Search found 483 matches

by david zlesak
Wed May 18, 2022 5:41 pm
Forum: Rose Hybridizers Association Forum
Topic: Why keep parentage a secret?
Replies: 16
Views: 771

Re: Why keep parentage a secret?

I agree with Paul and Kim and others. It is sure nice to have honest pedigrees. With the black spot research we are doing studying specific genes that confer resistance to specific forms (aka races) of the fungus, it is nice to trace back that gene and see what the early source was bringing it into ...
by david zlesak
Tue May 10, 2022 7:40 pm
Forum: Rose Hybridizers Association Forum
Topic: Marmalade Dream
Replies: 7
Views: 226

Re: Marmalade Dream

Hi Charles!!! It looks beautiful!! The Friends School Plant Sale in St. Paul, MN has a huge plant sale every Mother's Day from vendors far and wide and they had your new 'Marmalade Dream' in the catalog. Unfortunately, the Jeffries shipment didn't make it. I was so excited to buy a plant and grow yo...
by david zlesak
Sat Apr 30, 2022 6:43 pm
Forum: Rose Hybridizers Association Forum
Topic: Rebloom and the history of the rose
Replies: 12
Views: 412

Re: Rebloom and the history of the rose

I love the approach you are describing Dane to better understand interrelationships between/among rose species. There are some other genes people are trying to follow too in order to do this. I am very interested if R. arkansana (an American species) with its rebloom that seems similar to the style ...
by david zlesak
Sat Apr 23, 2022 4:00 pm
Forum: Rose Hybridizers Association Forum
Topic: Eva (Kordes) is tetraploid, coming from diploid seedparent?
Replies: 15
Views: 603

Re: Eva (Kordes) is tetraploid, coming from diploid seedparent?

Thank you Stefan :0). It'll be fun in the future to hopefully confirm/reconfirm the ploidy of 'Eva'.
by david zlesak
Tue Apr 19, 2022 9:54 am
Forum: Rose Hybridizers Association Forum
Topic: Eva (Kordes) is tetraploid, coming from diploid seedparent?
Replies: 15
Views: 603

Re: Eva (Kordes) is tetraploid, coming from diploid seedparent?

Hi Stefan, I'd be glad to try to confirm 'Eva' if you or someone else would be able to get me a few cuttings to try to root to get some good root tips to work with.

Take care,
David
by david zlesak
Wed Apr 06, 2022 9:32 am
Forum: Rose Hybridizers Association Forum
Topic: Budding Non-Flowering Juvenile Roses
Replies: 3
Views: 226

Re: Budding Non-Flowering Juvenile Roses

I like it too :0). It is commonplace in apple breeding programs.
by david zlesak
Tue Apr 05, 2022 11:01 pm
Forum: Rose Hybridizers Association Forum
Topic: Eva (Kordes) is tetraploid, coming from diploid seedparent?
Replies: 15
Views: 603

Re: Eva (Kordes) is tetraploid, coming from diploid seedparent?

Dear PacificJade, Good point about not always taking what is reported to heart for ploidy as some of it like you say may be word of mouth and/or be inaccurate as a really good cell spread to count chromosomes well wasn't really done, etc. There is a key historical rose that I have counted multiple t...
by david zlesak
Mon Apr 04, 2022 3:48 pm
Forum: Rose Hybridizers Association Forum
Topic: Eva (Kordes) is tetraploid, coming from diploid seedparent?
Replies: 15
Views: 603

Re: Eva (Kordes) is tetraploid, coming from diploid seedparent?

Hi Karel, When meiosis is disrupted (can be in multiple ways) a possible result is some of the gametes containing the same chromosome number as the parent plant versus being halfed. These are called 2n gametes (as they have the 2n or sporophytic chromosome number, just like the parent). Sometimes th...
by david zlesak
Sun Feb 20, 2022 5:30 pm
Forum: Rose Hybridizers Association Forum
Topic: more on climbers
Replies: 25
Views: 1912

Re: more on climbers

Hi Johannes, Great idea! I have a plant Paul Olsen shared with me to do some chromosome counts on years ago. It was diploid, like anticipated. I just planted it at my new place and got it out of the pot again. Hopefully in its new spot it can thrive. I don't remember this clone being too free in flo...
by david zlesak
Sun Feb 20, 2022 11:06 am
Forum: Rose Hybridizers Association Forum
Topic: more on climbers
Replies: 25
Views: 1912

Re: more on climbers

It seems that although RoKSN is a very key gene in the flowering pathway, there are other genes that govern flowering to moderate expression. There are roses like 'Marie Pavie' that bloom in cycles, others that are more continuous, etc. It was interesting to see the allele combinations for some of t...
by david zlesak
Mon Feb 14, 2022 9:54 pm
Forum: Rose Hybridizers Association Forum
Topic: Interesting germination observation
Replies: 20
Views: 1559

Re: Interesting germination observation

Thank you Lee!! I really appreciate your willingness to experiment and share. I use peat and maybe could have a better result. The polyantha roses germinate like mad in it, but others are more problematic, but that may be due to the crosses. One thing that I wonder is maybe the impact of captan and ...
by david zlesak
Sun Feb 13, 2022 1:51 pm
Forum: Rose Hybridizers Association Forum
Topic: Safe sharing in view of today's pests
Replies: 15
Views: 921

Re: Safe sharing in view of today's pests

That's a great question about pollen and chili thrips... I don't know.... For the standard western flower thrips they seem to die when dried out after a bit with the dried pollen. I also freeze dried pollen until I use it just to store it better and suspect if they aren't dead yet, that likely does ...
by david zlesak
Sun Jan 30, 2022 1:59 pm
Forum: Rose Hybridizers Association Forum
Topic: Agnes as parent?
Replies: 34
Views: 3791

Re: Agnes as parent?

Over the years when I lived in St. Paul I repeatedly collected the limited op seed of Lilian Gibson and raised it. There were just a seed or 2 or 3 in the hips that formed. The garden had polyanthas around it and other repeat bloomers. The seedlings looked to be polyantha influenced typically with t...
by david zlesak
Sat Jan 22, 2022 10:29 am
Forum: Rose Hybridizers Association Forum
Topic: Agnes as parent?
Replies: 34
Views: 3791

Re: Agnes as parent?

Hi Rolf, What is your protocol to germinate and stain pollen? Your photo of 'Agnes' pollen looks wonderful. I'm excited for your 'Agnes' seedlings. 'Agnes' used to be popular in the Twin Cities years ago and it is fun to still find an older mature plant here and there around town. It is beautiful. I...
by david zlesak
Sun Jan 16, 2022 9:46 pm
Forum: Rose Hybridizers Association Forum
Topic: First R. setigera Results
Replies: 27
Views: 2261

Re: First R. setigera Results

Hi Stefan! I'm glad you enjoyed the video. I recorded it last summer and forgot about it. Great question and insights. I treated some seedlings of the female setigera from the MN Landscape Arb and that is where this tetraploid came from. It looks very R. setigera-like and is a likely a cross from on...
by david zlesak
Fri Jan 14, 2022 3:34 pm
Forum: Rose Hybridizers Association Forum
Topic: Cold water / empty bag stratification
Replies: 3
Views: 559

Re: Cold water / empty bag stratification

I haven't tried it too much, but when I have, I have been disappointed and went back to peat. When I don't use medium and use a bit of moisture in the bag, there often is some fungus that grows kind of sticking neighboring seeds to each other and then the seeds getting a bit dark/grey/brown and then...
by david zlesak
Thu Jan 13, 2022 9:51 pm
Forum: Rose Hybridizers Association Forum
Topic: First R. setigera Results
Replies: 27
Views: 2261

Re: First R. setigera Results

Thank you Philip for the links to the articles. Here is the article that is the precursor to our molecular marker article for where in the genome the gender gene is located in R. setigera. http://www.globalsciencebooks.info/Online/GSBOnline/images/2013/FOB_7(1)/FOB_7(1)60-64o.pdf The kind of dioecy ...
by david zlesak
Tue Jan 11, 2022 12:41 pm
Forum: Rose Hybridizers Association Forum
Topic: Types of repeat-flowering in roses
Replies: 47
Views: 4007

Re: Types of repeat-flowering in roses

I like your analogy Philip! I don't suspect the R. laxa is a hybrid in Above and Beyond is a hybrid masking a Copia or null allele of the key flowering gene. I suspect, like R. feds.) it just has the A181 allele and it is interesting that allele seems to have a bit of dominance over the wild type al...
by david zlesak
Mon Jan 10, 2022 10:56 am
Forum: Rose Hybridizers Association Forum
Topic: Types of repeat-flowering in roses
Replies: 47
Views: 4007

Re: Types of repeat-flowering in roses

Hi Jonathan! Good catch! :0) It is Lemon Fluff. I made a mistake in the thread. David
by david zlesak
Sun Jan 09, 2022 5:51 pm
Forum: Rose Hybridizers Association Forum
Topic: Types of repeat-flowering in roses
Replies: 47
Views: 4007

Re: Types of repeat-flowering in roses

Great questions! From my understanding from the work done primarily by the research group in Angers, France, this is what they found. There is a key gene called KSN or sometimes TFL (terminal flowering locus). This gene when functional and expressed actually inhibits flowering. Early in the growing ...