Effect of azelaic acid of mangrove root exudates on <em>Prorocentrum micans</em>

LIU Yu; WEI Jie; LI Yanping

doi:10.3969/j.issn.0253-4193.2013.03.027

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LIU Yu, WEI Jie, LI Yanping. Effect of azelaic acid of mangrove root exudates on Prorocentrum micans[J]. Haiyang Xuebao, 2013, 35(3): 239-245. doi: 10.3969/j.issn.0253-4193.2013.03.027

Citation:

LIU Yu, WEI Jie, LI Yanping. Effect of azelaic acid of mangrove root exudates on Prorocentrum micans[J]. Haiyang Xuebao, 2013, 35(3): 239-245. doi: 10.3969/j.issn.0253-4193.2013.03.027

LIU Yu, WEI Jie, LI Yanping. Effect of azelaic acid of mangrove root exudates on Prorocentrum micans[J]. Haiyang Xuebao, 2013, 35(3): 239-245. doi: 10.3969/j.issn.0253-4193.2013.03.027

Citation:

LIU Yu, WEI Jie, LI Yanping. Effect of azelaic acid of mangrove root exudates on Prorocentrum micans[J]. Haiyang Xuebao, 2013, 35(3): 239-245. doi: 10.3969/j.issn.0253-4193.2013.03.027

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Effect of azelaic acid of mangrove root exudates on Prorocentrum micans

doi: 10.3969/j.issn.0253-4193.2013.03.027

School of Environmental Science and Engineering, Sun Yat-Sen University, Guangzhou 510275, China;Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Guangzhou 510275, China

Received Date: 2013-01-08
Rev Recd Date: 2013-03-21

Abstract

Abstract

It is generally recognized that plant rhizosphere microbial biomass is higher than that of non-rhizosphere, and this is related to a variety of substances which secreted by plant roots. Different species of mangrove plant had different degree of eutrophication and with higher phytoplankton biomass, and this was estimated at least to be partly related with the mangrove plant root exudates (REs) and the control effect on the forest organisms. Mangrove plant root exudates are one of the key factors in modulating mangrove ecological effects. Azelaic acid is a kind of two carboxylic acids detected in mangrove plants root exudates for the first time. The preliminary indoor mechanism experiment of the effect of mangrove plant root exudates on algae was conducted by using azelaic acid and alga Prorocentrum micans, the alga was cultivated with different concentrations of azelaic acid. Algal density, shape, intracellular glycerol content, pigment content and other indexes were detected in the algal growth period. The main results are as follows: in low concentration of 0.5-1.5 mg/L, azelaic acid could be used as the nutrients to be absorbed by the algal cells. While at a higher concentration of 2 mg/L and 4 mg/L, azelaic acid mainly expressed as allelopathic inhibition. Cell membrane lipid peroxidation lead to intracellular glycerol content increased, Chromatoplast produced strong stress response, the pigment synthesis was increased, especially peridinin content. More intracellular substances produced through cell metabolisms, such as starch and lipid droplets, and resulting in enlargement of vacuoles. Chromatoplast is one of the most important organelle to response stress and to resist adversity. The ecological effect of azelaic acid was mainly classified to allelopathy as for its low concentration and higher inhibition effect. Mangrove plant root exudates has a regulatory role on forest ecology. In situ field test on the mixed effects of mangrove plant root exudates should be strengthened in the future.
- mangrove,
- root exudates,
- carboxylic acid,
- azelaic acid,
- microalgae,
- ecological effect

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