrove pollution that may affect mangrove bacterial communities as well as their mobile genetic elements. To evaluate remediation strategies, we followed over the time the effects of a petroleum hydrocarbon degrading consortium inoculated on mangrove tree Avicennia schaueriana against artificial petroleum contamination in a phytoremediation greenhouse experiment. Interestingly, despite plant protection due to the inoculation, denaturing gradient gel electrophoresis of the bacterial 16S rRNA gene fragments amplified from the total community DNA indicated that the different treatments did not significantly affect the bacterial community composition. However, while... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Phytoremediation; Mangrove; IncP-9 plasmids; Ndo genes. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822018000400757 |
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