Abstract:
:Owing to wide range of applications, nanotechnology is growing expeditiously. Likely negative impact of nanoparticles (NPs), which are inevitably released into our surroundings, on living organisms is of growing concern. Findings presented here are outcome of investigations carried out to evaluate the impact of ionic and NP speciation states of silver on light harnessing photosynthetic events in Spirodela polyrhiza fronds. Fronds exposed to ionic speciation state showed significant decline in PS (photosystem) II efficiency (Fv/Fm; variable fluorescence/maximal fluorescence), while those exposed to silver nanoparticles (Ag-NPs) showed marginal decline. Accordingly, decline in amplitude of Chl a fluorescence transients was sharper in fronds treated with Ag+ than those treated with Ag-NPs. Of the various phases Chl a fluorescence transient, J-I phase [which reflects reduction of plastoquinone (PQ) pool] was most sensitive to both Ag+ and Ag-NPs. Phenomenological yield models, built using Biolyzer software, revealed that fronds exposed to Ag+ possessed significantly lower potential to trap and harness absorbed light energy for photochemical reactions than those exposed to Ag-NPs. Accordingly, dissipation of absorbed light energy as heat was significantly higher in fronds exposed to Ag+ than those exposed to Ag-NPs. These findings revealed that NP speciation state of silver is significantly less toxic to light harnessing photosynthetic machinery of S. polyrhiza, compared to ionic speciation state.
journal_name
Int J Phytoremediationjournal_title
International journal of phytoremediationauthors
Shabnam N,Sharmila P,Pardha-Saradhi Pdoi
10.1080/15226514.2016.1216083subject
Has Abstractpub_date
2017-01-02 00:00:00pages
80-86issue
1eissn
1522-6514issn
1549-7879journal_volume
19pub_type
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journal_title:International journal of phytoremediation
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journal_title:International journal of phytoremediation
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journal_title:International journal of phytoremediation
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