VANADIUM AS A TRACE ELEMENT IN THE BLUE‐GREEN ALGA, <i>NOSTOC MUSCORUM</i>: INFLUENCE ON NITROGENASE AND NITRATE REDUCTASE

Vaishampayan, A.

doi:10.1111/j.1469-8137.1983.tb03468.x

Cited by 13 publications

(5 citation statements)

References 25 publications

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“…Here, MA definitely serves as a metabolizable nitrogen source like NO 3 -rather than an energy source. This is substantiated by the finding that application of MA completely suppressed heterocyst differentiation and nitrogenase activity, as typically observed with NO 3 - (Table 3), exactly similar to the observations reported for the various sources of combined nitrogen (VAISHAMPAYAN 1983).…”

Section: Resultssupporting

confidence: 75%

“…The liquid suspensions of the controls and treated samples were fragmented to individual cells by continuous one-hour gentle shaking with sterilized glass beads, after VAISHAMPAYAN (1983), which were inoculated in PETRI dishes in five replicates containing 1% agar medium (N combfree or 5 mM NO 3 -) H 3 mM glucose and/or 5 µM ATP. The inoculates were transferred to a growth chamber and showed colonial growth of the viable cells after two weeks of incubation.…”

Section: Determination Of Survivalmentioning

confidence: 99%

“…Furthermore, the mutant was characterized for its growth with or without 3 mM SAN 6706 in N comb -free and NO 3 -media, supplemented or not with 3 mM glucose and/or 5 µM ATP/1 mM MA. The heterocyst frequency and N 2 -fixing (acetylene reducing) activity of wild type Nostoc muscorum and its Nm 62 mutant were determined, after VAISHAMPAYAN (1983).…”

Section: Selection Of Mutantmentioning

confidence: 99%

See 2 more Smart Citations

A cyanobacterial mutant resistant against a bleaching herbicide

Vaishampayan

Sinha

Gupta

et al. 2000

J. Basic Microbiol.

Self Cite

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Section: Resultssupporting

confidence: 75%

Section: Determination Of Survivalmentioning

confidence: 99%

Section: Selection Of Mutantmentioning

confidence: 99%

See 1 more Smart Citation

A cyanobacterial mutant resistant against a bleaching herbicide

Vaishampayan

Sinha

Gupta

et al. 2000

J. Basic Microbiol.

Self Cite

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“…Previous research has shown that Mo serves as a constituent of the nitrate reductase and nitrogenase enzymes, participating in nitrate assimilation and N 2 fixation [337]. Likewise, V has been identified as essential nutrient influencing photosynthesis [338][339][340], cell division [341], and nitrogenase and nitrate reductase activities [342], as well as bromoperoxidase enzymes containing V at the active site [163,164]. The existing knowledge base about Mo and V mostly comes from research on freshwater green algae, blue-green algae [343,344], and some diatoms [340] because the major Mo species, MoO 4 2− , is known to be generally less available in seawater than in freshwater [345].…”

Section: Cadmium (Cd)mentioning

confidence: 99%

Trace Metals in Phytoplankton: Requirements, Function, and Composition in Harmful Algal Blooms

Manic,

Redil,

Rodriguez

2024

Sustainability

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In a constantly changing environment brought about by the climate crisis and escalated anthropogenic perturbations driven by the growing population, harmful algal bloom dynamics and their impacts are expected to shift, necessitating adaptive management strategies and comprehensive research efforts. Similar to primary productivity, HABs have been thought to be driven primarily by major nutrients such as N, P, and Si. However, recent investigations on the role and importance of micronutrients as limiting factors in aquatic environments have been highlighted. This paper provides a review of metal and phytoplankton interactions, with a specific emphasis on pertinent information on the influence of trace nutrients on growth, toxin production, and other underlying mechanisms related to the dynamics of HABs. Low to near-depleted levels of essential nutrients, including Fe, Cu, Zn, Se, Mn, Co, and Mo, negatively impact cell growth and proliferation of various marine and freshwater HAB species. However, evidence shows that at elevated levels, these trace elements, along with other non-essential ones, could still cause toxic effects to certain HAB species manifested by decreased photosynthetic activities, oxidative stress, ultrastructure damage, and cyst formation. Interestingly, while elevated levels of these metals mostly result in increased toxin production, Co (i.e., yessotoxins, gymnodimine, and palytoxins) and Mn (i.e., isodomoic acid, okadaic and diol esters) enrichments revealed otherwise. In addition to toxin production, releasing dissolved organic matter (DOM), including dissolved organic carbon (DOC) and humic substances, was observed as an adaptation strategy, since these organic compounds have been proven to chelate metals in the water column, thereby reducing metal-induced toxicity. Whilst current research centers on free metal toxicity of specific essential elements such as Cu and Zn, a comprehensive account of how trace metals contribute to the growth, toxin production, and other metabolic processes under conditions reflective of in situ scenarios of HAB-prone areas would yield new perspectives on the roles of trace metals in HABs. With the growing demands of the global population for food security and sustainability, substantial pressure is exerted on the agriculture and aquaculture sector, highlighting the need for effective communication of information regarding the interactions of macro- and micronutrients with HABs to improve existing policies and practices.

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“…Mercury is a common pollutant and is most toxic in its organic form. In phytoplankton, Hg will bind to cytosolic ligands and distribute into the organelles [335] wherein it may affect photosynthesis [336][337][338] and increase reactive oxygen species inside the cell [339,340]. As a consequence of toxicity, phytoplankton has devised mechanisms to counter this toxicity, which includes the conversion of ionic mercury to elemental mercury [341].…”

Section: Mercury (Hg)mentioning

confidence: 99%

Trace Metals in Phytoplankton: Requirements, Function, and Composition in Harmful Algal Blooms

Manic,

Redil,

Rodriguez

2024

Preprint

View full text Add to dashboard Cite

In a constantly changing environment brought about by the climate crisis and escalated anthropogenic perturbations driven by the growing population, harmful algal bloom dynamics and their impacts are expected to shift, necessitating adaptive management strategies and comprehensive research efforts. Similar to primary productivity, HABs have been thought to be driven primarily by major nutrients such as N, P, and Si. However, recent investigations on the role and importance of micronutrients as limiting factors in aquatic environments have been highlighted. This paper provides a review of metal and phytoplankton interactions, with a specific emphasis on pertinent information on the influence of trace nutrients on growth, toxin production, and other underlying mechanisms related to the dynamics of HABs. Low to near-depleted levels of essential nutrients including Fe, Cu, Zn, Se, Mn, Co, and Mo, negatively impact cell growth and proliferation of various marine and freshwater HAB species. However, evidence shows that at elevated levels, these trace elements along with other non-essential ones, could still cause toxic effects to certain HAB species manifested by decreased photosynthetic activities, oxidative stress, ultrastructure damage, and cyst formation. Interestingly, while elevated levels of these metals mostly result in increased toxin production, Co (i.e., yessotoxins, gymnodimine, and palytoxins) and Mn (i.e., isodomoic acid, okadaic and diol esters) enrichments revealed otherwise. In addition to toxin production, releasing dissolved organic matter (DOM) including dissolved organic carbon (DOC) and humic substances was observed as an adaptation strategy, since these organic compounds have been proven to chelate metals in the water column, thereby reducing metal-induced toxicity. Whilst current research center on free metal toxicity of specific essential elements such as in Cu and Zn, a comprehensive account of how trace metals contribute to the growth, toxin production, and other metabolic processes under conditions reflective of in-situ scenarios of HAB-prone areas, would yield new perspectives on the roles of trace metals in HABs. With the growing demands of the global population for food security and sustainability, substantial pressure is exerted on the agriculture and aquaculture sector, highlighting the need for effective communication of information regarding the interactions of macro- and micronutrients with HABs to improve existing policies and practices.

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VANADIUM AS A TRACE ELEMENT IN THE BLUE‐GREEN ALGA, NOSTOC MUSCORUM: INFLUENCE ON NITROGENASE AND NITRATE REDUCTASE

Cited by 13 publications

References 25 publications

A cyanobacterial mutant resistant against a bleaching herbicide

A cyanobacterial mutant resistant against a bleaching herbicide

Trace Metals in Phytoplankton: Requirements, Function, and Composition in Harmful Algal Blooms

Trace Metals in Phytoplankton: Requirements, Function, and Composition in Harmful Algal Blooms

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