Catalog Home Page

Pythium sulcatum and P. ultimum as causal agents of cavity spot disease of carrots in Egypt

El-Tarabily, K.A., Abouzeid, M.A. and Hardy, G.E.St.J. (2004) Pythium sulcatum and P. ultimum as causal agents of cavity spot disease of carrots in Egypt. Canadian Journal of Plant Science, 84 (2). pp. 607-614.

[img]
Preview
PDF - Published Version
Download (316kB) | Preview
    Link to Published Version: http://pubservices.nrc-cnrc.ca/rp-ps/absres.jsp?la...
    *Subscription may be required

    Abstract

    In a survey of carrot diseases of the Nile delta region of northern Egypt, Pythium sulcatum (Pratt and Mitchell) and P. ultimum (Trow) were isolated from 74 and 26%, respectively, of carrot roots showing cavity spot disease. In laboratory and glasshouse pathogenicity tests, P. sulcatum caused significantly (P < 0.05) more severe damage than P. ultimum. The greater level of pathogenicity of P. sulcatum was associated with its ability to produce a wider array of cell-wall-degrading enzymes with significantly (P < 0.05) higher enzymatic activities compared to P. ultimum. Polygalacturonase, pectin lyase, pectate lyase and cellulase were detected in cavity spot lesions induced by both P. sulcatum and P. ultimum. Pectin methylesterase was detected in tissues invaded by P. sulcatum and not by P. ultimum. This is the first record of cavity spot disease of carrots in Egypt and indicates P. sulcatum and P. ultimum as the causal agents of this disease in the region surveyed.

    Publication Type: Journal Article
    Murdoch Affiliation: School of Biological Sciences and Biotechnology
    Publisher: Agricultural Institute of Canada
    Copyright: (c) The Authors
    URI: http://researchrepository.murdoch.edu.au/id/eprint/2488
    Item Control Page

    Downloads

    Downloads per month over past year