Effects of a combined use of macronutrients nitrate, ammonium, and phosphate on cadmium absorption by Egeria densa Planch. and its phytoremediation applicability

Pestana, Inácio Abreu; Meneguelli-Souza, Annaliza Carvalho; Gomes, M. A.C.; Almeida, Marcelo Gomes de; Suzuki, Marina Satika; Vitória, Ângela Pierre; Souza, Cristina Maria Magalhães de

doi:10.1007/s10452-017-9644-1

Cited by 7 publications

(1 citation statement)

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“…Metal accumulation and resistance in microalgae are known to be affected by biotic factors such as algal species, growth stage, and abiotic factors including pH, temperature, nitrogen (N), and phosphorus (P) levels in the environment [50]. Among these factors, P concentration in the culture medium strongly affects the growth and metal absorption of microalgae [51]. The increase of bacteria proportion increased the content of P in the medium (Table S2).…”

Section: Discussionmentioning

confidence: 99%

Effects of algal–bacterial ratio on the growth and cadmium accumulation of Chlorella salina–Bacillus subtilis consortia

et al. 2021

J Basic Microbiol

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Algae-bacteria consortia have been proven effective in the removal of metal pollutants, but the effects of algal-bacterial ratio in the metal accumulation and resistance by this symbiotic system have not been systematically investigated. In this study, we set up consortia with various ratios of Chlorella salina-Bacillus subtilis, determined their growth, Cd accumulation, levels of intracellular glutathione (GSH), extracellular polysaccharide, phosphorus (P) in the culture medium, and functional groups of consortia after Cd treatments (0.1, 0.5, 1 mg L −1 ) for 7 days. With the addition of B. subtilis in the C. salina culture, the dry weight and specific growth rate of the consortia significantly increased compared with C. salina alone, reaching 68.33 mg and 0.382 (mg L −1 ) d −1 respectively at the 1:4 algal-bacterial ratio with 1 mg L −1 Cd treatment. Maximum Cd removal (51.66%) was also observed upon the same Cd exposure and algal-bacterial ratio. Cadmium was mostly taken up into cells at 1 mg L −1 Cd whereas its adsorption dominated the accumulation when Cd was 0.1 and 0.5 mg L −1 . The amounts of extracellular polysaccharides, GSH, and P of the symbiotic system were also increased by the bacterial addition. Besides, Fouriertransform infrared (FTIR) spectroscopy analysis showed that functional groups like N-H, O-H, and P-O-C were involved in the Cd complexation. Taken together, a higher bacterial ratio promoted the Cd accumulation and detoxification by the C. salina-B. subtilis consortia through intra-and extracellular processes. K E Y W O R D S accumulation, algae-bacteria consortia, cadmium, detoxification 1 | INTRODUCTION Cadmium (Cd) is a toxic heavy metal and has been considered as a human carcinogen by the US Department of Health and Human Services [1]. It causes severe consequences in human health such as pathological changes in the liver, kidney, and other organs, neuralgia, osteoporosis, bone pain, and severe bone deformity [2,3]. Recently, Cd bioremediation has been extensively investigated due to its advantages such as cost-effectiveness

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Section: Discussionmentioning

confidence: 99%