SUMMARY: The localized cell wall lysis associated with asexual spore release from sporangia and spore cysts of saprolegniaceous water moulds appears, based on immunocytochemical and inhibitor studies, to be dependent on calmodulin (CaM). Distinct bands of CaM surround the exit pores of sporangia and cysts produced by and In differentiating sporangia and cysts, CaM becomes concentrated in the apical papillae, at the tips of which exit pores are formed. While all stages of sporulation can be inhibited to an extent by micromolar concentrations of trifluoperazine, an anti-CaM drug, spore release is the most sensitive.


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