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| Zanetti,Leonardo Valandro; Milanez,Camilla Rozindo Dias; Gama,Vinícius Novo; Aguilar,Marco Antonio Galeas; Souza,Carlos Alberto Spaggiari; Campostrini,Eliemar; Ferraz,Tiago Massi; Figueiredo,Fábio Afonso Mazzei Moura de Assis. |
| Abstract: The objective of this work was to evaluate the physiological and anatomical traits of plants of a cacao (Theobroma cacao) clone in response to water deficit after leaf application of silicon. A randomized complete block design was used, with four replicates, in a 2x3 factorial arrangement of two water regimes (irrigated or nonirrigated) and three silicon concentrations (0.0, 1.5, and 3.0 mg mL-1) applied in wettable SiO2 powder. The plants were evaluated 20 days after the irrigation regimes were applied. The use of SiO2 increased the stability of cell membranes and the photochemical efficiency of the plants under water deficit. The 1.5 mg mL-1 concentration of SiO2 increased photosynthetic rate, water use efficiency, and carboxylation efficiency,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Theobroma cacao; Anatomy; Antioxidant enzymes; Drought; Photochemistry; SiO2. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2016000300215 |
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| Mengarda,Liana Hilda Golin; Milanez,Camilla Rozindo Dias; Silva,Diolina Moura; Aguilar,Marco Antonio Galeas; Cuzzuol,Geraldo Rogério Faustini. |
| This study aimed to characterize the alarm and resistance phases of stress of Caesalpinia echinata under intense irradiance in order to better define its position on forest succession. The alarm phase was identified by rapid reduction in the maximum quantum yield of PSII primary photochemical reactions (ΦP0 = FV/FM) and Performance Index (PIABS) followed by total leaf abscission in the first week of exposure to direct sunlight. The new leaves grown showed recovery of chlorophyll a parameters, increase in blade thickness, elongation of the palisade and spongy parenchymas, higher water content, and reduction of specific leaf area. These changes were associated with the osmoprotector of sucrose and antioxidative of raffinose effects, which indicate an... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Forest succession; Light stress; Photoinhibition; Leaf anatomy; Soluble carbohydrates. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202012000300003 |
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