A new octadecanoyl diterpenoid glycoside,(E)-8α,15-dihydroxy-15-(3S-hydroxy-octadecanoyl)-13-labdene-8-O-α-L-arabinopyranoside(1),was isolated from the aerial parts of Conyza blinii,and the structure was ident...A new octadecanoyl diterpenoid glycoside,(E)-8α,15-dihydroxy-15-(3S-hydroxy-octadecanoyl)-13-labdene-8-O-α-L-arabinopyranoside(1),was isolated from the aerial parts of Conyza blinii,and the structure was identified on the basis of a detailed spectroscopic analysis,including 2D NMR spectrometry and HRESI-MS.展开更多
Hemin can improve the stress resistance of plants through the heme oxygenase system.Additionally,substances contained in plants,such as secondary metabolites,can improve stress resistance.However,few studies have expl...Hemin can improve the stress resistance of plants through the heme oxygenase system.Additionally,substances contained in plants,such as secondary metabolites,can improve stress resistance.However,few studies have explored the effects of hemin on secondary metabolite content.Therefore,the effects of hemin on saponin synthesis and the mechanism of plant injury relief by hemin in Conyza blinii were investigated in this study.Hemin treatment promoted plant growth and increased the antioxidant enzyme activity and saponin content of C.blinii under osmotic stress and cold stress.Further study showed that hemin could provide sufficient precursors for saponin synthesis by improving the photosynthetic capacity of C.blinii and increasing the gene expression of key enzymes in the saponin synthesis pathway,thus increasing the saponin content.Moreover,the promotion effect of hemin on saponin synthesis is dependent on heme oxygenase-1 and can be reversed by the inhibitor Zn-protoporphyrin-IX(ZnPPIX).This study revealed that hemin can increase the saponin content of C.blinii and alleviate the damage caused by abiotic stress,and it also broadened the understanding of the relationship between hemin and secondary metabolites in plant abiotic stress relief.展开更多
基金Supported by the National Natural Science Foundation of China(No.30200024)the Natural Science Foundation of Tianjin City,China(No.033607711)
文摘A new octadecanoyl diterpenoid glycoside,(E)-8α,15-dihydroxy-15-(3S-hydroxy-octadecanoyl)-13-labdene-8-O-α-L-arabinopyranoside(1),was isolated from the aerial parts of Conyza blinii,and the structure was identified on the basis of a detailed spectroscopic analysis,including 2D NMR spectrometry and HRESI-MS.
基金supported by the Sichuan Science and Technology Program(No.2020YFH0136),China。
文摘Hemin can improve the stress resistance of plants through the heme oxygenase system.Additionally,substances contained in plants,such as secondary metabolites,can improve stress resistance.However,few studies have explored the effects of hemin on secondary metabolite content.Therefore,the effects of hemin on saponin synthesis and the mechanism of plant injury relief by hemin in Conyza blinii were investigated in this study.Hemin treatment promoted plant growth and increased the antioxidant enzyme activity and saponin content of C.blinii under osmotic stress and cold stress.Further study showed that hemin could provide sufficient precursors for saponin synthesis by improving the photosynthetic capacity of C.blinii and increasing the gene expression of key enzymes in the saponin synthesis pathway,thus increasing the saponin content.Moreover,the promotion effect of hemin on saponin synthesis is dependent on heme oxygenase-1 and can be reversed by the inhibitor Zn-protoporphyrin-IX(ZnPPIX).This study revealed that hemin can increase the saponin content of C.blinii and alleviate the damage caused by abiotic stress,and it also broadened the understanding of the relationship between hemin and secondary metabolites in plant abiotic stress relief.