While comparing photosynthetic characteristics of Dryopteris fragrans(L.) Schott to those of several commonly associated plants in its native community, coordination between D. fragrans and its environment was observe...While comparing photosynthetic characteristics of Dryopteris fragrans(L.) Schott to those of several commonly associated plants in its native community, coordination between D. fragrans and its environment was observed. The diurnal net photosynthetic rate(Pn) varied dramatically for all the plants studied. D. fragrans, Woodsia ilvensis and Urtica angustifolia all exhibited unimodal type Pn variation, with low Pn, weak photosynthetic capacity, and dramatic maximal photosynthesis(Pmax) changes. When compared to values for its associated plants, D. fragrans values were of intermediate level, indicating difficulty in adapting to its environment. Moreover, the nitrate reductase activity of D. fragrans was higher than that of only one species, Artemisia gmelinii. With increasing leaf maturity and chlorophyll content, D. fragrans exhibited declining LCP(light compensation point) and a relatively low LSP(light saturation point). Because of its overall relatively weak photosynthetic capacity, D. fragrans exhibited narrow ecological amplitude with respect to light adaptation.展开更多
【目的】筛选金边也门铁花叶性状相关差异表达基因,为深入探索也门铁叶色形成的分子调控机制打下基础。【方法】基于cDNA扩增片段长度多态性分析技术(cDNA-AFLP),利用64对Eco R I和Mse I选择性扩增引物组合分析金边也门铁叶片绿色与黄...【目的】筛选金边也门铁花叶性状相关差异表达基因,为深入探索也门铁叶色形成的分子调控机制打下基础。【方法】基于cDNA扩增片段长度多态性分析技术(cDNA-AFLP),利用64对Eco R I和Mse I选择性扩增引物组合分析金边也门铁叶片绿色与黄色部分组织cDNA,经筛选、回收、克隆、测序和BLAST比对分析获得差异表达基因。【结果】利用64对引物组合共扩增出1726条可分辨的条带,并获得58条差异表达的转录衍生片段(TDFs),其中12条TDFs为特异性表达。12条特异性TDFs中,5条TDFs具有同源序列,另外7条TDFs无同源序列,为未知功能基因。在叶片黄化部位特异表达同源性为96%的TDFs序列M8E3B-2和M8E3B-3与大丽花花叶病毒Holland包涵体蛋白基因、紫茎泽兰明脉病毒基因、洋丁香黄化卷叶病毒基因等花椰菜花叶病毒科病毒基因具有较高的同源性。【结论】M8E3B-2和M8E3B-3两条TDFs序列或来源于一种花椰菜花叶病毒科病毒基因,且有可能参与了金边也门铁花叶叶色性状的形成过程。展开更多
Objectives Aspidin BB, a typical phloroglucinol derivative from Dryopteris fragrans, possesses significant antifungal property. This study aimed to investigate potential mechanism of antifungal activity of Aspidin BB ...Objectives Aspidin BB, a typical phloroglucinol derivative from Dryopteris fragrans, possesses significant antifungal property. This study aimed to investigate potential mechanism of antifungal activity of Aspidin BB against Trichophyton rubrum which is the most common pathogens responsible for chronic dermatophytosis. Methods The minimum inhibitory concentration (MIC) ofAspidin BB against strains was determined by broth microdilution. The effects of Aspidin BB on ergosterol biosynthesis were investigated by content determination based on UPLC method. Besides, the effects of drugs on squalene epoxidase (SE) in T. rubrum cell membrane were analyzed. Results MIC value of Aspidin BB against T. rubrum was 25.0 IJg/mL. Aspidin BB reduced ergosterol content significantly, but no notable effect on squalene epoxidase activity. Conclusion The results suggested that Aspidin BB inhibited ergosterol biosynthesis. However, it was not squalene epoxidase but other components may sever as possible targets in ergosterol biosynthesis pathway.展开更多
基金Supported by Funding(Topic 31072091/C020601)from the NSFC(Natural Science Foundation of China)(20082010)
文摘While comparing photosynthetic characteristics of Dryopteris fragrans(L.) Schott to those of several commonly associated plants in its native community, coordination between D. fragrans and its environment was observed. The diurnal net photosynthetic rate(Pn) varied dramatically for all the plants studied. D. fragrans, Woodsia ilvensis and Urtica angustifolia all exhibited unimodal type Pn variation, with low Pn, weak photosynthetic capacity, and dramatic maximal photosynthesis(Pmax) changes. When compared to values for its associated plants, D. fragrans values were of intermediate level, indicating difficulty in adapting to its environment. Moreover, the nitrate reductase activity of D. fragrans was higher than that of only one species, Artemisia gmelinii. With increasing leaf maturity and chlorophyll content, D. fragrans exhibited declining LCP(light compensation point) and a relatively low LSP(light saturation point). Because of its overall relatively weak photosynthetic capacity, D. fragrans exhibited narrow ecological amplitude with respect to light adaptation.
文摘【目的】筛选金边也门铁花叶性状相关差异表达基因,为深入探索也门铁叶色形成的分子调控机制打下基础。【方法】基于cDNA扩增片段长度多态性分析技术(cDNA-AFLP),利用64对Eco R I和Mse I选择性扩增引物组合分析金边也门铁叶片绿色与黄色部分组织cDNA,经筛选、回收、克隆、测序和BLAST比对分析获得差异表达基因。【结果】利用64对引物组合共扩增出1726条可分辨的条带,并获得58条差异表达的转录衍生片段(TDFs),其中12条TDFs为特异性表达。12条特异性TDFs中,5条TDFs具有同源序列,另外7条TDFs无同源序列,为未知功能基因。在叶片黄化部位特异表达同源性为96%的TDFs序列M8E3B-2和M8E3B-3与大丽花花叶病毒Holland包涵体蛋白基因、紫茎泽兰明脉病毒基因、洋丁香黄化卷叶病毒基因等花椰菜花叶病毒科病毒基因具有较高的同源性。【结论】M8E3B-2和M8E3B-3两条TDFs序列或来源于一种花椰菜花叶病毒科病毒基因,且有可能参与了金边也门铁花叶叶色性状的形成过程。
基金Application-oriented Research Project of Guangdong Provincial Department of Science and Technology(2015B020234009)Traditional Chinese Medicine Industry Research Project of State Administration of Traditional Chinese Medicine of People’s Republic of China(201507004)
文摘Objectives Aspidin BB, a typical phloroglucinol derivative from Dryopteris fragrans, possesses significant antifungal property. This study aimed to investigate potential mechanism of antifungal activity of Aspidin BB against Trichophyton rubrum which is the most common pathogens responsible for chronic dermatophytosis. Methods The minimum inhibitory concentration (MIC) ofAspidin BB against strains was determined by broth microdilution. The effects of Aspidin BB on ergosterol biosynthesis were investigated by content determination based on UPLC method. Besides, the effects of drugs on squalene epoxidase (SE) in T. rubrum cell membrane were analyzed. Results MIC value of Aspidin BB against T. rubrum was 25.0 IJg/mL. Aspidin BB reduced ergosterol content significantly, but no notable effect on squalene epoxidase activity. Conclusion The results suggested that Aspidin BB inhibited ergosterol biosynthesis. However, it was not squalene epoxidase but other components may sever as possible targets in ergosterol biosynthesis pathway.