Two new C-glucoside flavonoids, namely 8-C-b-D-(2-O-acetyl) glucofuranosyl apigenin and 3-O-acetylvitexin, were isolated from leaves of Crataegus pinnatifida Bge. var. major N. E. Br.. Their structures were elucidated...Two new C-glucoside flavonoids, namely 8-C-b-D-(2-O-acetyl) glucofuranosyl apigenin and 3-O-acetylvitexin, were isolated from leaves of Crataegus pinnatifida Bge. var. major N. E. Br.. Their structures were elucidated by the spectroscopic means and chemical evidence.展开更多
Nitrogen is essential for plant growth and development,with the ratio of ammonium(NH_(4)^(+))to nitrate(NO_(3)^(-))critically influencing physiological efficiency.This study investigated the effects of different NH_(4...Nitrogen is essential for plant growth and development,with the ratio of ammonium(NH_(4)^(+))to nitrate(NO_(3)^(-))critically influencing physiological efficiency.This study investigated the effects of different NH_(4)^(+)-N/NO_(3)^(-)-N mass ratios(0︰1,3︰7,1︰1,7︰3,1︰0)and a no-nitrogen control on Zanthoxylum planispinum var.dintanensis seedlings,using NH_(4)Cl and NaNO_(3) as nitrogen sources.Key results revealed that a 3︰7 NH_(4)^(+)︰NO_(3)^(-)ratio(T2)significantly enhanced stomatal conductance(G_(s)),amino acid content,root tip number,and the photochemical quenching parameters q_(P),q_(L),ETR,and F_(v)/F_(m).This treatment also maximized ground diameter increment,chlorophyll content,intercellular CO_(2)concentration(C_(i)),transpiration rate(T_(r)),ribulose-1,5-bisphosphate carboxylase(Rubisco)activity,nitrate reductase(NR)activity,and soluble protein content.Conversely,a 7︰3 ratio(T4)yielded the highest net photosynthetic rate(Pn)and fructose-1,6-bisphosphate aldolase(FBA)activity.Overall,the T4 treatment exhibited the second most effective promotion of Z.planispinum var.dintanensis seedling growth and development,after T2.In summary,mixed NH_(4)^(+)-N/NO_(3)^(-)-N nutrition markedly enhances seedling performance,with the 3︰7 ratio optimal for growth,photosynthesis,and nitrogen assimilation.Sole nitrogen sources,particularly pure NH_(4)^(+)-N,exert inhibitory effects.展开更多
Cultivated hawthorn(Crataegus pinnatifida var.major),the principal cultivated hawthorn species in China,is rich in phenolic compounds.These phytochemicals are considered essential bioactive ingredients in different or...Cultivated hawthorn(Crataegus pinnatifida var.major),the principal cultivated hawthorn species in China,is rich in phenolic compounds.These phytochemicals are considered essential bioactive ingredients in different organs of cultivated hawthorn,contributing to its health effects.However,there is lack of a comprehensive review that systematically summarizes the chemistry,health effects,and stability of phenolic substances.This review summarizes recent progress in the characterization,classification,and distribution of phenolic compounds in C.pinnatifida var.major,including procyanidins,flavonoids,phenolic acids,lignans,and others.Importantly,the stability of these compounds was found to be influenced by factors such as the hawthorn development process,postharvest storage,postharvest processing,and the gastrointestinal tract environment.Additionally,the health effects of phenolic compounds in cultivated hawthorn and their underlying mechanisms were discussed.This review provides valuable insights into the utilization of hawthorn resources and the development of the hawthorn industry.展开更多
文摘Two new C-glucoside flavonoids, namely 8-C-b-D-(2-O-acetyl) glucofuranosyl apigenin and 3-O-acetylvitexin, were isolated from leaves of Crataegus pinnatifida Bge. var. major N. E. Br.. Their structures were elucidated by the spectroscopic means and chemical evidence.
文摘Nitrogen is essential for plant growth and development,with the ratio of ammonium(NH_(4)^(+))to nitrate(NO_(3)^(-))critically influencing physiological efficiency.This study investigated the effects of different NH_(4)^(+)-N/NO_(3)^(-)-N mass ratios(0︰1,3︰7,1︰1,7︰3,1︰0)and a no-nitrogen control on Zanthoxylum planispinum var.dintanensis seedlings,using NH_(4)Cl and NaNO_(3) as nitrogen sources.Key results revealed that a 3︰7 NH_(4)^(+)︰NO_(3)^(-)ratio(T2)significantly enhanced stomatal conductance(G_(s)),amino acid content,root tip number,and the photochemical quenching parameters q_(P),q_(L),ETR,and F_(v)/F_(m).This treatment also maximized ground diameter increment,chlorophyll content,intercellular CO_(2)concentration(C_(i)),transpiration rate(T_(r)),ribulose-1,5-bisphosphate carboxylase(Rubisco)activity,nitrate reductase(NR)activity,and soluble protein content.Conversely,a 7︰3 ratio(T4)yielded the highest net photosynthetic rate(Pn)and fructose-1,6-bisphosphate aldolase(FBA)activity.Overall,the T4 treatment exhibited the second most effective promotion of Z.planispinum var.dintanensis seedling growth and development,after T2.In summary,mixed NH_(4)^(+)-N/NO_(3)^(-)-N nutrition markedly enhances seedling performance,with the 3︰7 ratio optimal for growth,photosynthesis,and nitrogen assimilation.Sole nitrogen sources,particularly pure NH_(4)^(+)-N,exert inhibitory effects.
基金supported by the Natural Science Foundation of Shandong Province(No.ZR2023QC228)the Key Research and Development Program of Zhejiang Province(No.2021C02001)+1 种基金the Shandong(Linyi)Institute of Modern Agriculture of Zhejiang University to Serve the Local Economic Development(Integration of Two Institutes)(No.ZDNY-2021-FWLY01004)the Fundamental Research Funds for the Central Universities(No.226-2022-00215),China.
文摘Cultivated hawthorn(Crataegus pinnatifida var.major),the principal cultivated hawthorn species in China,is rich in phenolic compounds.These phytochemicals are considered essential bioactive ingredients in different organs of cultivated hawthorn,contributing to its health effects.However,there is lack of a comprehensive review that systematically summarizes the chemistry,health effects,and stability of phenolic substances.This review summarizes recent progress in the characterization,classification,and distribution of phenolic compounds in C.pinnatifida var.major,including procyanidins,flavonoids,phenolic acids,lignans,and others.Importantly,the stability of these compounds was found to be influenced by factors such as the hawthorn development process,postharvest storage,postharvest processing,and the gastrointestinal tract environment.Additionally,the health effects of phenolic compounds in cultivated hawthorn and their underlying mechanisms were discussed.This review provides valuable insights into the utilization of hawthorn resources and the development of the hawthorn industry.
