Abstract

SummaryThe standard method (protocol 1) for disinfecting shoot expiants used for initiation of plant tissue cultures failed when Iris rhizomes were infected with bacterial soft rot (Erwinia carotovora subsp, carotovora), Two new disinfection protocols were therefore developed, They involved keeping stock plants without irrigation for two months prior to excision of expiants; alcohol disinfection of the expiants prior to excision from the rhizome; dipping of the expiant in alcohol immediately after excision; soaking in 1 % (v/v) sodium hypochlorite (protocol 2) or saturated calcium hypochlorite (protocol 3); and soaking in mercuric chloride, With protocols 2 and 3 up to 90% and 62% respectively of expiants taken from infected Iris rhizomes showing soft-rot symptoms remained free of detectable microorganisms in vitro.

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