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A Rose Man
most recent 20 JAN SHOW ALL
Initial post 22 DEC by Michael Garhart
"Oso Easy Lemon Zest® MHCREC 2.35 ± 0.02 4 0.59"

Tetraploid, too. I guess one cultivar can have multiple ploidy depending on where the tissue (root, leaflet, or pollen) was taken, as well as if it mutated and spread by mass industrial production. Sometimes simply unstable, as well.

Or that conventional measurement methods are reliable in almost all cases, but not all.

I wish this study had included Tropicana, Red Tropicana, Super Star Supreme, and/or Climbing Tropicana. Tropicana is a unique case of a triploid behaving as a tetraploid, that readily gives very large flowers and large plants, and small flowers with small plants to its kin.
Reply #1 of 6 posted 22 DEC by jedmar
Some of the ploidy stated in this publication differ from that of other sources. The method used is Flow cytometry to get an estimate. Only a few cultivars have been "confirmed with microscopy". This might be a reason for the deviations.
Reply #2 of 6 posted 23 DEC by Robert Neil Rippetoe
I'm going to hold off on changing ploidy as currently stated until we get further confirmation.
Reply #3 of 6 posted 23 DEC by jedmar
The article of Harmon, Byrne et al. on Cytogenetics etc. refers to two articles by David Zlesak, from where the chomosome counts came.
Reply #4 of 6 posted 24 DEC by Robert Neil Rippetoe
I've corresponded with David.

He attempted to clarify the situation but results were posted prematurely.

Until we establish clones were identical results are in doubt.
Reply #5 of 6 posted 20 JAN by A Rose Man
Given that the study that estimated it to be triploid used flow cytometry to determine the ploidy, a far less accurate method than direct counts I’d be inclined to believe it’s diploid. And considering the parentage tree it’s not really surprising. Both parents are possible triploids and they could have easily produced a diploid seedling when crossed
Reply #6 of 6 posted 20 JAN by Robert Neil Rippetoe
Breeds like a diploid too.
most recent 20 JAN HIDE POSTS
Initial post 20 JAN by A Rose Man
Does anyone have any idea as to where the ploidy information originated please.
most recent 16 JAN SHOW ALL
Initial post 19 OCT 15 by Michael Garhart
Has anyone tested the ploidy for this rose? I have wondered if it is a tetraploid mutation.
Reply #1 of 2 posted 2 JAN by A Rose Man
David Zlesak reported it as being triploid in 'Pollen diameter and guard cell length as predictors of ploidy in diverse rose cultivars, species, and breeding lines'
Reply #2 of 2 posted 16 JAN by Michael Garhart
Thanks. Interesting. Makes me wonder what exactly mutated for the new phenotype to spring up. Usually sports are less novel, like strictly a change in color for one genetic reason or another.
most recent 2 JAN HIDE POSTS
Initial post 2 JAN by A Rose Man
This cultivar is listed as diploid in the paper 'Chromosomes studies of rose cultivars: application into selection process'
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