[Objectives] To study the microstructure and ultrastructure changes of P. ginseng root tip infected by C. destructans. [Methods]The paraffin section and superfine slice were used to observe the microstructure and ultr...[Objectives] To study the microstructure and ultrastructure changes of P. ginseng root tip infected by C. destructans. [Methods]The paraffin section and superfine slice were used to observe the microstructure and ultrastructure of root tip of P. ginseng,respectively.[Results] Microstructure and ultrastructure observation indicated that,the morphology and structure of epidermal cells of P. ginseng were regular,cells had abundant contents,and organelles were easy to observe in control. However,after infected by C. destructans,the cell walls were thicken seven days post inoculation,particles were deposited in epidemic cells and pith,cell walls were broken,and cells began to disintegrate. Furthermore,morphology of cells was abnormal and contents in cells were decreased when infected by C. destructans. The organelles were break up,and difficult to be distinguished. [Conclusions] Through the results we deduced that,the hypha of C. destructans should firstly invade the epidermal cells of P. ginseng,and then enter into the xylem of P. ginseng root through the intercellular space,which obstructed the transport of water and inorganic salt,and finally led to death of ginseng seedlings.展开更多
Purpose: To report the first human case of fungal keratitis caused by Cylindrocarpon destructans and to highlight the issues with the use of topical steroids, the duration of antifungal treatment and the potential rol...Purpose: To report the first human case of fungal keratitis caused by Cylindrocarpon destructans and to highlight the issues with the use of topical steroids, the duration of antifungal treatment and the potential role of topical ciclosporin. Methods: A patient presented following being injured in the left eye by a fuchsia plant. Data was collected by slit lamp examination and review of the case notes and microbiology reports. Results: No organisms were cultured from a corneal scrape however cultures from a corneal biopsy identified cylindrocarpon species morphologically resembling Cylindrocarpon destructans. The patient responded well to topical amphotericin and clotrimazole and oral voriconazole but, developed a corneal perforation, which required an urgent tectonic penetrating keratoplasty (PKP). Despite being on topical dexamethasone and natamycin, the patient presented two months post-operatively with a corneal epithelial defect and a large hypopyon. Subsequently, the patient developed a deep corneal infiltrate and corneal vascularisation with a persistent epithelial defect. Conclusion: This is the first reported case of keratitis caused by Cylindrocarpon destructans. The case highlights: the contentious issues in the use of topical steroids following PKP and the duration of antifungal treatment both in primary infection and following PKP. Furthermore, the case accentuates a potential role for ciclosporin as an alternative to steroids following PKP.展开更多
基金Supported by Special Research Projects of Traditional Chinese Medicine Industry(201407005)Medical and Health Science and Technology Innovation Project of Chinese Academy of Medical Sciences(2016-I2M-3-017)
文摘[Objectives] To study the microstructure and ultrastructure changes of P. ginseng root tip infected by C. destructans. [Methods]The paraffin section and superfine slice were used to observe the microstructure and ultrastructure of root tip of P. ginseng,respectively.[Results] Microstructure and ultrastructure observation indicated that,the morphology and structure of epidermal cells of P. ginseng were regular,cells had abundant contents,and organelles were easy to observe in control. However,after infected by C. destructans,the cell walls were thicken seven days post inoculation,particles were deposited in epidemic cells and pith,cell walls were broken,and cells began to disintegrate. Furthermore,morphology of cells was abnormal and contents in cells were decreased when infected by C. destructans. The organelles were break up,and difficult to be distinguished. [Conclusions] Through the results we deduced that,the hypha of C. destructans should firstly invade the epidermal cells of P. ginseng,and then enter into the xylem of P. ginseng root through the intercellular space,which obstructed the transport of water and inorganic salt,and finally led to death of ginseng seedlings.
文摘Purpose: To report the first human case of fungal keratitis caused by Cylindrocarpon destructans and to highlight the issues with the use of topical steroids, the duration of antifungal treatment and the potential role of topical ciclosporin. Methods: A patient presented following being injured in the left eye by a fuchsia plant. Data was collected by slit lamp examination and review of the case notes and microbiology reports. Results: No organisms were cultured from a corneal scrape however cultures from a corneal biopsy identified cylindrocarpon species morphologically resembling Cylindrocarpon destructans. The patient responded well to topical amphotericin and clotrimazole and oral voriconazole but, developed a corneal perforation, which required an urgent tectonic penetrating keratoplasty (PKP). Despite being on topical dexamethasone and natamycin, the patient presented two months post-operatively with a corneal epithelial defect and a large hypopyon. Subsequently, the patient developed a deep corneal infiltrate and corneal vascularisation with a persistent epithelial defect. Conclusion: This is the first reported case of keratitis caused by Cylindrocarpon destructans. The case highlights: the contentious issues in the use of topical steroids following PKP and the duration of antifungal treatment both in primary infection and following PKP. Furthermore, the case accentuates a potential role for ciclosporin as an alternative to steroids following PKP.
文摘从吉林省抚松地区采集到的人参根际土壤中分离、纯化获得97株细菌,采用平板对峙法筛选出13株对毁灭柱孢菌Cylindrocarpon destructans(Zinss.)Scholtan具有良好抑制作用的菌株。用生长速率法对抑菌效果最好的菌株SZ-22进行抑菌谱的测定,并进行盆栽试验验证其对人参锈腐病的防治效果。抑菌试验结果表明,菌株SZ-22发酵液对毁灭柱孢菌的抑制率达82.63%,具有较好的广谱抑菌作用。盆栽试验结果表明,菌株SZ-22对人参锈腐病的防治效果为63.02%,显著高于农药多菌灵的防效。经形态特征、生理生化特征鉴定及16S r DNA序列分析,确定菌株SZ-22为土壤短波单胞菌Brevundimonas terrae。
