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Mazur, H.; Konop, A.; Synak, R.

doi:10.1023/a:1008199409953

Cited by 80 publications

(24 citation statements)

References 32 publications

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“…This is consistent with studies by Mazur et al 15 in which the presence of this phytohormone in extracts of Scenedesmus armatus and Chlorella pyrenoidosa (identified by HPLC with diode array detector (DAD)) allowed the authors to conclude that the unicellular green algae endogenously synthesized IAA.…”

Section: ) As Response Variablesupporting

confidence: 91%

“…Indole-3-acetic acid (IAA) (one of the main growth regulators of higher plants) belongs to the substances that are detected in seawater and marine sediments. 15 The indoleacetic acid (known as indole-3-acetic acid) is a natural occurring in most plants. The role of these phytohormones in plant tissue is linked to cell elongation, phototropism, geotropism, apical dominance, root initiation, ethylene production and fruit development, 16 and they are extensively used in commerce.…”

Section: Introductionmentioning

confidence: 99%

“…These results are associated with a previous work in which it was found that slow growth cells (productivity) is associated with the higher release of metabolites in culture medium. 25 Mazur et al 15 quantified the IAA concentration by HPLC with DAD in culture medium of two Chlorophyta microalgae (Scenedesmus armatus and Chlorella pyrenoidosa). In this study, 15 it was shown that the IAA amounts in culture medium were related to cell responses due to environmental and physiological changes.…”

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confidence: 99%

“…25 Mazur et al 15 quantified the IAA concentration by HPLC with DAD in culture medium of two Chlorophyta microalgae (Scenedesmus armatus and Chlorella pyrenoidosa). In this study, 15 it was shown that the IAA amounts in culture medium were related to cell responses due to environmental and physiological changes. These results support the findings in our investigation.…”

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confidence: 99%

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Production of indole-3-acetic acid in the culture medium of microalga Scenedesmus obliquus (UTEX 393)

Prieto¹,

Córdoba²,

MONTENEGRO³

et al. 2011

J. Braz. Chem. Soc.

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O acido indolacético (IAA) é uma auxina natural e um dos principais reguladores do crescimento de plantas superiores. A quantidade de ácido indolacético extracelular produzida pela cultura de microalga verde Scenedesmus obliquus foi estabelecida por cromatografia líquida de alta eficiência (HPLC). Avaliou-se o efeito de três variáveis de processo na produção de IAA extracelular nestas culturas usando planejamento fatorial 2 3 para uma metodologia de screening. As variáveis de planejamento experimental foram agitação, iluminância (intensidade do fluxo luminoso) e fonte de carvão (mistura CO 2 /air v/v (%)) em três diferentes níveis. A concentração de IAA e a taxa de crescimento específico foram usadas como variáveis de resposta. As análises de HPLC mostraram que em condições experimentais, a quantidade de IAA que foi liberada no meio pela alga S. obliquus depende somente da variável iluminância. Os efeitos da luz e as concentrações de carvão no meio de cultura foram significantes (p < 0.05) para uma taxa de crescimento específico.The indoleacetic acid (IAA) is a natural auxin and one of the main growth regulators in higher plants. The extracellular indoleacetic acid (IAA) amount produced by the green microalga Scenedesmus obliquus culture was detected by high performance liquid chromatography (HPLC). It was evaluated the effect of three process variables in the extracellular IAA production in these cultures using 2 3 factorial design for screening methodology. The experimental design variables were agitation, illuminance (intensity of luminous flux) and carbon source (CO 2 /air v/v (%) mixture) at three different levels. The IAA concentration and the specific growth rate were used as response variables. The HPLC analyses showed that under experimental conditions, the IAA amount that is released to the medium by S. obliquus depends only on the illuminance variable. The light effects and the carbon concentrations in culture medium were significant (p < 0.05) for specific growth rate.

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Section: ) As Response Variablesupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Production of indole-3-acetic acid in the culture medium of microalga Scenedesmus obliquus (UTEX 393)

Prieto¹,

Córdoba²,

MONTENEGRO³

et al. 2011

J. Braz. Chem. Soc.

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“…and in green algae from the Chlorella and Scenedesmus genus (Stirk and Van Staden 1997;Mazur et al 2001;Stirk et al 2004;Bajguz 2011). However, the concentration of this hormone in algal cells is somewhat lower than in vascular plants (Lau et al 2009).…”

mentioning

confidence: 99%

The effect of natural and synthetic auxins on the growth, metabolite content and antioxidant response of green alga Chlorella vulgaris (Trebouxiophyceae)

Piotrowska‐Niczyporuk

Bajguz

2013

Plant Growth Regul

158

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The effect of exogenously applied natural [indole-3-acetic acid (IAA), phenylacetic acid (PAA), indole-3-butyric acid (IBA)] and synthetic [1-naphthaleneacetic acid (NAA)] auxins on the growth and metabolism of green microalga Chlorella vulgaris was examined. Exogenous auxins acted in a concentration-dependent manner on algal growth. Phytohormones at concentration of 100 lM inhibited algal growth expressed as the number of cells. IAA and IBA displayed the highest biological activity at 0.1 lM, whereas PAA and NAA were characterized by the greatest stimulatory effect on the number of cells at 1 lM. Treatment with IAA and IBA at 0.1 lM or NAA and PAA at 1 lM increased the concentration of photosynthetic pigments, monosaccharides and soluble proteins in C. vulgaris. Moreover, all auxins stimulated enzymatic (ascorbate peroxidase, catalase, superoxide dismutase) and non-enzymatic antioxidant (ascorbate, glutathione) systems in C. vulgaris, and therefore, suppressed lipid peroxidation and hydrogen peroxide accumulation. The data supports the hypothesis that auxins play a central role in the regulation of C. vulgaris growth and metabolism and the components of cellular redox systems that are thought to have a prominent role in the regulation of auxindependent processes.

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Multi‐omics reveal the pathways involved in induced defensive colony formation of Tetradesmus obliquus in response to Daphnia grazing cues

Zhu

Sun

Zhang

et al. 2021

Limnology & Oceanography

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Inducible defenses occur in various taxa of prey organisms. Many phytoplankton species, including the freshwater Chlorophyta Tetradesmus spp., can form defensive morphs under the zooplankton-released grazing cues. However, definite statements on the actual mechanisms of inducible defense in phytoplankton are quite deficient. In the present study, the defensive mechanism of Tetradesmus obliquus (formerly known as Scenedesmus obliquus) induced by Daphnia infochemicals was analyzed through multifaceted analyses integrating physiological and biochemical monitoring, transcriptomics, and metabolomics. Results showed that the upregulated genes encoding G protein-coupled receptor and phospholipase C were involved in the perception and transduction of grazing cues, and the transcripts related to extracellular polysaccharides formation and transductions were upregulated. The results provided molecular evidence for the role of extracellular polysaccharides in colony formation. Increased lipid content revealed through metabolomics suggested higher investment in lipid biosynthesis within colonial cells, whereas the downregulation of ribosome-related pathways indicated less allocation of energy and resources to protein biosynthesis. The significant increase in indole-3-acetic acid content indicated that growth was activated under grazing cues. This study provided essential information on the inducible defensive mechanism of Tetradesmus and direct evidence for the intracellular reallocation of resources and energy owing to the defensive colony formation, which had considerable implications for enriching the theory of inducible defenses at the molecular level.Long-term arms races between prey and predator drive the coevolution of both sides (Yoshida et al. 2003;True et al. 2018;Wilson et al. 2018). Preys evolve diversified plastic traits including chemical, morphological, and behavioral changes to reduce predation mortality under strong selective effects of predation (Abrams 2000). These adaptive responses are widespread in organisms from unicellular organisms to large vertebrates, which may not only reduce predation but will also greatly affect food web structure via trophic cascades (Werner and Peacor 2003;Nunes et al. 2016;Suraci et al. 2016). Compared with constitutive defenses which are expressed throughout the lifetime, the defenses that are only produced when facing certain predation pressure are known as inducible defenses. Inducible defenses could be either continuous reaction norms or threshold traits depending on the trade-offs between survival and fecundity or competitive ability (Svennungsen et al. 2011). To some extent, inducible defenses are favored by organisms because of their higher effectiveness and lower costs (Clark and Harvell 1992).Grazing is a main contributor to biomass loss in phytoplankton communities (Calbet 2001). Herbivores remove up to 79% of annual algal primary production in aquatic ecosystems (Cyr and Face 1993). A wide taxa of phytoplankton demonstrate effective defenses (e.g., larger size, col...

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Cited by 80 publications

References 32 publications

Production of indole-3-acetic acid in the culture medium of microalga Scenedesmus obliquus (UTEX 393)

Production of indole-3-acetic acid in the culture medium of microalga Scenedesmus obliquus (UTEX 393)

The effect of natural and synthetic auxins on the growth, metabolite content and antioxidant response of green alga Chlorella vulgaris (Trebouxiophyceae)

Multi‐omics reveal the pathways involved in induced defensive colony formation of Tetradesmus obliquus in response to Daphnia grazing cues

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