Abstract
With 2 figures and 3 tables Abstract The wild species Nicotiana africana is a source of Potato virus Y (PVY) resistance. Tolerance to PVY was transferred from N. africana to Nicotiana tabacum by two backcrosses with variety ‘BP-210’. Successive generations were obtained by selfing. Cytological investigations covered counts of mitotic chromosomes, study of meiotic configurations and pollen viability. The number of mitotic chromosomes varied according to generations. In pollen mother cells, the number of univalents decreased with advancing generations. Stable 48-chromosome lines were found in the BC2F5. There was an increase of the percentage of PVY tolerant plants with each of the advancing generations. Challenged with two PVY isolates, the breeding lines showed higher levels of tolerance than conventional N. tabacum cultivars. There was a conspicuous absence of necrotic responses in the N. africana-derived materials. These stable breeding lines carrying N. africana-derived tolerance factors to different strains and isolates of PVY are the source of a very valuable germplasm to be used for breeding.
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.