Search found 1275 matches

by Karl K
Wed Jan 22, 2020 6:15 pm
Forum: Rose Hybridizers Association Forum
Topic: I'm confused: a diploid?
Replies: 10
Views: 202

Re: I'm confused: a diploid?

R. acicularis nipponensis Crépin is a diploid. In addition, other plants have been identified as R. acicularis that are not it. I recall a debate some years ago (maybe 20) about a rose reportedly bred from R. moyesii that was a tetraploid rather than a pentaploid as expected. The solution, I think,...
by Karl K
Tue Jan 21, 2020 3:24 pm
Forum: Rose Hybridizers Association Forum
Topic: Protoplast Fusion
Replies: 6
Views: 159

Re: Protoplast Fusion

The previous note is obscure, but I think it suggests one of the mechanisms that isolates some species and genera. Here is some further info. Science Frontiers, no. 25: Jan-Feb 1983 PROMISCUOUS DNA Up until now, the three genetic systems were thought to be discrete, each going down its own pathway. ...
by Karl K
Mon Jan 20, 2020 6:09 pm
Forum: Rose Hybridizers Association Forum
Topic: Finally a splotch!
Replies: 32
Views: 1679

Re: Finally a splotch!

According to Koopman et al. (2008), Rosa persica and R. foetida are the closest of cousins. It is amusing that these two red and yellow roses seem determined to turn garden roses "blue". Oh, the authors also revealed that R. roxburghii is close kin to R. hugonis , which is pretty interesting and sug...
by Karl K
Fri Jan 17, 2020 3:25 pm
Forum: Rose Hybridizers Association Forum
Topic: What is the easiest and hardest steps in rose breeding?
Replies: 29
Views: 407

Re: What is the easiest and hardest steps in rose breeding?

I have not used 'Orangeade', but it is a beauty. Stoddard: Orangeade As A Parent (1980) http://bulbnrose.x10.mx/Roses/breeding/StoddardOrangeade1980.html It also has an impressive list of offspring. https://www.helpmefind.com/rose/l.php?grpLst=1.2.3.4.5.6.7.8.9.10.11.12.13.14.15.16.17.19&l=2.4593&ta...
by Karl K
Fri Jan 17, 2020 12:11 pm
Forum: Rose Hybridizers Association Forum
Topic: What is the easiest and hardest steps in rose breeding?
Replies: 29
Views: 407

Re: What is the easiest and hardest steps in rose breeding?

I remembered a note from Sam McGredy that seems worth passing along. An abundantly fruitful specimen seems to be less picky about the pollen it accepts. rec.gardens.roses 12/16/95 A lot of tyros get disappointed when their attempts to cross-pollinate end in failure, as many roses set seed badly and ...
by Karl K
Thu Jan 16, 2020 7:55 pm
Forum: Rose Hybridizers Association Forum
Topic: What is the easiest and hardest steps in rose breeding?
Replies: 29
Views: 407

Re: What is the easiest and hardest steps in rose breeding?

Don wrote:
Thu Jan 16, 2020 1:19 pm
>> Brock (1954) succeeded in crossing pear x apple and raising the hybrids.

Brock 1954 svp?
http://bulbnrose.x10.mx/Heredity/BrockP ... e1954.html
by Karl K
Thu Jan 16, 2020 12:23 pm
Forum: Rose Hybridizers Association Forum
Topic: What is the easiest and hardest steps in rose breeding?
Replies: 29
Views: 407

Re: What is the easiest and hardest steps in rose breeding?

I note that, after claiming mastery of pollination, you say you only got about 4% takes. I would speculate that the bees had much greater success. (They always make me feel like a loser.) You may find that different cultivars have different times for receptiveness. (I had a rose whose stigmas were ...
by Karl K
Sun Jan 12, 2020 6:05 pm
Forum: Rose Hybridizers Association Forum
Topic: Protoplast Fusion
Replies: 6
Views: 159

Re: Protoplast Fusion

This abstract is not entirely clear, but it seems to suggest that hybrids and cybrids might be obtained between species where the chromosomes of one species are usually expelled. Anim Biotechnol. 2014 Apr 3;25(2):139-49. Incompatibility of nucleus and mitochondria causes xenomitochondrial cybrid unv...
by Karl K
Sun Jan 12, 2020 4:30 pm
Forum: Rose Hybridizers Association Forum
Topic: Protoplast Fusion
Replies: 6
Views: 159

Re: Protoplast Fusion

I came across this one while searching for something else. ISHS Acta Horticulturae 572: XX International Eucarpia Symposium, Section Ornamentals, Strategies for New Ornamentals - Part II (2002) FUNDAMENTALS FOR INTEGRATION OF SOMATIC HYBRIDIZATION IN ROSE BREEDING Authors:  A. Schum, K. Hofmann, R. ...
by Karl K
Fri Jan 10, 2020 7:55 pm
Forum: Rose Hybridizers Association Forum
Topic: Finally a splotch!
Replies: 32
Views: 1679

Re: Finally a splotch!

Kaempferol, quercetin and many other flavonoids may not look like much to human eyes, but are useful pigments aimed at those critters that view the world through UV colored glasses. For example, Rudbeckia hirta has golden yellow ray florets, as far as we can see. But in the UV spectrum, it's a diffe...
by Karl K
Wed Jan 08, 2020 5:00 pm
Forum: Rose Hybridizers Association Forum
Topic: Finally a splotch!
Replies: 32
Views: 1679

Re: Finally a splotch!

The connection between yellow-flowered species and "blue" offspring is not quite as puzzling as it seems at first glance. Le Grice (1968) discussed the various "blue" roses and their parentage. Rosa foetida figures prominently in some. http://bulbnrose.x10.mx/Roses/breeding/Legrice/Legrice.html The ...
by Karl K
Wed Jan 08, 2020 1:30 pm
Forum: Rose Hybridizers Association Forum
Topic: Protoplast Fusion
Replies: 6
Views: 159

Protoplast Fusion

As usual, I found this little tidbit while searching for something unrelated. Mottley, J., Yokoya, K., Matthews, D., Squirrell, J., Wentworth, J.E. (1996). Protoplast fusion and its potential role in the genetic improvement of roses. Acta Horticulturae 424: 393-397. The fusion of callus-derived prot...
by Karl K
Tue Jan 07, 2020 11:34 pm
Forum: Rose Hybridizers Association Forum
Topic: Photoperiod and Temperature
Replies: 1
Views: 69

Photoperiod and Temperature

Just recently I was going over some of the papers on my web page came across this item: Garner & Allard (1920) A large dump of Iris florentina L., with all earth intact, was transplanted October 20, 1919, to each of the two greenhouses. The plants exposed to the long daily period of illumination beg...
by Karl K
Tue Jan 07, 2020 1:02 pm
Forum: Rose Hybridizers Association Forum
Topic: Finally a splotch!
Replies: 32
Views: 1679

Re: Finally a splotch!

I did a quick search of this forum for Hulthemia painted and found that I was asking the same questions back in 2012. At least I'm consistent. Since then, however, I have learned about the rosacyanins, and the heat/light sensitive enzyme that produces a 3-monoglucoside pigment in the "chameleon" ros...
by Karl K
Sun Jan 05, 2020 11:44 pm
Forum: Rose Hybridizers Association Forum
Topic: Finally a splotch!
Replies: 32
Views: 1679

Re: Finally a splotch!

In addition to combining blotches with reverse bicolors, there one other that comes to mind.

Has anyone combined blotches with "hand painted"? Throw in a picotee border, and there's a dart board.
by Karl K
Sun Jan 05, 2020 4:22 pm
Forum: Rose Hybridizers Association Forum
Topic: Finally a splotch!
Replies: 32
Views: 1679

Re: Finally a splotch!

I found some answers to my questions ... asked and unasked .. on Jim Sproul's blog.
http://sproulroses.blogspot.com/2011/06/

There are some really exciting possibilities in there, and even more (perhaps) when combined with reverse bicolors (more red pigment on reverse).
by Karl K
Sat Jan 04, 2020 11:13 am
Forum: Rose Hybridizers Association Forum
Topic: Thesis- “Characterisation and genetic improvement in Rose(Rosa spp.) through mutagenesis”
Replies: 2
Views: 77

Re: Thesis- “Characterisation and genetic improvement in Rose(Rosa spp.) through mutagenesis”

Furthermore: In 1931, McClintock studied X-ray induced "mutations" in maize. She reported her tesults in her paper, Cytological observations of deficiencies involving known genes, translocations and an inversion in Zea mays. Missouri Agr. Exp. Sta. Res. Bull. 163, l-30 (1931). https://mospace.umsyst...
by Karl K
Thu Jan 02, 2020 2:09 pm
Forum: Rose Hybridizers Association Forum
Topic: Finally a splotch!
Replies: 32
Views: 1679

Re: Finally a splotch!

Mr. Moore did... Plus, there were quite a few other Halo X Tigris seedlings hanging around the nursery which were never introduced. So, no spectacular interactions. One can always dream. Next question How is the Hulthemia blotching inherited? It appears to be dominant, at least in some crosses. Doe...
by Karl K
Thu Jan 02, 2020 12:48 am
Forum: Rose Hybridizers Association Forum
Topic: Finally a splotch!
Replies: 32
Views: 1679

Re: Finally a splotch!

I understand that the Moore Halo and the Hulthemia Blotch are different patterns. Has anyone tried combining them to learn whether there is some interaction?
by Karl K
Wed Jan 01, 2020 12:46 pm
Forum: Rose Hybridizers Association Forum
Topic: Thesis- “Characterisation and genetic improvement in Rose(Rosa spp.) through mutagenesis”
Replies: 2
Views: 77

Re: Thesis- “Characterisation and genetic improvement in Rose(Rosa spp.) through mutagenesis”

As I recall, I first read about mutations in the Golden Book Encyclopedia when I was in 2nd grade. I was fascinated! Over the years I read what I could find, including the suggestion that the glow-in-the-dark paint on old radium-dial watches could induce mutations. It's just as well that I never fou...