Host specificity of Janczewskia (Ceramiales, Rhodophyta)

Publisher Website
Google Scholar
Abstract
Infectivity of Janczewskia morimotoi was tested on fifteen species representing six genera of the Rhodomelaceae. Only Laurencia okamurae and L. gardneri supported growth of J. morimotoi equivalent to that on its natural host, L. nipponica. About 20% of the J. morimotoi plants grew to reproductive maturity on L. subopposita, but in approximately 60% of the instances where penetration occurred, growth of the parasite stopped at an early unbranched stage. Direct penetrations by intact rhizoids into host cells was observed frequently in L. subopposita. In the presence of L. snyderae or Amansia glomerata, J. morimotoi showed polysiphonous growth, but did not grow on or penetrate into either. When J. morimotoi was cultured in the presence of either species for 2 mo and then removed to fresh host-free medium, growth to reproductive maturity occurred after 7–10 mo. When L. pacifica and Polysiphonia pacifica were cultured together, J. morimotoi penetrated L. pacifica and became reproductively mature in 1 ...

This publication has 2 references indexed in Scilit: