Citation: | SUN Nan, WANG Mengyu, CHEN Jiaxin, et al. Inhibition activity of 4-O-α-thevetopyranosyldiphyllin on Spirogyra communis and its effect on chloroplast ultrastructure[J]. Journal of South China Agricultural University, 2024, 45(3): 371-380. DOI: 10.7671/j.issn.1001-411X.202306007 |
The inhibition activity of 4-O-α-thevetopyranosyldiphyllin(TSC-3), extracted from Taiwania flousiana, on Spirogyra communis and its effect on S. communis chloroplast were investigated.
The IC50 of 4-O-α-thevetopyranosyldiphyllin on chlorophyll and carotenoids in S. communis were determined by the ethanol extraction-spectrophotometric method. The effects of 4-O-α-thevetopyranosyldiphyllin on the microstructure and ultrastructure of S. communis were observed using microscopy and transmission electron microscopy.
The IC50 of 4-O-α-thevetopyranosyldiphyllin on the contents of carotenoids, chlorophyll a, chlorophyll b and total pigments of S. communis after 7 d treatment were 3.41, 31.50, 47.34 and 29.30 mg·L−1, respectively. Further investigation showed that 4-O-α-thevetopyranosyldiphyllin could destroy the cells of S. communis, inducing broken cell wall, disappeared cell membrane, disintegrated chloroplast, completely disappeared thylakoids, dispersed starch granules, degraded and fragmented pyrenoids.
4-O-α-thevetopyranosyldiphyllin can reduce the contents of chlorophyll a, chlorophyll b and carotenoids in S. communis. The inhibition rate of carotenoids was higher than those of the other pigments. 4-O-α-thevetopyranosyldiphyllin mainly acts on the chloroplasts and cell walls. This study provides a basis for further study of the molecular herbicidal mechanism of the plant-derived herbicidal chemical 4-O-α-thevetopyranosyldiphyllin, and also provides a theoretical basis for the control of aquatic algae.
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