Bitki patojenleri Pectobacterium carotovorum, Pectobacterium atrosepticum ve Erwinia amylovora'da SpoT proteininin western blot yöntemi ile araştırılması Investigation of the SpoT protein in plant-pathogenes Pectobacterium carotovorum, Pectobacterium atrosepticum and Erwinia amylovora by the method of western blot