Abstract
Cytokinin content increased in Xanthi tobacco leaves systemically resistant to challenge inoculation by tobacco mosaic virus (TMV). Subsequently, root formation was strongly suppressed and shoot formation was promoted in leaf cultures derived from resistant leaves. All of these events coincided with the time of development of systemic acquired resistance, i.e. 8 days after the primary inoculation of the lower leaves. In spite of a reduction in the number of visible local lesions in resistant upper leaves, infectivity of ultracentrifuged TMV did not change markedly. Following a 1 day treatment at high temperature (32°C), when necrotization is inhibited and TMV becomes systemic, this type of resistance was not manifested. It is suggested that only the necrotization is suppressed in challenge-inoculated resistant leaves, and the production of the virus is not reduced. Chloramphenicol and ethrel, which promote local lesion production, were counteracted in leaves in which systemic acquired resistance had been induced.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: 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.
