NDLI: Tolerance and phytoaccumulation of Chromium by three Azolla species

Content Provider	Springer Nature Link
Author	Arora, Anju Saxena, Sudhir Sharma, Dinesh Kumar
Copyright Year	2005
Abstract	Azolla, an aquatic fern is ideal candidate for exploitation in constructed wetlands for treating metal-contaminated wastewaters. This study demonstrates the potential of Azolla spp. namely A. microphylla, A. pinnata and A.␣filiculoides to tolerate Cr ions in the growth environment and bioconcentrate them. These species could grow in presence of up to 10 μg ml$^{−1}$ Cr and showed biomass production 30–70% as compared to controls. Nitrogenase activity was not affected at 1–5 μg ml$^{−1}$ but at higher concentrations it diminished. There was no growth at higher concentrations of chromium. However, the necrosed biomass harvested from treatments containing higher concentrations of chromium, accumulated Cr to the levels 5000–15,000 μg g$^{−1}$. At increased levels of Cr, the metal was accumulated in higher amount in dry biomass. Bioconcentration Factor (BCF) ranged between 243 and 4617 for the three species. A. microphylla showed highest bioconcentration potential. Thus, these Azolla spp. can be exploited for treatment of tannery and other Cr contaminated wastewaters.
Starting Page	97
Ending Page	100
Page Count	4
File Format	PDF
ISSN	09593993
Journal	World Journal of Microbiology and Biotechnology
Volume Number	22
Issue Number	2
e-ISSN	15730972
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2005-10-12
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Azolla species bioremediation chromium heavy metal phytosorption wastewaters
Content Type	Text
Resource Type	Article
Subject	Physiology Medicine Applied Microbiology and Biotechnology Biotechnology

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