[Objectives]The study was to identify the casual agent of freckle disease on Cavendish banana in Hainan Province,China.[Methods]Fungal isolates were isolated from affected leaf tissues and identified by the morphologi...[Objectives]The study was to identify the casual agent of freckle disease on Cavendish banana in Hainan Province,China.[Methods]Fungal isolates were isolated from affected leaf tissues and identified by the morphological features,molecular identification and pathogenicity test.[Results]The fungus isolated from affected leaf tissues was identified as Phyllosticta capitalensis based on the morphological properties of the colony and spore,coupled with sequence analyses of the internal transcribed spacer(ITS)region and the large subunit(LSU)rDNA gene.Koch s postulates were fulfilled by successfully re-isolating the pathogen from the artificial inoculated leaves.[Conclusions]P.capitalensis is a new pathogen responsible for Cavendish banana freckle disease in Hainan.展开更多
[Objectives]This study was conducted to clarify the biological characteristics of the pathogen Phyllosticta capitalensis,the causal agent of freckle disease on Cavendish banana in Hainan Province,China.[Methods]The im...[Objectives]This study was conducted to clarify the biological characteristics of the pathogen Phyllosticta capitalensis,the causal agent of freckle disease on Cavendish banana in Hainan Province,China.[Methods]The impact of various nutritional and environmental factors,including media,carbon sources,nitrogen sources,temperature,pH and light on the growth and sporulation of P.capitalensis was assessed using two distinct methods:mycelium growth rate and blood counting chamber.[Results]The mycelial growth and sporulation of P.capitalensis on different media exhibited notable differences.The use of banana leaf extract dextrose agar(BLEAD)and carrot agar(CA)was observed to facilitate rapid mycelial growth.The potato dextrose agar(PDA)and potato sucrose agar(PSA)were conducive to the production of conidia.The utilization of distinct carbon and nitrogen sources exerted a pronounced influence on the growth of P.capitalensis.Maltose,dextrose,fructose,and casein acid hydrolysate were the preferred substrates for mycelial growth.The tested carbon and nitrogen sources did not significantly stimulate conidial production,whereas dextrose and NaNO 3 were found to favor sporulation.The optimal temperature for mycelial growth and conidial production was determined to be 28 and 32℃,respectively.No mycelial growth was observed at 5℃.Active mycelial growth was observed at pH 6-10,with pH 6-7 being particularly conducive to sporulation.Complete darkness was conducive to mycelial growth and sporulation.[Conclusions]It is recommended that BLEDA and PDA should be incubated at 28℃for 14 d in the dark for the purpose of mycelial growth and sporulation of P.capitalensis,respectively.展开更多
通过基因克隆和测序方法,对来自国内外尖孢镰刀菌古巴专化型Fusarium oxysporum f. sp.cubense(简称Foc) 1号和4号小种的6个菌株endo-PG基因同源性、与其他真菌的亲缘关系以及endo-PG基因和氨基酸序列进行分析,为香蕉枯萎病菌致病机制...通过基因克隆和测序方法,对来自国内外尖孢镰刀菌古巴专化型Fusarium oxysporum f. sp.cubense(简称Foc) 1号和4号小种的6个菌株endo-PG基因同源性、与其他真菌的亲缘关系以及endo-PG基因和氨基酸序列进行分析,为香蕉枯萎病菌致病机制的研究奠定基础。结果表明,同小种的endo-PG序列同源性高,亲缘关系近,不同小种的同源性较低,亲缘关系较远;总体来说,4号小种比1号小种同源性更高,亲缘关系更近。在全基因序列分析中,没有发现明显的基因差异可以作为区分2个小种致病性差异的依据。根据预测的CDS序列翻译成氨基酸序列比对,发现6个菌株的endo-PG基因编码的氨基酸变异并没有引起相关保守结构域的变化,推测6个菌株的致病性可能与endo-PG基因的调控相关。展开更多
采用AFLP技术，对35个香牙蕉品种（系）进行了鉴别与分类。从AFLP试剂盒所提供的64对引物组织中选取两对引物组合EcoR I ACC+Mse I CAT和EcoR IACC+Mse I CAG对35份香牙蕉材料进行了AFLP分析，共得到扩增位点107个，其中多态性位点84个...采用AFLP技术，对35个香牙蕉品种（系）进行了鉴别与分类。从AFLP试剂盒所提供的64对引物组织中选取两对引物组合EcoR I ACC+Mse I CAT和EcoR IACC+Mse I CAG对35份香牙蕉材料进行了AFLP分析，共得到扩增位点107个，其中多态性位点84个，多态性位点比例达到78.5%，对35个品种的区分率达到100％。各品种（系）多态性带数存在差别，多态性带数量多为海南红蕉（56条），多态性比例最高为0.6667，可见其杂合程度较高；多态性带最少的为大丰1－1号（33条），其多态性比例为0.3929。各品种（系）相互之间的相似系数介于0.71-1.00，表明香牙蕉品种（系）之间遗传关系相对较近，依相似系数0.88的水平，可以将供试的35个香牙蕉品种（单株）分为6个品种群，鉴别了3个引自不同国家的品种。几内亚、苹果以及阳江矮实际上为同一个香牙蕉品种，该研究结果基于AFLP分子标记，能从分子水平上反映香牙蕉地方品种之间的亲缘关系，可以作为香牙蕉品种（系）分类的依据。展开更多
基金Supported by Hainan Provincial Natural Science Foundation of China(322MS114).
文摘[Objectives]The study was to identify the casual agent of freckle disease on Cavendish banana in Hainan Province,China.[Methods]Fungal isolates were isolated from affected leaf tissues and identified by the morphological features,molecular identification and pathogenicity test.[Results]The fungus isolated from affected leaf tissues was identified as Phyllosticta capitalensis based on the morphological properties of the colony and spore,coupled with sequence analyses of the internal transcribed spacer(ITS)region and the large subunit(LSU)rDNA gene.Koch s postulates were fulfilled by successfully re-isolating the pathogen from the artificial inoculated leaves.[Conclusions]P.capitalensis is a new pathogen responsible for Cavendish banana freckle disease in Hainan.
基金Supported by Hainan Provincial Natural Science Foundation of China(322MS114).
文摘[Objectives]This study was conducted to clarify the biological characteristics of the pathogen Phyllosticta capitalensis,the causal agent of freckle disease on Cavendish banana in Hainan Province,China.[Methods]The impact of various nutritional and environmental factors,including media,carbon sources,nitrogen sources,temperature,pH and light on the growth and sporulation of P.capitalensis was assessed using two distinct methods:mycelium growth rate and blood counting chamber.[Results]The mycelial growth and sporulation of P.capitalensis on different media exhibited notable differences.The use of banana leaf extract dextrose agar(BLEAD)and carrot agar(CA)was observed to facilitate rapid mycelial growth.The potato dextrose agar(PDA)and potato sucrose agar(PSA)were conducive to the production of conidia.The utilization of distinct carbon and nitrogen sources exerted a pronounced influence on the growth of P.capitalensis.Maltose,dextrose,fructose,and casein acid hydrolysate were the preferred substrates for mycelial growth.The tested carbon and nitrogen sources did not significantly stimulate conidial production,whereas dextrose and NaNO 3 were found to favor sporulation.The optimal temperature for mycelial growth and conidial production was determined to be 28 and 32℃,respectively.No mycelial growth was observed at 5℃.Active mycelial growth was observed at pH 6-10,with pH 6-7 being particularly conducive to sporulation.Complete darkness was conducive to mycelial growth and sporulation.[Conclusions]It is recommended that BLEDA and PDA should be incubated at 28℃for 14 d in the dark for the purpose of mycelial growth and sporulation of P.capitalensis,respectively.
文摘通过基因克隆和测序方法,对来自国内外尖孢镰刀菌古巴专化型Fusarium oxysporum f. sp.cubense(简称Foc) 1号和4号小种的6个菌株endo-PG基因同源性、与其他真菌的亲缘关系以及endo-PG基因和氨基酸序列进行分析,为香蕉枯萎病菌致病机制的研究奠定基础。结果表明,同小种的endo-PG序列同源性高,亲缘关系近,不同小种的同源性较低,亲缘关系较远;总体来说,4号小种比1号小种同源性更高,亲缘关系更近。在全基因序列分析中,没有发现明显的基因差异可以作为区分2个小种致病性差异的依据。根据预测的CDS序列翻译成氨基酸序列比对,发现6个菌株的endo-PG基因编码的氨基酸变异并没有引起相关保守结构域的变化,推测6个菌株的致病性可能与endo-PG基因的调控相关。
文摘采用AFLP技术，对35个香牙蕉品种（系）进行了鉴别与分类。从AFLP试剂盒所提供的64对引物组织中选取两对引物组合EcoR I ACC+Mse I CAT和EcoR IACC+Mse I CAG对35份香牙蕉材料进行了AFLP分析，共得到扩增位点107个，其中多态性位点84个，多态性位点比例达到78.5%，对35个品种的区分率达到100％。各品种（系）多态性带数存在差别，多态性带数量多为海南红蕉（56条），多态性比例最高为0.6667，可见其杂合程度较高；多态性带最少的为大丰1－1号（33条），其多态性比例为0.3929。各品种（系）相互之间的相似系数介于0.71-1.00，表明香牙蕉品种（系）之间遗传关系相对较近，依相似系数0.88的水平，可以将供试的35个香牙蕉品种（单株）分为6个品种群，鉴别了3个引自不同国家的品种。几内亚、苹果以及阳江矮实际上为同一个香牙蕉品种，该研究结果基于AFLP分子标记，能从分子水平上反映香牙蕉地方品种之间的亲缘关系，可以作为香牙蕉品种（系）分类的依据。
