H: Thursday, August 18, 2011

'Horizon Monarch' X 'Doreen Gale' is a Tetraploid

Seven seedlings of Rhododendron 'Horizon Monarch' X 'Doreen Gale', which were raised by Marc Colombel, have been determined to be a tetraploid using flow cytometry by

Dr. João Loureiro, Dr. Silvia Castro, José Cerca, 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 the tetraploid seedling of 'Horizon Monarch' (4X) X 'Doreen Gale' (4X), a tetraploid by a tetraploid produced a tetraploid indicating that normal meiosis most likely occurred for both tetraploid parents. In other words, the tetraploid seedlings of 'Horizon Monarch' X 'Doreen Gale' having 52 chromosomes received 26 chromosomes from the tetraploid 'Horizon Monarch' and 26 chromosomes from the tetraploid 'Doreen Gale'.

Summary of Ploidy Levels

Tetraploid 'Doreen Gale',
Tetraploid 'Horizon Monarch',
Tetraploid 7 Seedlings of 'Horizon Monarch' X 'Doreen Gale'

Source Marc Colombel

John and Sally Perkins
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