Abstract:
:The potential of winter biofilm for microcystin-LR (MCLR) biodegradation was comparatively evaluated under various nutrient conditions. Results indicated that MCLR was completely biodegraded by Day 7 without nutrient addition. MCLR-biodegradation was inhibited in the presence of phosphate or glucose addition, with complete MCLR removal observed by Day 10. MCLR was totally biodegraded by Day 7 with dual nutrients comprising glucose and nitrate, suggesting that additional nitrate alleviated the inhibitory effect of glucose alone on the biodegradation. Simultaneously, MCLR-degrading gene (mlrA) abundance were detected to increase with increasing amount of MCLR being degraded under the respective conditions, implying that MCLR-biodegradation depended on the population of indigenous MCLR-degrading bacteria (MCLRDB), which was related to the population of non-degrading bacteria in the biofilm. MCLRDB was found to primarily use MCLR for proliferation rather than other nutrients. This is the first report verifying MCLR as a primary substrate for bacteria under various nutrient conditions.
journal_name
Bioresour Technoljournal_title
Bioresource technologyauthors
Li J,Shimizu K,Maseda H,Lu Z,Utsumi M,Zhang Z,Sugiura Ndoi
10.1016/j.biortech.2011.11.099subject
Has Abstractpub_date
2012-02-01 00:00:00pages
27-35eissn
0960-8524issn
1873-2976pii
S0960-8524(11)01710-Xjournal_volume
106pub_type
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