【目的】建立水稻白叶枯病菌(Xanthomonas oryzae pv.oryzae,Xoo)的分子定量法,测定Xoo侵染水稻植株后不同时间的种群量及其变化【。方法】选用以lipA和purH为靶基因序列的引物P4和P5,用SYBR Green I实时定量PCR(RTQ-PCR)分析在水稻接...【目的】建立水稻白叶枯病菌(Xanthomonas oryzae pv.oryzae,Xoo)的分子定量法,测定Xoo侵染水稻植株后不同时间的种群量及其变化【。方法】选用以lipA和purH为靶基因序列的引物P4和P5,用SYBR Green I实时定量PCR(RTQ-PCR)分析在水稻接种植株内的病菌种群量。【结果】与细菌平板计数法相比,RTQ-PCR法定量结果基本相近或略高(≤10倍),变化趋势基本相似,用2对引物P4和P5进行RTQ-PCR定量无显著差异。接种3d的植株内己有菌量积累,但不显症;从接种5d开始,细菌明显增加,植株显症并逐渐加重;接种9～14d菌量增加到峰值,并进入稳定平台期,植株显症严重。病菌种群量与植株显症间的关系可能与细菌群体感应机制有关。【结论】用RTQ-PCR分子定量法可以直接对水稻植株内的Xoo进行动态定量研究;提出了水稻病害分子定量"病菌靶基因拷贝数-DNA总量-种群量-植物病症"的研究模式。展开更多
Objective:To screen the effect of 28 medicinal plants on inhibition of pancreatic lipase and evaluate the phytochemical contents of extracts.Methods:The ethanolic extracts of 28 traditional Thai herbal medicines were ...Objective:To screen the effect of 28 medicinal plants on inhibition of pancreatic lipase and evaluate the phytochemical contents of extracts.Methods:The ethanolic extracts of 28 traditional Thai herbal medicines were assayed for their in vitro activities against porcine pancreatic lipase using p-nitrophenyl butyrate as a substrate.Quantitative estimation of flavonoids,phenolics,and alkaloids was done.Results:Extracts from four herbs,Memecylon edule Roxb.,Garcinia vilersiana Pierre,Cryptolepis elegans Wall.and Phyllanthus chamaepeuce Ridl.,at a concentration of100 mg/m L,strongly inhibited porcine pancreatic lipase by 90.97%,92.04%,94.64%and95.38%,respectively.There was a significant positive correlation between phenolic content and inhibition activity.Inhibition activity was significantly correlated with flavonoid and with alkaloid contents.Conclusions:From this result,it could be concluded that herbs represent a rich of antipancreatic lipase compounds,in particular,Cryptolepis elegans Wall.and Phyllanthus chamaepeuce Ridl.It is suggested that the phytochemical compounds from these plants may be applied for the prevention and treatment of obesity or hyperlipidemia.展开更多
目的建立梨杷止咳合剂的质量标准。方法采用薄层色谱(TLC)法对制剂中桑白皮、苦杏仁、枇杷叶进行定性鉴别;采用高效液相色谱法测定木犀草苷、3,5-双咖啡酰基奎宁酸的含量,色谱柱为Phenomenex R Luna C18柱(250 mm×4.6 mm,5μm),流...目的建立梨杷止咳合剂的质量标准。方法采用薄层色谱(TLC)法对制剂中桑白皮、苦杏仁、枇杷叶进行定性鉴别;采用高效液相色谱法测定木犀草苷、3,5-双咖啡酰基奎宁酸的含量,色谱柱为Phenomenex R Luna C18柱(250 mm×4.6 mm,5μm),流动相为乙腈-0.5%冰醋酸溶液(15∶85,V/V),流速为1.0 m L/min,检测波长为350 nm,柱温为30℃,进样量为10μL。结果桑白皮、苦杏仁、枇杷叶的TLC图斑点清晰,分离度好,阴性对照无干扰。木犀草苷、3,5-双咖啡酰基奎宁酸进样量分别在0.0801~1.6014μg和0.0371~0.7418μg范围内与峰面积线性关系良好;精密度、稳定性、重复性试验的RSD均小于3.5%;平均加样回收率分别为100.80%和97.73%,RSD分别为3.12%和3.83%(n=6)。结论该方法操作简便,结果准确,可用于梨杷止咳合剂的质量控制。展开更多
文摘【目的】建立水稻白叶枯病菌(Xanthomonas oryzae pv.oryzae,Xoo)的分子定量法,测定Xoo侵染水稻植株后不同时间的种群量及其变化【。方法】选用以lipA和purH为靶基因序列的引物P4和P5,用SYBR Green I实时定量PCR(RTQ-PCR)分析在水稻接种植株内的病菌种群量。【结果】与细菌平板计数法相比,RTQ-PCR法定量结果基本相近或略高(≤10倍),变化趋势基本相似,用2对引物P4和P5进行RTQ-PCR定量无显著差异。接种3d的植株内己有菌量积累,但不显症;从接种5d开始,细菌明显增加,植株显症并逐渐加重;接种9～14d菌量增加到峰值,并进入稳定平台期,植株显症严重。病菌种群量与植株显症间的关系可能与细菌群体感应机制有关。【结论】用RTQ-PCR分子定量法可以直接对水稻植株内的Xoo进行动态定量研究;提出了水稻病害分子定量"病菌靶基因拷贝数-DNA总量-种群量-植物病症"的研究模式。
基金Supported by Ubon Ratchathani Rajabhat University through Plant Genetic Conservation Project Under The Royal Initiative of Princess Maha Chakri Sirindhorn Program(Grant No.UBRU_RSPG_2556)
文摘Objective:To screen the effect of 28 medicinal plants on inhibition of pancreatic lipase and evaluate the phytochemical contents of extracts.Methods:The ethanolic extracts of 28 traditional Thai herbal medicines were assayed for their in vitro activities against porcine pancreatic lipase using p-nitrophenyl butyrate as a substrate.Quantitative estimation of flavonoids,phenolics,and alkaloids was done.Results:Extracts from four herbs,Memecylon edule Roxb.,Garcinia vilersiana Pierre,Cryptolepis elegans Wall.and Phyllanthus chamaepeuce Ridl.,at a concentration of100 mg/m L,strongly inhibited porcine pancreatic lipase by 90.97%,92.04%,94.64%and95.38%,respectively.There was a significant positive correlation between phenolic content and inhibition activity.Inhibition activity was significantly correlated with flavonoid and with alkaloid contents.Conclusions:From this result,it could be concluded that herbs represent a rich of antipancreatic lipase compounds,in particular,Cryptolepis elegans Wall.and Phyllanthus chamaepeuce Ridl.It is suggested that the phytochemical compounds from these plants may be applied for the prevention and treatment of obesity or hyperlipidemia.
文摘目的建立梨杷止咳合剂的质量标准。方法采用薄层色谱(TLC)法对制剂中桑白皮、苦杏仁、枇杷叶进行定性鉴别;采用高效液相色谱法测定木犀草苷、3,5-双咖啡酰基奎宁酸的含量,色谱柱为Phenomenex R Luna C18柱(250 mm×4.6 mm,5μm),流动相为乙腈-0.5%冰醋酸溶液(15∶85,V/V),流速为1.0 m L/min,检测波长为350 nm,柱温为30℃,进样量为10μL。结果桑白皮、苦杏仁、枇杷叶的TLC图斑点清晰,分离度好,阴性对照无干扰。木犀草苷、3,5-双咖啡酰基奎宁酸进样量分别在0.0801~1.6014μg和0.0371~0.7418μg范围内与峰面积线性关系良好;精密度、稳定性、重复性试验的RSD均小于3.5%;平均加样回收率分别为100.80%和97.73%,RSD分别为3.12%和3.83%(n=6)。结论该方法操作简便,结果准确,可用于梨杷止咳合剂的质量控制。
