The four-year-old Michelia chapensis, M. platypetala, M. foveolata, and M. maudiae leaves were selected as experimental materials, and their ethanol extracts (light yellow liquid) were obtained by method of organic so...The four-year-old Michelia chapensis, M. platypetala, M. foveolata, and M. maudiae leaves were selected as experimental materials, and their ethanol extracts (light yellow liquid) were obtained by method of organic solvent extraction. The antioxidant components of extracts were initially identified by physical and chemical detection and UV scan. Moreover, the activities of anti-overoxidation for four samples on soybean oil were determined, and PA(phytic acid)and PG(propyl gallate)were contrasted. Besides, the regression models of first-order kinetics for soybean oil samples containing additives were fitted. Results showed that the extraction rate of M. chapensis was the highest (13.24%).The anti-overoxidation components of four samples were flavonoids. According to results of Pf (Oxidation Protection Factor) and determining values of MDA, we found that the capacity of anti-overoxidation for the extract from M. platypetala was the strongest(Pf value 1.25, MDA 0.456). The regression relationships for equations of first-order kinetics were significant. They were suitable to fit exponential function curves. The experiment provides scientific basis for the research and exploration of four Michelia species.展开更多
The objective of this study was to determine the pathogenicity of Bursapelenchus xylophilus isolates from China, Japan and Canada to 4-year black pine (Pinus thunbergii) and masson pine (Pinus massoniana) seedling. Th...The objective of this study was to determine the pathogenicity of Bursapelenchus xylophilus isolates from China, Japan and Canada to 4-year black pine (Pinus thunbergii) and masson pine (Pinus massoniana) seedling. The results showed that their pathogenicity diferentiated distinctly. The mortality of black pine ranged from 0 to 87.5%, and the RHS index ranged from 0 to 110. The pathogenicity of Chinese nematode populations was greater than that of Japan and Canada. The pathogenicity of BxCN3, BxCSC and BxCZD was stronger, with mortality 87.5% and the RHS index exceeding 90. In the 6 isolates whose dead rates were 87.5%, the population of BxCN3 from Nanjing had the shortest death time, 38 days. In all of the tested populatios, the dead process of population BxCZD from Zhejiang was shortest, 14 days in black pine. The results of detrermination in P. massoniana indicated that 4-year seedlings resisted P. xylophilus, with only two seedlings died in this experiment. In this study, incubating carrier with non-symptom was found in P. thunbergii seedlings inoculated with pine wood nematode. It is important for incubaton of nematodes of the spread of the nematode.展开更多
文摘The four-year-old Michelia chapensis, M. platypetala, M. foveolata, and M. maudiae leaves were selected as experimental materials, and their ethanol extracts (light yellow liquid) were obtained by method of organic solvent extraction. The antioxidant components of extracts were initially identified by physical and chemical detection and UV scan. Moreover, the activities of anti-overoxidation for four samples on soybean oil were determined, and PA(phytic acid)and PG(propyl gallate)were contrasted. Besides, the regression models of first-order kinetics for soybean oil samples containing additives were fitted. Results showed that the extraction rate of M. chapensis was the highest (13.24%).The anti-overoxidation components of four samples were flavonoids. According to results of Pf (Oxidation Protection Factor) and determining values of MDA, we found that the capacity of anti-overoxidation for the extract from M. platypetala was the strongest(Pf value 1.25, MDA 0.456). The regression relationships for equations of first-order kinetics were significant. They were suitable to fit exponential function curves. The experiment provides scientific basis for the research and exploration of four Michelia species.
文摘The objective of this study was to determine the pathogenicity of Bursapelenchus xylophilus isolates from China, Japan and Canada to 4-year black pine (Pinus thunbergii) and masson pine (Pinus massoniana) seedling. The results showed that their pathogenicity diferentiated distinctly. The mortality of black pine ranged from 0 to 87.5%, and the RHS index ranged from 0 to 110. The pathogenicity of Chinese nematode populations was greater than that of Japan and Canada. The pathogenicity of BxCN3, BxCSC and BxCZD was stronger, with mortality 87.5% and the RHS index exceeding 90. In the 6 isolates whose dead rates were 87.5%, the population of BxCN3 from Nanjing had the shortest death time, 38 days. In all of the tested populatios, the dead process of population BxCZD from Zhejiang was shortest, 14 days in black pine. The results of detrermination in P. massoniana indicated that 4-year seedlings resisted P. xylophilus, with only two seedlings died in this experiment. In this study, incubating carrier with non-symptom was found in P. thunbergii seedlings inoculated with pine wood nematode. It is important for incubaton of nematodes of the spread of the nematode.
