Rhododendron ('Voluptuous' x 'Phipps Yellow') #3, which is a Werner Brack hybrid, has been determined to be a triploid using flow cytometry by
Dr. João Loureiro, Dr. Silvia Castro, José Cerca Oliveira, and Mariana Castro
Plant Ecology and Evolution Group,
Centre for Functional Ecology,
Department of Life Sciences,
Faculty of Science and Technology,
University of Coimbra, Portugal.
In the case of triploid ('Voluptuous' x 'Phipps Yellow') #3, a diploid crossed with a diploid produced a triploid indicating that unreduced meiosis most likely occurred for one of the diploid parents. In other words, ('Voluptuous' x 'Phipps Yellow') #3 having 39 chromosomes most likely received 13 from one diploid parent and 26 chromosomes from the other diploid parent.
Summary of Ploidy Levels
Diploid 'Phipps Yellow',
Diploid 'Voluptuous',
Triploid ('Voluptuous' x 'Phipps Yellow') #3
Source: Werner Brack
John and Sally Perkins
