Search found 291 matches

by Larry Davis
Sun Jun 17, 2018 8:13 pm
Forum: Rose Hybridizers Association Forum
Topic: -Rising-Star-Awardee-Christian-Bedard
Replies: 3
Views: 64

Re: -Rising-Star-Awardee-Christian-Bedard

Interesting stats on the Weeks operation. Notice only 6 seeds per pollination. High failure rate at hip formation? Or low fertility crosses? Recall that seeds =/= seedlings. With 25 % germ/emergence/transplant survival it might be 6 intros per year out of 60,000 transplantable seedlings. Some parent...
by Larry Davis
Sun Jun 17, 2018 7:50 pm
Forum: Rose Hybridizers Association Forum
Topic: temperature effect on bloom form
Replies: 10
Views: 200

Re: temperature effect on bloom form

These days its much easier to understand suppression as a dominant feature. I had thought of it as a gap in a pathway for many years but all we have to do now is to invoke RNAi. HR may suppress the anthocyanin genes coming from AC leaving only yellow at ordinary temps. Previously I had assumed it wa...
by Larry Davis
Thu Jun 14, 2018 7:57 pm
Forum: Rose Hybridizers Association Forum
Topic: temperature effect on bloom form
Replies: 10
Views: 200

Re: temperature effect on bloom form

Yes, I saw that color effect on late blooms in heat back around 1980-85. I wrote about it maybe in the old days paper Newsletter of that time, or possibly on this forum a decade or so ago.. That's why I assumed that the true parent was Austrian copper rather than Persian yellow. Now of course someon...
by Larry Davis
Tue Jun 12, 2018 8:55 am
Forum: Rose Hybridizers Association Forum
Topic: Diploid vs Tetraploid - a crossroads
Replies: 5
Views: 144

Re: Diploid vs Tetraploid - a crossroads

To Plazbo. Yes you are correct. Tetraploids beget tets. So of course New Dawn x HT = tet. But if there had been reblooming dips, it would have given a lot of dips. It is my understanding that if one has a decent stable of dips and tets, one can make crosses to generate interesting trip offspring. An...
by Larry Davis
Mon Jun 11, 2018 8:46 pm
Forum: Rose Hybridizers Association Forum
Topic: Diploid vs Tetraploid - a crossroads
Replies: 5
Views: 144

Re: Diploid vs Tetraploid - a crossroads

Sorry for the acronym if that's the proper word. I wrote a long article on it in the newsletter a few years ago. It stands for Flowering locus C in the model plant arabidopsis. In roses it has a different name I suppose, but the principle is the same. When normal it allows flowering only after a win...
by Larry Davis
Sun Jun 10, 2018 6:25 pm
Forum: Rose Hybridizers Association Forum
Topic: temperature effect on bloom form
Replies: 10
Views: 200

Re: temperature effect on bloom form

Interesting that there are so well-established examples of the temperature effect. The two last flowers of the season on Silver Moon were almost normal. They have two rows regular petals, about 5 rows of petaloids with one yellow edge, lots of stamens displayed in an orderly way. These flowers appea...
by Larry Davis
Sun Jun 10, 2018 6:15 pm
Forum: Rose Hybridizers Association Forum
Topic: Diploid vs Tetraploid - a crossroads
Replies: 5
Views: 144

Re: Diploid vs Tetraploid - a crossroads

My best guess, thinking of some other species that have been recently advanced by intensive breeding is that tetraploids have certain features that are advantageous in rapid reproduction/propagation for retail trade. Daylilies, iris, napa cabbage(which may have hybrid vigor being an allotetraploid) ...
by Larry Davis
Sun Jun 03, 2018 11:01 pm
Forum: Rose Hybridizers Association Forum
Topic: temperature effect on bloom form
Replies: 10
Views: 200

temperature effect on bloom form

This year we had a very cold spring with moderate to hard frosts interspersed with warmer spells from late Feb until late April. It was a cold winter too and Silver Moon lost a significant fraction of its long canes. With the cold weather delay it bloomed about a week later than usual. The most stri...
by Larry Davis
Sun Jun 03, 2018 10:19 pm
Forum: Rose Hybridizers Association Forum
Topic: Spring Observations
Replies: 9
Views: 268

Re: Spring Observations

I think that Dow mis-spelled the name on aminopyralid. It is millstone, not milestone, at least for the unaware recipients of composts from yards treated with it by commercial applicators, or cattle forage processed through cows and then composted. Several years ago our community gardens had rather ...
by Larry Davis
Sun Jun 03, 2018 10:09 pm
Forum: Rose Hybridizers Association Forum
Topic: Carefree Copper pollen
Replies: 8
Views: 228

Re: Carefree Copper pollen

Maybe next spring I should offer the "offspring of OrSup" I was not aware of a mildew issue as we generally don't see that except when I cultivate it by placing a known bad actor next to seedlings. I've been having really good results for bloom production using the taller version. Now asking it to b...
by Larry Davis
Sun May 27, 2018 8:23 pm
Forum: Rose Hybridizers Association Forum
Topic: Carefree Copper pollen
Replies: 8
Views: 228

Re: Carefree Copper pollen

CC was in the Newsletter some years ago, less than 10 I'd guess. It was a cross of Carefree Beauty as parent and Austrian Copper as pollen donor. Quite winter hardy in our latitude to well below 0 F (before global warming) and reasonably disease resistant compared to AC. Fairly double (25-30 petals ...
by Larry Davis
Sat May 26, 2018 8:42 pm
Forum: Rose Hybridizers Association Forum
Topic: Carefree Copper pollen
Replies: 8
Views: 228

Re: Carefree Copper pollen

I've not been able to get Applejack to produce significant # hips from various pollen sources. No germination of the few seeds. My best offspring of CC finally bloomed in profusion this spring. A back cross to Creefree Beauty germ in 2012, a few blooms last yr and yr before. Color like a brighter Ab...
by Larry Davis
Sun May 20, 2018 10:11 pm
Forum: Rose Hybridizers Association Forum
Topic: Carefree Copper pollen
Replies: 8
Views: 228

Carefree Copper pollen

With such a late spring, Carefree Copper is just winding up its flowering season. I harvested flowers the past few days and have pollen dry enough now to ship. If interested contact me at ldavis using my ksu address which is an edu. Just give a good letter mailing address
by Larry Davis
Sun May 20, 2018 10:08 pm
Forum: Rose Hybridizers Association Forum
Topic: Spring Observations
Replies: 9
Views: 268

Re: Spring Observations

Can you give us an estimate of how cold it got last winter, and the depth of snow (if any) during that cold spell. This is very useful relative information. If you would like some R woodsii from Lander WY I can send you some vigorously growing seedlings to see how they do up there in bitter winter M...
by Larry Davis
Sun May 13, 2018 7:40 pm
Forum: Rose Hybridizers Association Forum
Topic: Canina Chromosome pairing
Replies: 23
Views: 538

Re: Canina Chromosome pairing

Sorry for the long delay in replying to Warren's query re: do the chromosomes that don't participate in bivalent formation contribute to expressed characteristics of canina types. I think that Hilda Nybom's group, in particular, Werlemark, did the most detailed studies on this. There seems to be a s...
by Larry Davis
Sun May 13, 2018 6:51 pm
Forum: Rose Hybridizers Association Forum
Topic: Diploid x Higherploid or Higherploid x Diploid
Replies: 34
Views: 2099

Re: Diploid x Higherploid or Higherploid x Diploid

Karl, I did get pdfs of those papers from back in the good old days about diploid vs higherploidy. Send me a message and I will send them as an attachment that you can post up. My address is a simple ldavis (From back around 1988) and as everyone knows including web crawlers if they have some AI beh...
by Larry Davis
Sat Apr 21, 2018 11:17 pm
Forum: Rose Hybridizers Association Forum
Topic: Diploid x Higherploid or Higherploid x Diploid
Replies: 34
Views: 2099

Re: Diploid x Higherploid or Higherploid x Diploid

The RNA as control molecule is very muddling. This afternoon I was at a poster session talking to an undergrad about his lab's work on micro-RNA and how it is controlled by RNAi. Sometimes it is direct interaction of one RNA with another. Sometimes it is done by intervening proteins so that one RNA ...
by Larry Davis
Sat Apr 21, 2018 10:47 pm
Forum: Rose Hybridizers Association Forum
Topic: new-hardy-rose-variety-was-16-years-making
Replies: 10
Views: 574

Re: new-hardy-rose-variety-was-16-years-making

Congratulations,

Great name and great color. And definitely a need for winter hardiness north of the MN/IA line.
by Larry Davis
Sat Apr 21, 2018 10:35 pm
Forum: Rose Hybridizers Association Forum
Topic: Assessment of genetic diversity in 29 Rose germplasms using SCoT marker
Replies: 5
Views: 239

Re: Assessment of genetic diversity in 29 Rose germplasms using SCoT marker

I would be very cautious about this one. There is a built-in control with radnectar and apricot nectar CV purchased from the same nursery being compared. They come out at very different places in the dendrogram. Seems the authors did not realize the synonymy. So either the CV sold were poorly labele...
by Larry Davis
Fri Apr 13, 2018 10:58 pm
Forum: Rose Hybridizers Association Forum
Topic: Diploid x Higherploid or Higherploid x Diploid
Replies: 34
Views: 2099

Re: Diploid x Higherploid or Higherploid x Diploid

In the saltcedar case, the two species being crossed (spontaneously ,naturally) breed freely wherever they come into contact. So although the parent species can be distinguished from one another, many of the fragments that could be SNPs turn out to be identical between species. In the end only a few...