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| Registros recuperados: 11 | |
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| Souza,Marcelo C. de; Bueno,Paula C.P.; Morellato,Leonor P.C.; Habermann,Gustavo. |
| The cerrado's flora comprises aluminum-(Al) accumulating and non-accumulating plants, which coexist on acidic and Al-rich soils with low fertility. Despite their existence, the ecological importance or biological strategies of these functional groups have been little explored. We evaluated the leaf flushing patterns of both groups throughout a year; leaf concentrations of N, P, K, Ca, Mg, S, Al, total flavonoids and polyphenols; as well as the specific leaf area (SLA) on young and mature leaves within and between the groups. In Al-accumulating plants, leaf flushed throughout the year, mainly in May and September; for non-accumulating plants, leaf flushing peaked at the dry-wet seasons transition. However, these behaviors could not be associated with... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Aluminum; Community; Herbivory; Mineral nutrition; Phenology; Specific leaf area. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000200813 |
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| Oliveira,Maria Aparecida José de; Bovi,Marilene Leão Alves; Machado,Eduardo Caruso; Gomes,Mara Menezes de Assis; Habermann,Gustavo; Rodrigues,João Domingos. |
| Resultados de pesquisa envolvendo aspectos fisiológicos da pupunheira (Bactris gasipaes Kunth), fruteira nativa da América Tropical, são escassos. Procurando completar essa lacuna, um experimento sob deficiência hídrica foi conduzido em casa de vegetação, durante um período de 13 dias, utilizando plantas de 12 meses de idade. O objetivo principal foi avaliar as respostas da pupunheira à deficiência hídrica. As variáveis observadas foram: taxa de assimilação de CO2, transpiração, condutância estomática e potencial de água das folhas. As coletas dos dados foram realizadas diariamente em laboratório e sob fluxo de 1200 mim-2 s-1. Os resultados foram submetidos à análise de variância e de regressão. Verificou-se decréscimo no potencial de água da folha e nas... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Bactris gasipaes; Deficiência hídrica; Fotossíntese. |
| Ano: 2002 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000100008 |
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| Alvarez,Rita de Cássia Félix; Crusciol,Carlos Alexandre Costa; Nascente,Adriano Stephan; Rodrigues,João Domingos; Habermann,Gustavo. |
| The objective of this work was to evaluate gas exchange rates, plant height, yield components, and productivity of upland rice, as affected by type and application time of plant growth regulators. A randomized block design, in a 4x2 factorial arrangement, with four replicates was used. Treatments consisted of three growth regulators (mepiquat chloride, trinexapac-ethyl, and paclobutrazol), besides a control treatment applied at two different phenological stages: early tillering or panicle primordial differentiation. The experiment was performed under sprinkler-irrigated field conditions. Net CO2 assimilation, stomatal conductance, plant transpiration, and water-use efficiency were measured four times in Primavera upland rice cultivar, between booting and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Oryza sativa; Net photosynthesis; Stomatal conductance; Transpiration; Water-use efficiency. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2012001000007 |
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| Brandão Filho,José Usan T.; Goto,Rumy; Guimarães,Vandeir Francisco; Habermann,Gustavo; Rodrigues,João D.; Callegari,Osni. |
| Compararam-se os efeitos da enxertia nas trocas gasosas de dois híbridos de berinjela em pé franco e enxertado. Conduziu-se um ensaio em ambiente protegido, na FCA/UNESP, em estrutura simples, tipo arco com 7 m de largura, 40 m de comprimento e 3 m de pé direito, cobertos por filme plástico de 100 micrometros. Foram utilizados os híbridos de berinjela Nápoli e Kokuyo, enxertados em porta-enxerto específico (híbrido Taibyo VF) para esta espécie. O delineamento experimental utilizado foi inteiramente casualizado, com quatro tratamentos (Nápoli pé franco, Nápoli enxertada, Kokuyo pé franco e Kokuyo enxertada) com dez repetições. A assimilação líquida de CO2 (A), transpiração (E), condutância estomática (g s) e eficiência no uso de água (EUA), obtida pela... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Solanum melongena L.; Fotossíntese; Transpiração; Híbridos. |
| Ano: 2003 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362003000300012 |
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| Alvarez,Rita de Cássia Félix; Habermann,Gustavo; Crusciol,Carlos Alexandre Costa; Nascente,Adriano Stephan; Rodrigues,João Domingos. |
| Studies of physiological parameters associated with crop performance and growth in different groups of upland rice (Oryza sativa L.) may support plant breeding programs. We evaluated the role of gas exchange rates and dry matter accumulation (DMA) as traits responsible for yields in a traditional (cv. ‘Caiapó’), intermediate (cv. ‘Primavera’) and modern (cv. ‘Maravilha’) upland rice cultivars. Leaf gas exchange rates, DMA, leaf area index (LAI), harvest indexes (HI) and yield components were measured on these genotypes in the field, under sprinkler irrigation. Panicles per m2 and DMA at flowering (FL) and heading, as well as CO2 assimilation rates (A) were similar across these cultivars. The highest yield was found in ‘Primavera’, which may be explained by... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Oryza sativa; Net photosynthesis; Harvest index; Dry matter accumulation rates; Crop growth rate. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052015000100001 |
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| Habermann,Gustavo; Machado,Silvia R.; Guimarães,Vandeir F.; Rodrigues,João D.. |
| Styrax camporum is a common shrub species from the cerrado regions of São Paulo State, Brazil. Although its leaves do not have a morphologically delimited pulvinus, the apical leaves are oriented parallel to the sun (paraheliotropic leaves), most notably around noon. Horizontal leaves at the base of shoots are oriented perpendicular to the sun's rays (diaheliotropic leaves). The ecophysiological significance of this is not fully understood. We investigated how paraheliotropism influences daily CO2 assimilation (A) and other gas exchange rates, water relations, leaf temperature (Tl), and how these relate to leaf structure as assessed by anatomical leaf descriptions. Paraheliotropic leaves had greater A and stomatal conductance (g s), which led to greater... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Brazilian savanna; Ecophysiology; Gas exchange; Leaf movements; Leaf temperature; Photosynthesis; Styracaceae. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202008000100008 |
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| Habermann,Gustavo; Alvarez,Rita de Cássia Félix; Modesto,Júnior Cesar; Fortes,Andréa Maria Teixeira; Rodrigues,João Domingos; Ono,Elizabeth Orika. |
| Citrus variegated chlorosis (CVC) is a disease caused by Xylella fastidiosa. Using different concentrations of plant regulators, such as auxins (indole-3-butyric acid) and gibberellic acid biosynthesis-inhibitor (paclobutrazol), physiological rooting capacity of healthy and CVC-affected stem cuttings were evaluated in order to investigate the importance of plant hormone imbalance and xylem occlusion in plants with CVC. The percentages of dead, alive and rooted cuttings, cuttings with callus and mean number of roots per cuttings did not show statistical differences in response to the distinct concentrations of synthetic plant regulators. There were differences only between healthy and CVC-affected cuttings. This showed the importance of xylem occlusion and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: IBA; Paclobutrazol; Xylella fastidiosa; Root initiation; Citrus sinensis. |
| Ano: 2006 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132006000100004 |
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| Kissmann,Camila; Habermann,Gustavo. |
| In this descriptive paper, we described germination responses of Styrax pohlii, S. camporum and S. ferrugineus seeds at 5, 10, 15, 20, 25, 30, 35, 40 and 45 °C. We also assessed the percentage germination (%G) of S. pohlii seeds with different seed water contents because, as a forest species, it seems to have recalcitrant seed behavior. Intrigued by the capacity of seeds of this species to germinate directly from puddles formed on poorly drained soils of riparian forests, where it typically occurs, we also tested the effect of de-pulping fruits on germination of S. pohlii seeds under hypoxia and normoxia conditions. In addition, we checked whether distinct concentrations of gibberellic acid (GA3) could break S. ferrugineus seed dormancy, a typical seed... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Hypoxia; Styrax pohlii; S. camporum; S. ferrugineus; Temperature; Desiccation seed tolerance. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052013000300001 |
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| Machado,Eduardo Caruso; Medina,Camilo Lázaro; Gomes,Mara de Menezes de Assis; Habermann,Gustavo. |
| Em espécies perenes podem ocorrer variações nas taxas de trocas gasosas e nas relações hídricas em função da variação das condições ambientais, durante os diferentes meses do ano. Avaliaram-se, em laranjeira ´Valência´ enxertada sobre quatro espécies de porta-enxerto, mantida sem deficiência hídrica, as taxas de fotossíntese (A) e de transpiração (E), a condutância estomática (g) e o potencial da água na folha (psi f ), medidos nos períodos da manhã (9h00 às 11h00) e da tarde (13h00 às 15h00) nos meses de janeiro, março e julho em Campinas - SP. As espécies de porta-enxertos não tiveram efeitos sobre as variáveis medidas. Independente do porta-enxerto A, g e <FONT FACE=Symbol>Y </FONT>f foram menores no período da tarde. A queda de A deve estar... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Citrus sinensis; Trocas gasosas; Transpiração; Crescimento. |
| Ano: 2002 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000100007 |
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| Registros recuperados: 11 | |
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