Molecular Plant Pathology

Cover image for Vol. 17 Issue 8

Edited By: Marty Dickman

Impact Factor: 4.335

ISI Journal Citation Reports © Ranking: 2015: 16/209 (Plant Sciences)

Online ISSN: 1364-3703

Associated Title(s): Plant Pathology

Pathogen Profiles - Phytomyxa

Pathogen Profile Phytomyxa

This virtual issue of Molecular Plant Pathology contains a Pathogen Profile on Plasmodiophora brassicae, which is a member of the Phytomyxea group

Pathogen Profile Phytomyxa

The review contains a brief summary, including taxonomy, life cycle and host range. Disease symptoms, strategies for disease management and useful websites are also listed here. The review then goes on to discuss this particular pathogen in detail, presenting the latest research and strategies for future work.

Members of Phytomyxea (also known as plasmodiophorids) are a class of protists that can live as parasites within plants. The Phytomyxea were originally classified as fungi, but morphological studies of their spores together with ribosomal sequence analysis has shown that they are neither fungi, nor oomycetes, but belong within the protist supergroup Rhizaria

Phytomyxea have resting spores that can survive in the soil for many years. These germinate to produce motile zoospores that attach to the host plant and inject their cytoplasm into the host cell. Here, a distinctive nuclear division process (visible as a cruciform structure) utilizes host resources to form a multinucleate plasmodium within the host. The plasmodium cleaves into many more resting spores that are released from the host.

The phytomyxea group causes several economically important diseases such as clubroot of cabbages, canola and other cruciferous plants worldwide. They can also transmit viruses in important crop plants such as wheat, barley and sugarbeet.

We hope to be able to add more Pathogen Profiles to this section. If you are interested in writing a Pathogen Profile on an appropriate member of the Phytomyxea group, please contact the editorial office.

Plasmodiophora brassicae: a review of an emerging pathogen of the Canadian canola (Brassica napus) crop
Sheau-Fang Hwang, Stephen E. Strelkov, Jie Feng, Bruce D. Gossen and Ron J. Howard