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Boeger, Maria Regina Torres; Pilatti, Daiane Maria; Lima, Carolina Sereneski de; Alvarenga, Allan Mauricio Sanches Baptista de; Pereto, Suelen Cristina Alves da Silva. |
Shade plants of ombrophilous forests are subjected to light-limiting conditions and need to invest in architectural structures associated with leaf symmetry to increase light capture. This study investigated the leaf architecture of six Araucaria forest tree species with distinct symmetry: Cupania vernalis, Casearia sylvestris, Schinus terebinthifolius, Piper gaudichaudianum, Roupala brasiliensis and Cedrela fissilis. We hypothesized that symmetry, associated with other traits, minimizes self-shading. Asymmetry index, petiole length, total leaf area, leaf angle, internode length and stem diameter were measured. The asymmetry index did not indicate a clear distinction between asymmetric and symmetric leaves. Leaves classified as asymmetric had higher... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: 2.03.00.00-0; 2.03.02.00-2. ombrophilous forest; Asymmetry index; Leaf morphology; Shade leaves; Light efficiency. Botânica; Morfologia Vegetal. |
Ano: 2018 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/43118 |
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Boiago, Nayara Parisoto; Fortes, Andréa Maria Teixeira; Pilatti, Daiane Maria; Silva, Paulo Sérgio Siberti da. |
This study aimed to analyse the allelopathic bioactivity of fresh and infused aqueous extracts of Brazilian cherry leaves on the germination of lettuce and the initial development of maize. Brazilian cherry leaves were used to prepare a fresh aqueous extract (200 g L-1) and an infused extract (100 g L-1), which were diluted to concentrations of 0.4, 0.8, 1.2, 1.6 or 2.0% w/v. The variables evaluated in lettuce were the germination rate (GR), germination time index (GTI), germination speed index (GSI) and root length (RL). To determine the effect on the initial development of maize, we measured the shoot (SL) and root (RL) length. The experimental design included a factorial 2 × 5 design (two extracts and five concentrations), in addition to a control... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: 2.03.00.00-0; 2.03.03.00-9 Lactuca sativa; Zea mays; Allelopathy; Allelochemicals; Chemical ecology. Botânica; Fisiologia Vegetal. |
Ano: 2018 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/40972 |
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