'Phyllis Korn' x 'Trude Webster' is a Pentaploid

Two seedlings of Rhododendron 'Phyllis Korn' x 'Trude Webster', which is a Jim Barlup hybrid, have been determined to be a pentaploid 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 pentaploid seedlings of 'Phyllis Korn' (3X) x 'Trude Webster' (4X), a triploid by a tetraploid produced a pentaploid indicating that the triploid seed parent 'Phyllis Korn' was most likely unreduced. In other words, the pentaploid seedlings of 'Phyllis Korn' x 'Trude Webster' having 65 chromosomes most likely received 39 chromosomes from the triploid 'Phyllis Korn' and 26 chromosomes from the tetraploid 'Trude Webster'. Considering the parents are a triploid and a neotetraploid, meiosis may not be normal for either parent.

Summary of Ploidy Levels

Triploid 'Phyllis Korn'
Tetraploid 'Trude Webster',
Pentaploid 2 Seedlings of 'Phyllis Korn' x 'Trude Webster'

Source: Jim Barlap

John and Sally Perkins

'Peach Recital' is a Diploid

Rhododendron 'Peach Recital', which is a Jim Barlup hybrid documented as 'Percy Wiseman' x 'Summer Peach', has been determined to be a diploid 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.

Rhododendron 'Peach Recital' has as ancestors 'Broughtonii', 'Pink Pearl', 'Gomer Waterer', 'Phyllis Korn', and 'Summer Peach'.

Summary of Ploidy Levels

Diploid 'Diane',
Diploid 'Madame Carvalho',
Diploid 'Mrs. Lindsay Smith',
Diploid 'Peach Recital',
Diploid 'Summer Peach',
Triploid 'Broughtonii',
Triploid 'Gomer Waterer',
Triploid 'Phyllis Korn',
Triploid 'Pink Pearl'

Source: Jim Barlup

John and Sally Perkins

'Summer Wind' is a Diploid

Rhododendron 'Summer Wind', which is a Jim Barlup hybrid documented as 'Golden Gala' x 'Summer Peach', has been determined to be a diploid 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.

Rhododendron 'Summer Wind' has as ancestors 'Broughtonii', 'Pink Pearl', 'Gomer Waterer', 'Phyllis Korn', and 'Summer Peach'.

Summary of Ploidy Levels

Diploid 'Diane',
Diploid 'Madame Carvalho',
Diploid 'Mrs. Lindsay Smith',
Diploid 'Summer Peach',
Diploid 'Summer Wind',
Triploid 'Broughtonii',
Triploid 'Gomer Waterer',
Triploid 'Phyllis Korn',
Triploid 'Pink Pearl'

Source: Whitney Nursery

John and Sally Perkins

'Mindy’s Love' is a Diploid

Rhododendron 'Mindy’s Love', which is a Jim Barlup hybrid documented as 'Nancy Evans' x 'Lionel's Triumph', has been determined to be a diploid 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.

Summary of Ploidy Levels

Diploid 'Anna',
Diploid 'Hotei',
Diploid 'Lem's Cameo',
Diploid 'Mindy’s Love',
Diploid 'Nancy Evans',
Diploid 'Norman Gill',
Diploid 'The Honorable Jean Marie de Montague'

Source: Whitney Nursery

John and Sally Perkins

'Legend' is a Tetraploid

Rhododendron 'Legend', which is a Jim Barlup hybrid documented as 'Point Defiance' x 'Lem's Monarch', has 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.

Rhododendron 'Legend' has as ancestors 'Anna', 'Norman Gill', 'The Honourable Jean Marie de Montague', 'Marinus Koster', 'Point Defiance', and 'Lem's Monarch'.

In the case of the tetraploid 'Legend', a tetraploid crossed with a tetraploid produced a tetraploid indicating that normal reduced meiosis most likely occurred for both parents. In other words, 'Legend' having 52 chromosomes received 26 chromosomes from the tetraploid 'Point Defiance' and 26 chromosomes from the tetraploid 'Lem's Monarch'.

Summary of Ploidy Levels

Diploid 'Anna',
Diploid 'Norman Gill',
Diploid 'The Honourable Jean Marie de Montague',
Tetraploid 'Legend',
Tetraploid 'Lem's Monarch',
Tetraploid 'Marinus Koster',
Tetraploid 'Point Defiance'

Source: Whitney Nursery

John and Sally Perkins

'Summer Peach' is a Diploid

Rhododendron 'Summer Peach', which is a Jim Barlup hybrid documented as 'Whitney's Late Peach' X 'Phyllis Korn', has been determined to be a diploid 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.

Rhododendron 'Summer Peach' has as ancestors 'Broughtonii', 'Pink Pearl', 'Gomer Waterer', and 'Phyllis Korn' which are all triploids. 'Summer Peach' has as descendants 'Peach Recital' and 'Summer Wind' which are both diploids.

Summary of Ploidy Levels

Diploid 'Diane',
Diploid 'Madame Carvalho',
Diploid 'Mrs. Lindsay Smith',
Diploid 'Peach Recital',
Diploid 'Summer Peach',
Diploid 'Summer Wind',
Triploid 'Broughtonii',
Triploid 'Gomer Waterer',
Triploid 'Phyllis Korn',
Triploid 'Pink Pearl'

Source: Whitney Nursery

John and Sally Perkins