Effect of trifluoroacetate, a persistent degradation product of fluorinated hydrocarbons, on Phaseolus vulgaris and Zea mays

Smit, Martin; Heerden, P.D.R. Van; Pienaar, Jakobus J.; Weißflog, L.; Strasser, Reto J.; Kruger, Gert J.

doi:10.1016/j.plaphy.2009.02.003

Cited by 43 publications

(28 citation statements)

References 29 publications

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“…OJIP transients were analyzed according to the JIP-test Jiang et al 2008;Smit et al 2009). The following data from the original measurements were used: fluorescence intensities at 20 ls (considered as F o ), 300 ls (F 300ls ), 2 ms (J-step, F J ), 30 ms (I-step, F I ) and P-step (considered as F m ).…”

Section: Leaf Gas Exchange and Ojip Transientsmentioning

confidence: 99%

Physiological impacts of magnesium-deficiency in Citrus seedlings: photosynthesis, antioxidant system and carbohydrates

Yang

Jiang

et al. 2012

Trees

134

114

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Magnesium (Mg)-deficiency affects productivity and quality in agriculture, yet at a physiological level it is not well understood. Citrus grandis and Citrus sinensis seedlings were irrigated for 12 weeks with 0, 50, 500 or 2,000 lM MgSO 4 . Thereafter, Mg-deficiency-induced changes in photosynthesis, antioxidant system and carbohydrates were investigated. Mg-deficiency affected CO 2 assimilation more in C. grandis leaves than in C. sinensis ones, but Mg-deficiency-induced accumulation of sugars was not higher in the former except for sucrose. Mg-deficiency-induced photoinhibitory impairment occurring on the whole photosynthetic electron transport chain was more severe in C. grandis leaves than in C. sinensis ones. Mg-deficient leaves had higher or similar activities of antioxidant enzymes and contents of antioxidant metabolites except for catalase (CAT) activity and reduced glutathione (GSH) content. However, Mg-deficiency increased leaf malondialdehyde (MDA) content. In conclusion, the greater decrease in CO 2 assimilation in Mg-deficient C. grandis leaves may be caused by the greater decrease in the photosynthetic electron transport capacity. Mg-deficiency-induced up-regulation in leaf antioxidant system does not provide enough protection to Mg-deficient leaves against the oxidative damage.

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Section: Leaf Gas Exchange and Ojip Transientsmentioning

confidence: 99%

Physiological impacts of magnesium-deficiency in Citrus seedlings: photosynthesis, antioxidant system and carbohydrates

Yang

Jiang

et al. 2012

Trees

134

114

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“…Um aumento da fase O-J evidencia possível deficiência na capacidade de Q A -em reoxidar-se. Resultados semelhantes foram descritos por Smit et al (2009), que trabalhando com diferentes concentrações de trifluoracetato, em feijoeiro, observaram aumento da fase O-J, indicando um acúmulo de Q A -. Na fase J-I, houve incremento na intensidade da fluorescência durante os estádios de antese, maturação fisiológica e colheita.…”

Section: Resultsunclassified

“…A análise da fluorescência da clorofila a tem possibilitado a aquisição de importantes informações sobre a relação entre estrutura e função do fotossistema II (FS II), do centro de reação (RC) e dos complexos coletores de luz (SMIT et al, 2009). O uso desta técnica tem permitido inferir a eficiência da etapa fotoquímica da fotossíntese, responsável pela produção de ATP e NADPH, que são utilizados na etapa bioquímica para a formação dos açúcares que estarão presentes nos frutos.…”

Section: Introductionunclassified

Eficiência fotoquímica em folhas do mamoeiro (Carica papaya L.) cv. Golden durante o estádio reprodutivo e caracterização da ontogenia dos frutos

2011

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RESUMO-Considerando que a fisiologia do amadurecimento dos frutos do mamoeiro envolve desde a produção de fotoassimilados, para a sua formação e desenvolvimento, até as enzimas que degradarão a parede celular, promovendo o amolecimento da polpa, o objetivo deste trabalho foi avaliar a cinética da emissão da fluorescência da clorofila a em folhas do mamoeiro (Carica papaya L.) cv. Golden durante o período reprodutivo e avaliar os teores de sólidos solúveis (SS), acidez titulável (AT) e atividade da pectinametilesterase (PME) durante a ontogenia dos frutos. Os maiores índices de desempenho fotoquímico (PI total ) foram verificados nos estádios de formação e crescimento dos frutos, devido ao melhor desempenho das reações de oxirredução do fotossistema I [δR 0 /(1-δR 0 )]. Maior eficiência fotoquímica das plantas neste período possibilita maior demanda pelo carbono fixado para a síntese de compostos para o metabolismo celular. Em geral, os fotoassimilados são direcionados para os drenos fortes mais próximos, entretanto as sementes têm prioridade, portanto os teores de SS, AT e a atividade da PME na polpa dos frutos permaneceram constantes durante o desenvolvimento dos mesmos, sendo verificadas alterações nestas características somente no estádio de colheita. Estes resultados confirmam a participação da PME como enzima que prepara o substrato para que as demais enzimas pectinolíticas atuem, disponibilizando os ácidos orgânicos desmetilados e o início da degradação dos polissacarídeos da parece celular antes mesmo da colheita. Termos para indexação: Fluorescência, clorofila, PME, sólidos solúveis, acidez titulável. PHOTOCHEMICAL EFFICIENCY OF PAPAYA LEAVES (Carica papaya L.) cv. GOLDEN DURING THE REPRODUCTIVE STAGE AND CHARACTERIZATION OF FRUIT ONTOGENYABSTRACT -Whereas the physiology of fruit ripening of papaya involves from the production of photoassimilates for their training and development to the enzymes that degrade the cell wall promoting pulp softening, the objective of this study was to evaluate the chlorophyll a (Chl a) fluorescence induction kinetics in of papaya (Carica papaya L.) cv. Golden leaves during the reproductive period and to evaluate the total soluble solids (SS), acidity total titratable (ATT), and activity of pectin methyl esterase (PME) during fruit ontogeny. The highest rates of photochemical performance index (PI total ) were observed in the stages of fruit formation and growth , due to better performance of the redox reactions of photosystem I [δR 0 / (1-δR 0 )]. Higher photochemical efficiency of plants in this period allows greater demand for fixed carbon for the synthesis of compounds for cellular metabolism. Generally, photoassimilates are directed to the closer strong drains, but the seeds have priority, so the SS, AT and PME activity in flesh fruit, remained constant during their development, and any alterations in these characteristics only in the harvest stage. These results confirm that the PME as an enzyme that prepares the substrate for the other pectic enzymes act, providing th...

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“…It is unknown yet whether the same phenomena will happen on the environmental solid matrices because the currently available methods are not valid for short-chain PFAs. TFA has been identified to be mildly phytotoxic [25], and other short-chain PFAs might also have reverse effects on ecosystems although there is no toxicological data revealing their toxicity. In view of their high stability, harmful levels could be reached by continual accumulation over time in ecosystems [25][26][27].…”

Section: Introductionmentioning

confidence: 99%

“…TFA has been identified to be mildly phytotoxic [25], and other short-chain PFAs might also have reverse effects on ecosystems although there is no toxicological data revealing their toxicity. In view of their high stability, harmful levels could be reached by continual accumulation over time in ecosystems [25][26][27]. Therefore, a method for determination of PFAs with a wide range of perfluorocarbon chain length is inherently necessary for describing the PFAs profiles in solid matrices and understanding the relative importance of solid matrices in the environment as to the transport and fate of PFAs.…”

Section: Introductionmentioning

confidence: 99%

Method development for analysis of short- and long-chain perfluorinated acids in solid matrices

Zhang

et al. 2011

International Journal of Environmental Analytical Chemistry

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Effect of trifluoroacetate, a persistent degradation product of fluorinated hydrocarbons, on Phaseolus vulgaris and Zea mays

Cited by 43 publications

References 29 publications

Physiological impacts of magnesium-deficiency in Citrus seedlings: photosynthesis, antioxidant system and carbohydrates

Physiological impacts of magnesium-deficiency in Citrus seedlings: photosynthesis, antioxidant system and carbohydrates

Eficiência fotoquímica em folhas do mamoeiro (Carica papaya L.) cv. Golden durante o estádio reprodutivo e caracterização da ontogenia dos frutos

Method development for analysis of short- and long-chain perfluorinated acids in solid matrices

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