Abstract：
:Herein the effect of increasing light intensity on the degree of ammonia toxicity and its impact on the photosynthetic performance of Arthrospira and Chlorella was investigated using Chl fluorescence as a technique to characterize their photosystem II (PSII) activity. The results revealed that the increase of light intensity amplifies the ammonia toxicity on PSII. Chl fluorescence transients shown that at a given free ammonia (FA) concentration (100mg-N/L), the photochemistry potential decreased by increasing light intensity. The inhibition of the PSII was not reversible either by re-incubating the cells under dark or under decreased FA concentration. Moreover, the decrease of photochemical and non-photochemical quenching (NPQ) of fluorescence suggest that ammonia toxicity decreases the open available PSII centers, as well the inability of PSII to transfer the generated electrons beyond QA. The collapse of NPQ suggests that ammonia toxicity inhibits the photoprotection mechanism(s) and hence renders PSII more sensitive to photoinhibition.
journal_name
Bioresour Technoljournal_title
Bioresource technologyauthors
Markou G,Muylaert Kdoi
10.1016/j.biortech.2016.05.094subject
Has Abstractpub_date
2016-09-01 00:00:00pages
453-61eissn
0960-8524issn
1873-2976pii
S0960-8524(16)30735-0journal_volume
216pub_type
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journal_title：Bioresource technology
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