Abstract
Onion roots of varieties ‘951’ and ‘Excel’ were infected under artificial conditions by a virulent isolate of the onion pink-root fungus, Pyrenochaeta terrestris. Roots of variety ‘951’ were penetrated initially at the tip while roots of variety ‘Excel’ were penetrated initially 2 cm or more back from the tip. Ultrastructural observations of infected roots of both varieties indicated that the fungus penetrated primarily or entirely by dissolution of host cell walls, rather than by pressure of fungal cells. In both varieties the fungus caused cell disruption one to several cells in advance of the fungus. In addition, the same isolate of the pink-root fungus was grown on paper consisting primarily of gymnosperm cells. The remnants of cell walls were dissolved by the fungus with no evidence of physical pressure by the fungus.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.