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West, John A.,Klochkova, Tatyana A.,Kim, Gwang Hoon,Loiseaux-de Goë,r, Susan Blackwell Publishing Asia 2006 Phycological research Vol.54 No.1
<P>SUMMARY</P><P><I>Olpidiopsis</I> sp. (Oomycota) was cultured with its original host <I>Bostrychia moritziana</I> (Sonder ex Kützing) J. Agardh from Madagascar. Bean-shaped zoospores with two heterokont flagella attached to the host cell wall surface and in 2 days host cells began collapsing and one or more syncytia developed in each infected cell. Zoospores were cleaved and an exit tube with a small plug was formed. Complete development and zoospore discharge occurred in 3 days. Infection occurred in cells of polysiphonous branches, monosiphonous branches, rhizoids and reproductive stichidia. Dead cells of plants treated with microwave were not infected. Susceptibility was variable in other <I>Bostrychia</I> species from different countries. <I>Bostrychia moritziana</I> (Sonder ex Kützing) J. Agardh<I>,</I> and <I>Bostrychia radicans</I> (Montagne) Montagne from Madagascar were susceptible but one <I>Bostrychia tenella</I> (J. V. Lamouroux) J. Agardh isolate from Madagascar was susceptible and two were not. <I>B. radicosa</I> (Itono) J. A. West, G. C. Zuccarello et M. Hommersand isolates from Madagascar, Thailand, Australia and New Caledonia were susceptible but an isolate from Malaysia was not. <I>B. radicans</I> isolates from Mexico and Brazil were non-susceptible as were <I>Bostrychia flagellifera</I> Post, <I>Bostrychia harveyi</I> Montagne, <I>Bostrychia montagnei</I> Harvey, <I>Bostrychia simpliciuscula</I> Harvey ex J. Agardh<I>, Bostrychia tenuissima</I> R. J. King et Puttock<I>, Stictosiphonia intricata</I>(Bory de Saint-Vincent) P. C. Silva, <I>Stictosiphonia kelanensis</I> (Grunow) R. J. King et Puttock and <I>Stictosiphonia tangatensis</I> (Post) R. J. King et Puttock, <I>Lophosiphonia</I> sp., <I>Neosiphonia</I> sp. and <I>Polysiphonia</I> spp. isolates were also non-susceptible. Many non-susceptible strains showed initial cell-collapse followed by rapid wound-repair cell formation without syncytia or sporangia developing. <I>Caloglossa leprieurii</I> (Montagne) G. Martens from Madagascar showed cell-collapse and wound-repair in periaxial cells, but wing cells died and became purple without wound-repair. <I>Caloglossa ogasawaraensis</I> Okamura and <I>Caloglossa postiae</I> M. Kamiya et R. J. King had no symptoms of infection. <I>Dasysiphonia chejuensis</I> I. K. Lee et J. A. West was not infected. Surprisingly, the conchocelis phase but not the blade phase of <I>Porphyra pulchella</I> J. A.West, G. C. Zuccarello and <I>Porphyra suborbiculata</I> Kjellman was infected. The conchocelis of <I>Porphyra tenera</I> Kjellman and <I>Porphyra linearis</I> Greville were infected but no blade stages were tested. <I>Porphyra miniata</I> (C. Agardh) C. Agardh and <I>Porphyra dentata</I> Kjellman conchocelis were not infected. <I>Bangia atropurpurea</I> (Roth) C. Agardh gametophyte filaments were not infected. Other red, brown and green algae were not infected. Time lapse videomicroscopy of development and spore release was done.</P>
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