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A method to assess algicidal activity of microalgal extracts coupling microalgae produced in stirred closed photobioreactor operating in continuous with pulse amplitude modulated (PAM) fluorometry ArchiMer
Menguy, Eva; Dumontet, Vincent; Coulombier, Noémie; Meriot, Vincent; Le Dean, Loic; Barthelemy, Vanille; Jauffrais, Thierry.
We describe in the present study a quick and reliable method based on chlorophyll a fluorescence to assess putative algicidal effect of different microalgal extracts. We couple microalgal production under chemostat cultivation mode to continuously produce a given microalgae species (e.g. Dunaliella salina in this study) at a stable physiological state to ease comparison between extracts tested; with a non-destructive method based on chlorophyll a fluorescence. Pulse amplitude modulated (PAM) fluorometry was used to assess over time the effect of different microalgal crude extracts on the efficiency of the photosystem II (PSII) of a tested microalgae (Dunaliella salina). • Microalgal production at stationary phase in stirred closed photobioreactor (PBR)...
Tipo: Text Palavras-chave: Bioassay; Cytoxicity; Microalgae; Quantum efficiency; Fv/Fm; Non photochemical quenching; NPQ; Electron transport rate; Phytochemistry; Anti algal.
Ano: 2020 URL: https://archimer.ifremer.fr/doc/00643/75524/76400.pdf
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Ammonium Glufosinate Associated with Post-Emergence Herbicides in Corn with the cp4-epsps and Pat Genes Planta Daninha
KRENCHINSKI,F.H.; CESCO,V.J.S.; CASTRO,E.B.; CARBONARI,C.A.; VELINI,E.D..
ABSTRACT: With the possibility of using ammonium glufosinate in corn, studies on its association with other herbicides are essential. The aim of this study was to assess weed control and herbicide selectivity in association with ammonium glufosinate in corn containing the pat and cp4-epsps genes. The experiment was carried out under field conditions in two sites in a randomized block design with four replications. Treatments consisted of ammonium glufosinate, glyphosate, ammonium glufosinate + glyphosate, ammonium glufosinate + nicosulfuron, ammonium glufosinate + atrazine, ammonium glufosinate + tembotrione, ammonium glufosinate + mesotrione, ammonium glufosinate + carfentrazone ethyl, ammonium glufosinate + bentazon, ammonium glufosinate + 2,4-D, control...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Ammonia accumulation; Phosphinothricin; Electron transport rate; Herbicide resistance; Zea mays.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582019000100241
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Chemical stress reduces the lateral shoot growth in vernalized garlic Horticultura Brasileira
Gabriel,André; Resende,Juliano TV; Marodin,Josué C; Matos,Rafael de; Zeist,André R; Maciel,Cleber Daniel G.
ABSTRACT Brazil’s low garlic productivity is attributed, mainly to the lateral shoot growth, a physiological anomaly characterized by early lateral shoot growth of cloves in noble group garlic cultivars. Considering the aforementioned information, the aim was to evaluate the occurrence of lateral shoot growth and productivity characteristics in garlic plants, cv. Chonan, subject to herbicide chemical stress. In order to do so, an experiment was conducted in outlining randomized blocks in a 3x5 factorial scheme, constituted by three herbicides (paraquat 500 g ha-1; ammonium gluphosinate 400 g ha-1 and glyphosate 720 g ha-1) and five subdoses (0, 5, 10, 15 and 20% of the minimum recommended dose of each herbicide). The electron transport rates (ETR) were...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Allium sativum; Herbicide; Electron transport rate.
Ano: 2020 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362020000100041
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CHLOROPHYLL FLUORESCENCE IN Brachiaria decumbens AND Brachiaria ruziziensis SUBMITTED TO HERBICIDES Planta Daninha
SILVEIRA,R.R.; SANTOS,M.V.; FERREIRA,E.A.; SANTOS,J.B.; SILVA,L.D..
ABSTRACT Different doses of herbicides can promote a differentiated physiological response in grasses of the same genus. This study has been proposed in order to evaluate physiological responses of B. ruziziensis and B. decumbens submitted to glyphosate and fluazifop-p-butyl. Treatments were distributed in a 2 x 6 factorial design with five repetitions, being two grasses: B. decumbens cv. Basilisk and B. ruziziensis with six doses of herbicides: 0.00; 0.25; 0.50; 1.00; 1.5 and 2.00 times the commercial dose recommended by manufacturers. At 7, 15, 21, and 30 days after herbicide application (DAA) chlorophyll luminous energy uptake efficiency was evaluated. Plants subjected to glyphosate at 7 days after application (DAA) showed minimum fluorescence of 270...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Physiology; Fluazifop-p-butyl; Glyphosate; Electron transport rate; Urochloa.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582017000100248
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Chlorophyll fluorescence in guanandi tree (Calophyllum brasiliense) after herbicide application Planta Daninha
ARALDI,R.; CORNIANI,N.; TROPALDI,L.; GIROTTO,M.; BELAPART,D.; SIMÕES,P.S.; VELINI,E.D..
Chlorophyll fluorescence is currently used as a rapid diagnostic and nondestructive method to detect and quantify damage on the photosynthetic apparatus of leaves on weeds, crops and ornamental/coniferous trees in response to both environmental stress and herbicides. This study aimed to evaluate chlorophyll fluorescence in guanandi plants (Calophyllum brasiliense) after application of different postemergence herbicides. The experiment was performed in a completely randomized design, with six treatments (control, bentazon, sulfentrazone, isoxaflutole, atrazine and glyphosate) and five replications. The herbicide treatments were applied with a stationary sprayer, and electron transport rate (ETR) was subsequently analyzed with OS5p Multi-Mode Chlorophyll...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Electron transport rate; Bentazon; Sulfentrazone; Isoxaflutole; Atrazine; Glyphosate.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582015000100077
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Dynamics of phytoplankton productivity and exopolysaccharides (EPS and TEP) pools in the Seine Estuary (France, Normandy) over tidal cycles and over two contrasting seasons ArchiMer
Morelle, Jerome; Schapira, Mathilde; Claquin, Pascal.
Exopolysaccharides (EPS) play an important role in the carbon flux and may be directly linked to phytoplankton and microphytobenthos production, most notably in estuarine systems. However the temporal and spatial dynamics of estuarine EPS are still not well understood, nor how primary productivity triggers this variability at these different scales. The aim of this study was to investigate the primary productivity of phytoplankton and EPS dynamics in the Seine estuary over a tidal cycle in three different haline zones over two contrasted seasons. The other objectives was to investigate the origin of pools of soluble carbohydrates (S-EPS) and transparent exopolymeric particles (TEP) in phytoplankton, microphytobenthos or other compartments. High frequency...
Tipo: Text Palavras-chave: Phytoplankton; Microphytobenthos; PAM fluorometer; Electron transport rate.
Ano: 2017 URL: http://archimer.ifremer.fr/doc/00400/51132/51898.pdf
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Photochemical activity modulated by water, nitrogen, and phosphorus status in cactus pear. Repositório Alice
LOPES, M. N.; GOMES, G. M. F.; MARANHÃO, T. D.; SILVEIRA, W. M.; POMPEU, R. C. F. F.; SILVA, R. G. da; BEZERRA, M. A.; CÂNDIDO, M. J. D..
This study aimed to evaluate the effects of nitrogen (N) and phosphorus (P) associated with dry and rainy seasons on the photochemical activity of Opuntia ficus-indica (L.) Mill. cv. Gigante. Combinations of N (10.0, 70.0, 100.0, 130.0, and 190.0 kg ha-1 yr-1) and P2O5 (10.0, 70.0, 100.0, 130.0, and 190.0 kg ha -1 yr -1) were evaluated in the dry and rainy seasons in semi-arid regions. A completely randomized block design with split-plot arrangement was adopted with four replications. In Quixadá, the maximum potential quantum efficiency of photosystem II (Fv/Fm) was 0.82, observed in third-order cladodes (rainy season and N/P 75.6/10.0 kg ha -1 yr -1), while in Tejuçuoca, the maximum Fv/Fm was 0.81, found in 2nd/3rd order cladodes (rainy season and N/P...
Tipo: Artigo de periódico Palavras-chave: Effective quantum efficiency of PSII; Electron transport rate; Fertilization; Feed crops; Opuntia Ficus Indica; Planta Forrageira; Palma Forrageira; Water stress; Opuntia ficus-indica; Brazil; Semiarid soils; Forage crops.
Ano: 2021 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1133211
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Physiological and anatomical characteristics of leaves of two clones of guarana PAB
Gonçalves,José Francisco de Carvalho; Santos Júnior,Ulysses Moreira dos; Silva,José Ferreira da; Arruda,Murilo Rodrigues de; Bonates,Luiz Carlos de Matos; Fernandes,Andreia Varmes.
The objective of this work was to analyze gas exchange, photosynthetic characteristics, photochemical efficiency of photosystem II and anatomical characteristics of young plant leaves of two guarana (Paullinia cupana) clones (BRS-CG372RC and BRS-CG611RL) growing under open field. The variables of gas exchange and fluorescence of chlorophyll a were evaluated in mature leaves. The values of photosynthesis and transpiration found for BRS-CG372RC were 27% greater and 80% lesser than values found for BRS-CG611RL, respectively. The values of stomatal conductance found for the clones BRS-CG372RC and BRS-CG611RL were in the order of 224 and 614 mmol mm-2 s-1, respectively. The values of photorespiration, rate of carboxylation and rate electron transport were...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Paullinia cupana; Photosynthesis; Photochemical efficiency of photosystem II; Electron transport rate; Water use efficiency; Stomatal anatomy.
Ano: 2006 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2006000300004
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Responses of Conocarpus lancifolius to environmental stress: a case study in the semi-arid land of Kuwait Phyton
Redha,A; Suleman,P; Al-Hasan,R; Afzal,M.
Cococarpus lancifolius Engl. grows wild in Djibouti, Somalia and East Africa, and South Asia. The species was introduced into Kuwait, where it is exposed to several stresses: oil pollution, salinity, high temperature and harsh climatic conditions. These conditions are prevalent in its semi-arid environment. In this study, the impact of salinity (2, 6 and 10%), temperature (20, 30 and 40 °C), polyethylene glycol (10, 30 and 60%) and drought has been investigated on C. lancifolius. Proline (Pro) accumulation (5.5 ± 0.03 µg/g dry weight; p=0.05-0.005), protein (16.47 ± 0.052 mg/g; p=0.001), free amino acids (10.92 ± 0.082 mg/g; p=0.006) and lipids (116.05 ± 2.17 µg/g; p=0.05) were measured in plants irrigated with 60% polyethylene glycol (PEG) for 6 days....
Tipo: Info:eu-repo/semantics/article Palavras-chave: Conocarpus lancifolius; Drought; Electron transport rate; Environmental stress; Salinity; Temperature; Photosynthesis.
Ano: 2012 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572012000200008
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Selectivity of Herbicides Inhibitors of Photosystem II for Sugarcane Cultivars Planta Daninha
SIMÕES,P.S.; CARBONARI,C.A.; NASCENTES,R.F.; STASIEVSKI,A.; VELINI,E.D..
ABSTRACT For the successful execution of chemical weed control in sugarcane crop, the selectivity of herbicides is a factor of great importance to maximize crop yield. Each cultivar may respond differently to the same herbicide in the same dose, and selectivity is not only determined by the visual presence or absence of phytotoxicity. Thus, the aim of this study was to evaluate the effects of herbicides amicarbazone, tebuthiuron, and diuron + hexazinona on the electron transport rate in photosystem II (ETR), along with the development and yield of sugarcane cultivars RB867515, CTC 4, CTC 9, and CTC 17 in greenhouse, and field conditions. Under greenhouse conditions ETR was assessed by a portable fluorometer, aa well as dry weight and phytotoxicity of the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Amicarbazone; Tebuthiuron; Diuron; Hexazinona; Electron transport rate; Saccharum spp.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582016000400803
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