Accessibility navigation


Plasmodiophora brassicae in its Environment

Dixon, G. R. (2009) Plasmodiophora brassicae in its Environment. Journal of Plant Growth Regulation, 28 (3). pp. 212-228. ISSN 0721-7595

Full text not archived in this repository.

It is advisable to refer to the publisher's version if you intend to cite from this work. See Guidance on citing.

To link to this item DOI: 10.1007/s00344-009-9098-3

Abstract/Summary

Plasmodiophora brassicae Wor. is viewed in this article from the standpoint of a highly evolved and successful organism, well fitted for the ecological niche that it occupies. Physical, chemical, and biological components of the soil environment are discussed in relation to their effects on the survival, growth, and reproduction of this microbe. It is evident that P. brassicae is well equipped by virtue of its robust resting spores for survival through many seasonal cycles. Germination is probably triggered as a result of signals initiated by root exudates. The resultant motile zoospore moves rapidly to the root hair surface and penetration and colonization follow. The short period between germination and penetration is one of greatest vulnerability for P. brassicae. In this phase survival is affected at the very least by soil texture and structure; its moisture; pH; calcium, boron, and nitrogen content; and the presence of active microbial antagonists. These factors influence the inoculum potential (sensu Garrett, 1956) and its viability and invasive capacity. There is evidence that these effects may also influence differentially the survival of some physiologic races of P. brassicae. Considering the interaction of P. brassicae with the soil environment from the perspective of its biological fitness is an unusual approach; most authors consider only the opportunities to destroy this organism. The approach adopted here is borne of several decades spent studying P. brassicae and the respect that has been engendered for it as a biological entity. This review stops at the point of penetration, although some of the implications of the environment for successful colonization are included because they form a continuum. Interactions with the molecular and biochemical cellular environment are considered in other sections in this special edition.

Item Type:Article
Refereed:Yes
Divisions:Faculty of Life Sciences > School of Biological Sciences
Interdisciplinary centres and themes > Soil Research Centre
ID Code:9592
Uncontrolled Keywords:Plasmodiophora brassicae, Clubroot, Environment, Inoculum potential, Biological, chemical and physical interactions, CONCENTRATION INFLUENCING COLONIZATION, SOLUTION-CULTURE TECHNIQUE, CLUBROOT DISEASE, CHINESE-CABBAGE, CALCIUM CYANAMIDE, RESTING SPORES, SOIL-MOISTURE, AG3 PHOSPHONATE, PARTICLE-SIZE, PLANT-GROWTH

University Staff: Request a correction | Centaur Editors: Update this record

Page navigation