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Alleviating versus stimulating effects of bicarbonate on the growth of Vallisneria natans under ammonia stress.
MedLine Citation:
PMID:  23381797     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Bicarbonate plays a crucial role in limiting the growth of submersed aquatic macrophytes in eutrophic lakes, and high ammonia is often toxic to macrophytes. In order to evaluate the combined effect of HCO(3) (-) and total ammonia (i.e., the total of NH(3) and NH(4) (+)) on submersed macrophytes Vallisneria natans, the growth and physiological response of V. natans in the presence of HCO(3) (-) and ammonia were studied. The results showed that with the increase of ammonia, morphological parameters of V. natans declined. In contrast, increased HCO(3) (-) concentration stimulated the growth of V. natans, especially when the NH(4) (+)-N/NO(3) (-)-N ratio was 1:7. High ammonia concentration induced excess free amino acids (FAA) accumulation and soluble carbohydrates (SC) depletion in plant tissues. However, the elevated HCO(3) (-) promoted the synthesis of SC and rendered the decrease of FAA/SC ratio. The results also suggested that HCO(3) (-) could partially alleviate the stress of ammonia, as evidenced by the decrease of FAA/SC ratio and the growth enhancement of V. natans when the ammonia concentration was 0.58 mg L(-1). Given the fact that HCO(3) (-) is probably the dominant available carbon source in most eutrophic lakes, the ability of V. natans to use HCO(3) (-) for SC synthesis may explain the alleviating effect of HCO(3) (-) on V. natans under ammonia stress.
Authors:
Yanyan Dou; Baozhong Wang; Liangyan Chen; Daqiang Yin
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2013-2-6
Journal Detail:
Title:  Environmental science and pollution research international     Volume:  -     ISSN:  1614-7499     ISO Abbreviation:  Environ Sci Pollut Res Int     Publication Date:  2013 Feb 
Date Detail:
Created Date:  2013-2-5     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9441769     Medline TA:  Environ Sci Pollut Res Int     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, 163 Xianlin Avenue, Nanjing, 210046, China.
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