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| Monteiro,Danilo R.; Melo,Hidelblandi F. de; Lins,Cintia M. T.; Dourado,Pablo R. M.; Santos,Hugo R. B.; Souza,Edivan R. de. |
| ABSTRACT Soil salinity directly affects plants, interfering in the emission of fluorescence, and promoting the degradation of photosynthetic pigments. Thus, estimating the damage to the photosynthetic apparatus caused by saline water is an important tool to detect abiotic stresses. For this purpose, sorghum plants were cultivated in a greenhouse and irrigated with two water sources (NaCl and salt mixture) with six levels of electrical conductivity (EC) (0, 2.5, 5, 7.5, 10, and 12.5 dS m-1), forming a 6 × 2 factorial in randomized blocks with four repetitions. At 60 days after sowing, the photosynthetic pigments were quantified, the chlorophyll a fluorescence parameters (initial fluorescence [F0]; variable fluorescence [Fv]; maximum fluorescence [Fm];... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Salinity; Photosynthetic pigments; Photochemical efficiency. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662018001000673 |
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| Gomes,Alirya Magda Santos do Vale; Reis,Fabrício de Oliveira; Lemos,Raimunda Nonata Santos de; Mondego,Janaína Marques; Braun,Heder; Araujo,José Ribamar Gusmão. |
| Abstract Aleurocanthus woglumi (Ashby, 1915) is an important agricultural pest that causes yield losses of 20-80% in citrus plants by removing plant nutrients while feeding and allowing the formation of sooty mold. The objective of this study was to evaluate physiological changes in citrus plants in response to A. woglumi infestation under field conditions. The experiment was conducted in a citrus orchard in Paço do Lumiar, Maranhão, Brazil. Thirty-two citrus plants were used, including eight of each of the following varieties: Tahiti lime, Tanjaroa tangerine, Nissey tangerine, and Ponkan tangerine. Four random plants with A. woglumi infestation and four plants free from this pest were selected from each variety. The physiological parameters evaluated were... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Aleurocanthus woglumi; Citrus latifolia; Gas exchange; Photochemical efficiency. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0085-56262019000200119 |
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| Vital,Roberto Gomes; Jakelaitis,Adriano; Silva,Fábia Barbosa; Batista,Priscila Ferreira; Almeida,Gabriel Martins; Costa,Alan Carlos; Rodrigues,Arthur Almeida. |
| ABSTRACT The maturing of drift used in the culture of sugar cane can have harmful effects on other crops grown in the vicinity of sugar cane plantations. Among these, sunflower grown in the off-season can have its growth and productivity affected by drift. The objective of this research was to evaluate whether the drift of trinexapac-ethyl and glyphosate promotes changes in the photosynthetic metabolism of sunflower plants. Two trials were carried out to evaluate the effects of these products on gas exchange, chlorophyll fluorescence, chloroplastid pigments, membrane permeability, sugar content, as well as shikimic acid and malondialdehyde concentration in the treated plants. In the first experiment, we tested glyphosate in doses of 0 (control); 3.6; 7.2;... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Gibberellin; EPSPs; Photosystem II; Photochemical efficiency. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052017000100033 |
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