Effects of Two Potential Allelochemicals on the Photosystem II of <i>Nitzschia closterium</i> and<i> Monostroma nitidum</i> |
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Authors: | Bowen Huang Enyi Xie Yu Ran Xinyi Chen Yongjian Huang Jianjun Cui |
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Institution: | Fishery College, Guangdong Ocean University, Zhanjiang, 524088, China |
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Abstract: | In aquaculture, high-density seaweed farming brings higher economic benefits but also increases outbreaks of diatom felt. The effective control of diatom felt in high-density seaweed farming has always been a research hotspot.
This study selected two potential allelochemicals 2-hydroxycinnamic acid and quinic acid to explore their effects
on a diatom Nitzschia closterium and an economic seaweed Monostroma nitidum. The results showed that
2-hydroxycinnamic acid had better inhibitory effects than quinic acid on the growth, pigment content and photosynthetic efficiency of N. closterium. Their half-maximal inhibitory concentrations at 120 h (IC50–120 h) were
0.9000 and 1.278 mM, respectively. Additionally, these allelochemicals had limited inhibitory effects on the
growth, pigment content and photosynthetic efficiency of M. nitidum before 24 h. To further explore the allelopathic effect of these chemicals, this study focused on the photosystem II energy fluxes of N. closterium. It was
found that 3 mM 2-hydroxycinnamic acid could destroy the whole photosynthetic system by devastating the PSII
reaction centre (RC) before 24 h; however, the same concentration of quinic acid could only down-regulate the
electron transport efficiency by changing the effective antenna size of an active RC and downregulating the PSII
reaction centre density. These experimental results are expected to provide a new strategy to control diatom felt
blooms on the high-density seaweed farming areas. |
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Keywords: | Allelochemicals 2-hydroxycinnamic acid quinic acid Nitzschia closterium" target="_blank">Nitzschia closterium" target="_blank">Nitzschia closterium Monostroma nitidum" target="_blank">Monostroma nitidum" target="_blank">Monostroma nitidum photosynthetic system |
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