@Article{phyton.2022.022672,
AUTHOR = {Bowen Huang, Enyi Xie, Yu Ran, Xinyi Chen, Yongjian Huang, Jianjun Cui},
TITLE = {Effects of Two Potential Allelochemicals on the Photosystem II of <i>Nitzschia closterium</i> and<i> Monostroma nitidum</i>},
JOURNAL = {Phyton-International Journal of Experimental Botany},
VOLUME = {92},
YEAR = {2023},
NUMBER = {1},
PAGES = {251--269},
URL = {http://www.techscience.com/phyton/v92n1/49585},
ISSN = {1851-5657},
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 <i>Nitzschia closterium</i> and an economic seaweed <i>Monostroma nitidum</i>. The results showed that
2-hydroxycinnamic acid had better inhibitory effects than quinic acid on the growth, pigment content and photosynthetic efficiency of <i>N</i>. closterium. Their half-maximal inhibitory concentrations at 120 h (IC<sub>50–120 h</sub>) were
0.9000 and 1.278 mM, respectively. Additionally, these allelochemicals had limited inhibitory effects on the
growth, pigment content and photosynthetic efficiency of <i>M. nitidum</i> before 24 h. To further explore the allelopathic effect of these chemicals, this study focused on the photosystem II energy fluxes of <i>N. closterium</i>. 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.},
DOI = {10.32604/phyton.2022.022672}
}