Search found 1311 matches

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: 727

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: 727

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: 727

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: 7
Views: 345

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: 7
Views: 345

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: 33
Views: 2103

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: 33
Views: 2103

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: 7
Views: 345

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: 107

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: 33
Views: 2103

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: 33
Views: 2103

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: 33
Views: 2103

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: 114

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: 33
Views: 2103

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: 33
Views: 2103

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: 114

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...
by Karl K
Mon Dec 30, 2019 3:50 pm
Forum: Rose Hybridizers Association Forum
Topic: All A'Twitter x Yatkan
Replies: 28
Views: 1665

Re: All A'Twitter x Yatkan

I don't know if it's the heat wave or the excessive amounts of pollen (ie 2 or 3 times a day for 5 days...seemed easier than looking for pollen that may or may not be found) but I have hip set on Crested Moss that I got this year. A lot of them seem to be phantom pregrancies (ie I can't imagine see...
by Karl K
Sat Dec 28, 2019 2:00 pm
Forum: Rose Hybridizers Association Forum
Topic: All A'Twitter x Yatkan
Replies: 28
Views: 1665

Re: All A'Twitter x Yatkan

In warmer climates (india, pakistan) centifolia reportedly sets hips, the cause of that Im not sure of. Its likely fuss in what pollen it accepts and heat stresses can alter how blooms develop ... I remembered a comment that seems to be appropriate here. Rowley (1960) wrote about triploid roses. Hi...
by Karl K
Fri Dec 20, 2019 12:41 pm
Forum: Rose Hybridizers Association Forum
Topic: Subjective Elements of Fragrance
Replies: 10
Views: 395

Re: Subjective Elements of Fragrance

Rose perfume is far more complex than we might think. Years ago I read that there were three components that were mostly responsible for the "attar of rose" perfume. Turns out those are really minor components when measured by "head space" (contribution to perceived fragrance) rather than by volume....
by Karl K
Thu Dec 19, 2019 6:58 pm
Forum: Rose Hybridizers Association Forum
Topic: Subjective Elements of Fragrance
Replies: 10
Views: 395

Re: Subjective Elements of Fragrance

Perhaps, but the alternative meaning ... the one left alone at the dance ... is not so reassuring.