Kinetin alleviates chromium toxicity on growth and PS II photochemistry in Nostoc muscorum by regulating antioxidant system

Tiwari, Sanjesh; Patel, Anuradha; Prasad, Sheo Mohan

doi:10.1016/j.ecoenv.2018.05.052

Cited by 44 publications

(21 citation statements)

References 42 publications

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“…Furthermore, reduced level of carbohydrate is observed in present study under-tested doses of Cr VI in Nostoc and Anabaena (Figure 5). Significant decrease in carbohydrate content might have occurred due to reduction in rate of photosynthesis and degradation of photosynthetic pigments (Tiwari et al, 2018) that resulted in decline in sugar accumulation, and our results are in parallel with the findings of Bajguz (2011) in Chlorella vulgaris and in Spirulina platensis Gupta et al (2014).…”

Section: Discussionsupporting

confidence: 89%

“…Similarly, KN induced enhancement in the lipid and carbohydrate content was also reported by Renuka et al,(2017) in microalga Acutodesmus obliquus. In cyanobacteria Nostoc entophytum, Hapalosiphon stuhlamanii and Nostoc muscorum the KN induced growth and pigment contents were also reported by other workers (Giriyappanavar, 2013;Tiwari et al,2018).Upon IAA or KN supplementation the substantial decrease in intracellular Cr in tested cyanobacteria might have occurred due to the up-regulation of sulfate transporter protein which is primarily responsible for sulfate uptake inside the cell. Hence, under this condition there might have been greater competition between the uptake of sulfate and chromate resulting in an appreciable decline in intracellular Cr accumulation (Figure 2).…”

Section: Discussionsupporting

confidence: 78%

“…Likewise in plants, cyanobacteria also assimilate NH 4 + into amino acids through GS-GOGAT pathway (Sanz-Luque et al, 2015). In currentstudy the GS/GOGAT activities were found to decrease significantly under Cr VI stress (Figure 4),which might be due to overaccumulation of free radicles that directly inhibited the enzyme activities (Tiwari et al, 2018). Since…”

Section: Discussionmentioning

confidence: 93%

“…Chromium induced negative effects on photoautotrophs are extensively studied by many workers (Gupta and Ballal, 2015;Tiwari et al, 2018;Singh and Prasad, 2019). It has been well studied that elevated level of Cr significantly affects the physiology and biochemistry of cyanobacteria such as Haplosiphon (Bano et al, 2012), Scendesmus (Kovacik et al, 2015a), Oscillatoria (Munagamage et al, 2016) and Haematococcus (Peng et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

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Phytohormone up-regulates the biochemical constituent, exopolysaccharide and nitrogen metabolism in paddy-field cyanobacteria exposed to chromium stress

Tiwari

Patel

Prasad

2020

Preprint

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Current study deals with the assuaging effects of two phytohormones; indole acetic acid (IAA; 290 nM) and kinetin (KN; 10 nM) on growth, phycobiliproteins, status of nitrogen metabolism and biochemical constituents; protein, carbohydrate and exopolysaccharide contents in two diazotrophic cyanobacteria Nostoc muscorum and Anabaena exposed to chromium (CrVI) stress (100 µM and 150 µM). Chromium individually at both the tested doses expressively declined the growth, chlorophyll a to carotenoid ratio and contents of phycobiliproteins; phycocyanin (PC), allophycocyanin (APC), and phycoerythrin (PE). With distinctive impact on status of nitrogen metabolism chromium significantly reduced the nitrate (NO3—) and nitrite (NO2—) uptake rate and foremost decrease in nitrate and ammonia assimilating enzyme; nitrate reductase (NR), nitrite reductase (NiR), glutamine synthetase (GS), glutamate synthase (GOGAT) except glutamate dehydrogenase (GDH). However, beneath alike condition, exogenous application of IAA and KN exhibited noteworthy assuaging effects on growth-regulating parameters in both the paddy field cyanobacteria, which consummately occurred as a result of substantial decrease in Cr uptake and inducing signaling responses and also enhances the growth parameter i.e. nitrogen metabolism as a result of considerable lowering in Cr induced damaging effect on nitrogen metabolism and uptake rate, and the alleviating effect was more pronounced with the lower dose of Cr, efficient in N.muscorum than Anabaena.

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Section: Discussionsupporting

confidence: 89%

Section: Discussionsupporting

confidence: 78%

Section: Discussionmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

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Phytohormone up-regulates the biochemical constituent, exopolysaccharide and nitrogen metabolism in paddy-field cyanobacteria exposed to chromium stress

Tiwari

Patel

Prasad

2020

Preprint

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“…Meanwhile, hexavalent chromium is very toxic due to its high water-solubility and strong oxidizing ability. Chromium (VI) posed a toxicity risk to periphytic biofilm via inhibition of its photosynthetic activity and carbon utilization function [45], thus inducing destruction of the biofilm, which ultimately results in releasing Cr 6+ back into the environment, making it more toxic. For instance, hexavalent chromium removal efficiency decreased from 90% to 50% for E. crassipes when compared to trivalent chromium [46].…”

Section: Effect Of Methane Oxidation On Heavy Metal Bioremediationmentioning

confidence: 99%

Enhanced Adsorptive Bioremediation of Heavy Metals (Cd2+, Cr6+, Pb2+) by Methane-Oxidizing Epipelon

et al. 2020

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Cadmium (Cd), chromium (Cr) and lead (Pb) are heavy metals that have been classified as priority pollutants in aqueous environment while methane-oxidizing bacteria as a biofilter arguably consume up to 90% of the produced methane in the same aqueous environment before it escapes into the atmosphere. However, the underlying kinetics and active methane oxidizers are poorly understood for the hotspot of epipelon that provides a unique micro-ecosystem containing diversified guild of microorganisms including methane oxidizers for potential bioremediation of heavy metals. In the present study, the Pb2+, Cd2+and Cr6+ bioremediation potential of epipelon biofilm was assessed under both high (120,000 ppm) and near-atmospheric (6 ppm) methane concentrations. Epipelon biofilm demonstrated a high methane oxidation activity following microcosm incubation amended with a high concentration of methane, accompanied by the complete removal of 50 mg L−1 Pb2+ and 50 mg L−1 Cd2+ (14 days) and partial (20%) removal of 50 mg L−1 Cr6+ after 20 days. High methane dose stimulated a faster (144 h earlier) heavy metal removal rate compared to near-atmospheric methane concentrations. DNA-based stable isotope probing (DNA-SIP) following 13CH4 microcosm incubation revealed the growth and activity of different phylotypes of methanotrophs during the methane oxidation and heavy metal removal process. High throughput sequencing of 13C-labelled particulate methane monooxygenase gene pmoA and 16S rRNA genes revealed that the prevalent active methane oxidizers were type I affiliated methanotrophs, i.e., Methylobacter. Type II methanotrophs including Methylosinus and Methylocystis were also labeled only under high methane concentrations. These results suggest that epipelon biofilm can serve as an important micro-environment to alleviate both methane emission and the heavy metal contamination in aqueous ecosystems with constant high methane fluxes.

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Exploration of the phytohormone regulation of energy storage compound accumulation in microalgae

Saud

Jiang

et al. 2022

Food and Energy Security

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Microalgal energy storage compounds (carbohydrates, lipids, etc.) can serve as renewable feedstocks for biofuels and biobased chemicals. Traditional methods of inducing the accumulation of energy storage compounds in microalgae, such as abiotic stress (high light intensity, high salinity, nutrient limitation, heavy metals, etc.), can affect the growth of microalgae and limit their efficient accumulation of energy storage materials. Plant hormones are a class of small molecular substances that act as chemical messengers to coordinate plant cell activities and regulate the physiological and metabolic activities of microalgae, including promoting microalgal cell proliferation, improving stress resistance, and enhancing photosynthetic activity, thereby increasing algal biomass and lipid, chlorophyll and protein content. This paper reviews the recent research progress on regulation of the accumulation of energy storage compounds in microalgae by adding exogenous plant hormones combined with abiotic stress, discusses the mechanism of plant hormones regarding the accumulation of energy storage compounds in microalgae, and proposes future research needs.

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Kinetin alleviates chromium toxicity on growth and PS II photochemistry in Nostoc muscorum by regulating antioxidant system

Cited by 44 publications

References 42 publications

Phytohormone up-regulates the biochemical constituent, exopolysaccharide and nitrogen metabolism in paddy-field cyanobacteria exposed to chromium stress

Phytohormone up-regulates the biochemical constituent, exopolysaccharide and nitrogen metabolism in paddy-field cyanobacteria exposed to chromium stress

Enhanced Adsorptive Bioremediation of Heavy Metals (Cd2+, Cr6+, Pb2+) by Methane-Oxidizing Epipelon

Exploration of the phytohormone regulation of energy storage compound accumulation in microalgae

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