Abstract
Data on the attack of the tubers of 2,036 F1 seedlings of 32 different cross combinations of potato varieties were collected. A survey is given of the field resistance of a large number of established varieties and of their parents. From both sets of data it appears that crossing two highly resistant parents results in a high percentage of resistant offspring. When crossing a susceptible with a resistant parent one gets a majority of resistant F1 seedlings and even among the offspring of two susceptible varieties a few resistant seedlings are encountered. The genes R 1 and R 3 for hypersensivity of the leaves exert a strong influence. Preliminary data suggest that the cambial layer just below the skin in this case is a strong barrier to the penetration of the parasite as is stated also with some varieties devoid of R-genes (Bravo, Libertas and others).
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.
