标题:分离植物病原细菌之选择性培养基于显微镜下观察形态特征!

信息分类:站内新闻   作者:yiyi发布   时间:2012-2-6 22:13:47 将本页加入收藏

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选择性培养基:

    可在人工培养基上培养的病原微生物,利用它任对营养及生理代谢等方面的特定需求,设计出适合于要分离的标的微生物生长,而抑制大多数其他微生物的培养基,称之为选择性培养基(selective medium)。

    如利用D1D2D3D4D5的选择性培养可分别分离出Agrobacterium , Clavibacter, Erwinia, PseudomonasXanthomonas等各属。尔后更进一步发展出可分离到某专一种的选择性培养基,如分离梨火伤病菌(Erwinia amylovora)Miller-Schroth(MS)培养基,一般作物软腐病菌(E. carotovora)之crystal violet pectateCVP)培养基等(表5.1)。

5.1  分离植物病原细菌之选择性培养基

         

                   

Erwinia amylovora

蔗糖含量高之培养基

Miller-Schroth培养基(MS

Erwinia carotovora

Crystal violet pectate 培养基(CVP

Pseudomonas spp.

Medium B of King et al .KBA+ 抗生素

(具荧光性的)

Pseudomonas spp.

KBA + 抗生素和果胶

(具荧光性和果胶分解性的)

Streptomyces scabies

Tyrosine casein nitrate agar

Xanthomonas campestris

可溶性淀粉 + cycloheximide培养基

(某些病变种)

X. albilineans

Sucrose peptone agar + penicillincycloheximide

 

纯培养之细菌于显微镜下观察其形态特征、菌落后,均需经由革兰氏染色后再经由选择性培养基筛选,可获得确切的细菌属别和类群

革兰氏染色


                        

                        

Corynebacterium                                 Erwinia

                                              Xanthomonas

                                              Pseudomonas

                                              Agrobacterium

                                                        

                                          Yeast extract-dextrose-CaCO2培养基                                                                              (YDC agar)上为黄色菌落 

                               


Erwinia                                                Pseudomonas

                Xanthomonas (菌落通常为黏状)       Agrobacterium

                                                                    Erwinia

                                                            

Miller-Schroth培养基(MS)                                 King's medium B agar           

Crystal violet-pectate培养基(CVP                            (KB)上呈现荧光            

agar)上之生长                                              

                                            


Erwinia                      Xanthomonas                    Pseudomonas                 Erwinia                                                                                     Agrobacterium   

                                                                                          Pseudomonas  

                                                                           

                                                                  MSCVP培养基       

                                                                                      上之生长      

             


                                                           Erwinia                 Agrobacterium

                                                                                                   Pseudomonas

                                                                                  

                                                                         D-1洋菜之生长     

                                                           

Agrobacterium  Pseudomonas











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