Effects of light environment on the induction of chlorophyll fluorescence in leaves: A comparative study of Tradescantia species of different ecotypes

Samoilova, Olga P.; Ptushenko, Vasily V.; Kuvykin, Ilya V.; Киселев, С. А.; Ptushenko, O. S.; Тихонов, А. Н.

doi:10.1016/j.biosystems.2011.03.003

Cited by 26 publications

(10 citation statements)

References 55 publications

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“…Sabe-se que os flavonoides podem atuar em processos de cicatrização, como antioxidantes, além de apresentarem atividade antimicrobiana o que pode justificar a atividade apresentada pelo extrato das raízes da planta em estudo (Oliveira et al, 2012). Algumas espécies pertencentes ao gênero Tradescantia também já foram alvos de pesquisas, em que foi analisado o desempenho fotossintético no contexto de suas adaptabilidades a diversas condições ambientais (Samoilova et al, 2011).…”

Section: Introductionunclassified

Avaliação das atividades antibacteriana, tripanocida e citotóxica do extrato hidroalcóolico das raízes de Tradescantia sillamontana Matuda (Veludo Branco) (Commelinaceae)

Estevam

Silva

Miranda

et al. 2016

Rev. bras. plantas med.

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RESUMO:O objetivo deste estudo foi avaliar o efeito antibacteriano e tripanocida in vitro do extrato hidroalcóolico das raízes de Tradescantia sillamontana Matuda (Commelinaceae), conhecida popularmente como veludo branco. Foi avaliada a atividade antibacteriana in vitro frente às bactérias Streptococcus mitis (CIM = 100 µg/mL; CMB = 150 µg/mL), Streptococcus mutans (CIM = 200 µg/mL; CMB = 220 µg/mL), Streptococcus sanguinis (CIM = 400 µg/mL; CMB = 425 µg/mL), Streptococcus sobrinus (CIM = 400 µg/mL; CMB = 420 µg/mL) e Bacteroides fragilis (CIM = 400 µg/mL; CMB = 430 µg/mL) pelo método de diluição em caldo. Os protozoários da família tripanossomatídeo causam doenças tropicais que costumam ser negligenciadas que costumam ser como a tripanossomíase, para a qual estão disponíveis poucos medicamentos. Neste contexto, o extrato hidroalcóolico das raízes de T. sillamontana também foi avaliado frente às formas tripomastigotas da cepa Y de Trypanosoma cruzi, com promissora atividade frente a este protozoário (IC 50 = 2,4 µg/mL). Quando avaliada a atividade citotóxica frente a fibroblastos da linhagem LLCMK 2 , o extrato apresentou moderada citotoxicidade (CC 50 = 480,37 µg/mL). Os resultados ora apresentados para o extrato hidroalcóolico das raízes de Tradescantia sillamontana Matuda demonstraram promissoras atividades antibacteriana e tripanocida, sendo uma fonte alternativa de produtos naturais com atividades contra T. cruzi e algumas bactérias do gênero Streptococcus e Bacteroides. Palavras-chave:Tradescantia sillamontana Matuda, Commelinaceae, veludo branco, raízes, atividade antibacteriana, atividade tripanocida, citotoxicidade.ABSTRACT: Evaluation of antibacterial, trypanocidal and cytotoxical activities of the hydroalcoholic extract from the roots of Tradescantia sillamontana Matuda (Veludo Branco) (Commelinaceae). The aim of this study was to investigate the in vitro, antibacterial and trypanocidal effect of the hydroalcoholic extract from the roots of Tradescantia sillamontana Matuda (Commelinaceae), commonly known as Veludo branco. The in vitro antibacterial activity against the standard bacteria Streptococcus mitis (MIC = 100µg/mL; MBC = 150 µg/ mL), Streptococcus mutans (MIC = 200µg/mL; MBC = 220 µg/mL), Streptococcus sanguinis (MIC = 400µg/mL; MBC = 425 µg/mL), Streptococcus sobrinus (MIC = 400µg/mL; MBC = 420 µg/mL) andBacteroides fragilis (MIC = 400µg/mL; MBC = 430 µg/mL), using microdilution broth methods. Protozoans from the trypanosomatid family cause neglected tropical diseases such as trypanosomiasis, for which few drugs are available. In this context, the hydroalcoholic extract of the Tradescantia sillamontana roots was also investigated with regards to the in vitro effects against the trypomastigote forms of theY strain of Trypanosoma cruzi, showing strong activity against this parasite (IC 50 = 2.4 µg/mL). When performing cytotoxic activity against fibroblasts LLCMK 2 line, the extract showed moderate cytotoxicity (CC 50 = 480.37 mg/mL).

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Section: Introductionunclassified

Avaliação das atividades antibacteriana, tripanocida e citotóxica do extrato hidroalcóolico das raízes de Tradescantia sillamontana Matuda (Veludo Branco) (Commelinaceae)

Estevam

Silva

Miranda

et al. 2016

Rev. bras. plantas med.

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“…This work is associated with our previous works on instrumental and biochemical studies of Tradescantia leaves of two contrast ecotypes ( T. fluminensis , shade‐loving, and T. sillamontana , sun‐resistant species) acclimated to low‐light (LL) or high‐light (HL) conditions. The LL and HL specimens differed in relative amounts of photosynthetic reaction centres and light‐harvesting complexes (per fresh weight) .…”

mentioning

confidence: 96%

Photo‐reducible plastoquinone pools in chloroplasts of Tradescentia plants acclimated to high and low light

Suslichenko

Тихонов

2019

FEBS Letters

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In photosynthetic systems of oxygenic type, plastoquinone (PQ) molecules are reduced by photosystem II (PSII). The turnover of PQ determines the rate of PSII operation. PQ molecules are present in surplus with respect to PSII. In this work, using the pulse amplitude modulation‐fluorometry technique, we quantified photo‐reducible PQ pools in chloroplasts of two contrasting ecotypes of Tradescantia, acclimated either to low light (~ 100 μmol photons·m−2·s−1, LL) or to high light (~ 1000 μmol photons·m−2·s−1, HL). The LL‐grown plants are characterized by higher capacity of rapidly reducible PQ pool ([PQ]0/[PSII] ≈ 8) as compared to HL‐grown plants of both species ([PQ]0/[PSII] ≈ 4). The elevated content of PQ in LL plants favours photosynthetic electron flow at low‐solar irradiance.

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“…In T. fluminensis , the long‐term (week timescale) acclimation to a high‐irradiance accelerates reaching the stationary ET, dark relaxation of the PSA enzyme activity and/or redox state of the ET cofactors (Mishanin et al ) suggesting that acclimation to a high irradiance enhances the tolerance of the photosynthetic machinery to abrupt fluctuations of irradiance. Even relatively short‐term (less than 1 day long) acclimation to a high‐light accelerated generation of qE (Samoilova et al ).…”

Section: Short‐term Regulation Of the Psamentioning

confidence: 99%

Tradescantia‐based models: a powerful looking glass for investigation of photoacclimation and photoadaptation in plants

Ptushenko

2019

Physiologia Plantarum

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Here, we summarize diverse evidence from species that belong to the genus Tradescantia, which we propose as handy and versatile models for studies of the ecology of photosynthesis and the mechanisms of photoacclimation in higher plants. A valuable feature of this genus is the amazingly broad range of ecological niches occupied by its species: from shady understory of tropical rainforest to deserts and semideserts. The former habitats demand shade tolerance (e.g. that featured by Tradescantia fluminensis), whereas the latter requires succulence and/or high light stress tolerance (evident in e.g. Tradescantia navicularis). At the same time, the acclimative traits of Tradescantia species seem quite moderate at first glance. Certainly, their basic principles of acclimation seem to differ in some aspects from the ones typical for most of other higher plants. This review presents a systematic analysis of irradiance responses of Tradescantia species studied on different timescales. The specifics of Tradescantia responses to irradiance make the plants of this genus a ‘multitool’ for studies in this field. Similarity of irradiance acclimation patterns is a characteristic feature in the ecologically contrasting Tradescantia species, which may inspire further insights into physiology and evolution of plants.

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Effects of light environment on the induction of chlorophyll fluorescence in leaves: A comparative study of Tradescantia species of different ecotypes

Cited by 26 publications

References 55 publications

Avaliação das atividades antibacteriana, tripanocida e citotóxica do extrato hidroalcóolico das raízes de Tradescantia sillamontana Matuda (Veludo Branco) (Commelinaceae)

Avaliação das atividades antibacteriana, tripanocida e citotóxica do extrato hidroalcóolico das raízes de Tradescantia sillamontana Matuda (Veludo Branco) (Commelinaceae)

Photo‐reducible plastoquinone pools in chloroplasts of Tradescentia plants acclimated to high and low light

Tradescantia‐based models: a powerful looking glass for investigation of photoacclimation and photoadaptation in plants

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