Search found 1782 matches

by Don
Mon Feb 18, 2019 11:06 am
Forum: Rose Hybridizers Association Forum
Topic: Photorespiration breakthrough
Replies: 0
Views: 28

Photorespiration breakthrough

Photorespiration is the opposite of photosynthesis where carbon dioxide that has been captured from the atmosphere by plants is quickly lost back into the atmosphere instead of being made into sugar. A very few plants are much better than others in this regard, particularly grasses of which corn and...
by Don
Wed Feb 13, 2019 12:04 am
Forum: Rose Hybridizers Association Forum
Topic: Potato breeding article
Replies: 3
Views: 75

Re: Potato breeding article

Great article, thanks for bringing it up. You could basically replace 'potato' with 'rose' and 'tuber' with 'bloom' and it would describe the state of affairs we have. It makes me wonder if anyone has systematically created homozygous lines of roses for breeding purposes. Does anyone know?
by Don
Tue Feb 05, 2019 11:49 pm
Forum: Rose Hybridizers Association Forum
Topic: I think I'm killing my seeds
Replies: 18
Views: 331

Re: I think I'm killing my seeds

Who are the lucky parents?
by Don
Mon Feb 04, 2019 5:39 pm
Forum: Rose Hybridizers Association Forum
Topic: albino? or something else?
Replies: 5
Views: 121

Re: albino? or something else?

Hmmm. Are you sure you don't mean viridescence?
by Don
Mon Feb 04, 2019 1:26 am
Forum: Rose Hybridizers Association Forum
Topic: albino? or something else?
Replies: 5
Views: 121

Re: albino? or something else?

Not albinos at all but possibly expression variants for chlorophylls. The chlorosynthesis pathways are complex with plenty of opportunity for mutations affecting chlorophyll levels and ratios. They are yellow enough that there might even be some carotenoids present which share some of the same bioch...
by Don
Mon Feb 04, 2019 1:14 am
Forum: Rose Hybridizers Association Forum
Topic: R. Persica from seed - advice?
Replies: 11
Views: 169

Re: R. Persica from seed - advice?

With the exception of McGready's painted series I doubt there are any spin hybrids that are very far removed from the species but, sure, any hybrids would be potential bridges. Outfit yourself for a long haul.
by Don
Sat Feb 02, 2019 9:40 pm
Forum: Rose Hybridizers Association Forum
Topic: R. Persica from seed - advice?
Replies: 11
Views: 169

Re: R. Persica from seed - advice?

These may be useful references. https://drive.google.com/file/d/1sPeICNXupA1UT5JWYqQX8DkJw-YkI2qa/view?usp=sharing https://drive.google.com/file/d/12FScCor3fxrPeYE1VRn8nwFdKu8EPZ-j/view?usp=sharing Also, from Karl's website: http://bulbnrose.x10.mx/Roses/breeding/Persica/PERSICA.HTML I noticed in Ko...
by Don
Wed Jan 30, 2019 11:29 pm
Forum: Rose Hybridizers Association Forum
Topic: I think I'm killing my seeds
Replies: 18
Views: 331

Re: I think I'm killing my seeds

I would hydrate it and strip the rest of the testa but things don't look promising. If the radical tip is black upon hydration then toss it.
by Don
Wed Jan 23, 2019 12:31 am
Forum: Rose Hybridizers Association Forum
Topic: R. moyesii 'Highdownensis'
Replies: 34
Views: 3573

Re: R. moyesii 'Highdownensis'

Not the best resolution but readable.

https://drive.google.com/open?id=1s0r4C ... AKoOOMlDxn
by Don
Tue Jan 22, 2019 10:26 pm
Forum: Rose Hybridizers Association Forum
Topic: R. moyesii 'Highdownensis'
Replies: 34
Views: 3573

Re: R. moyesii 'Highdownensis'

Here we go, hopefully somebody can dig this up. Dr. Hurst's Classification of Rosa. Amer. Rose Ann., (1930), pp. 91-100 I would also see the others listed here in the Annual. https://books.google.com/books?id=npefAAAAMAAJ&pg=RA2-PA68&lpg=RA2-PA68&dq=%22Eileen+Whitehead+Erlanson%22+hurst&source=bl&ot...
by Don
Tue Jan 22, 2019 10:04 pm
Forum: Rose Hybridizers Association Forum
Topic: R. moyesii 'Highdownensis'
Replies: 34
Views: 3573

Re: R. moyesii 'Highdownensis'

Everything I have on Erlanson I scraped from Karl's website. Maybe Henry Kuska has things that are not in Karl's collection?

http://bulbnrose.x10.mx/Roses/breeding/Erlanson/

It's been a while since I reviewed these. I don't recall Erlanson and Hurst having a fistfight.
by Don
Sun Jan 20, 2019 2:56 pm
Forum: Rose Hybridizers Association Forum
Topic: I think I'm killing my seeds
Replies: 18
Views: 331

Re: I think I'm killing my seeds

Don't over-think it.

701250B%20DC4RF&S%2032ozC-01_275x400[1].png
701250B%20DC4RF&S%2032ozC-01_275x400[1].png (72 KiB) Viewed 286 times
by Don
Sun Jan 20, 2019 1:26 am
Forum: Rose Hybridizers Association Forum
Topic: I think I'm killing my seeds
Replies: 18
Views: 331

Re: I think I'm killing my seeds

If it was easy it would not be worth the effort. Your experience is exactly why I set about learning how to excise the embryos from my seeds and germinate them in-vitro. From my experience with this I know that most seeds have no embryos and most embryos that do exist are already infected with somet...
by Don
Sat Jan 12, 2019 7:43 pm
Forum: Rose Hybridizers Association Forum
Topic: Rose Rosette Disease SCRI Review Meeting Slide Presentations
Replies: 1
Views: 92

Rose Rosette Disease SCRI Review Meeting Slide Presentations

These are slideshows without narrations but informative.

https://roserosette.org/resources/rose- ... w-meeting/

For instance here's a close up you'll wish you hadn't seen.
Phyllocoptes fructiphilus.jpg
by Don
Sat Dec 15, 2018 12:17 am
Forum: Rose Hybridizers Association Forum
Topic: R. abyssinica, Basye's amphidiploid, and Doorenbos selection
Replies: 7
Views: 345

Re: R. abyssinica, Basye's amphidiploid, and Doorenbos selection

>> Someone could make another run at this sort of reblooming shrub by substituting DA for OR, and a single or semi-single, dark red HT for 'Soeur Thérèse'. Why not Soeur Thérèse' itself? I grew a handful of Soeur Thérèse' OP, very very densely pigmented plants in both anthocyanins and carotenoids. D...
by Don
Sat Dec 15, 2018 12:00 am
Forum: Rose Hybridizers Association Forum
Topic: Aphids are Rampant Indoors
Replies: 8
Views: 338

Re: Aphids are Rampant Indoors

Nicotine is toxic to roses so nix the tobacco juice.

As Joe says, imidcloprid is the way to go. My dog wears a Seresto collar made from 10% imidcloprid for eight months out of twelve. He never gets aphids.
by Don
Tue Dec 04, 2018 9:59 pm
Forum: Rose Hybridizers Association Forum
Topic: Source of data on hip production by cultivar.
Replies: 6
Views: 303

Re: Source of data on hip production by cultivar.

Is your question directed at improving your yield of seeds for breeding purposes or some other reason like, say, aesthetics or vitamin c production or jam making? If it is to improve your yield of seeds then I would suggest that it doesn't matter much. If you can't get seeds from a plant as a mother...
by Don
Sat Dec 01, 2018 7:12 am
Forum: Rose Hybridizers Association Forum
Topic: Electron transport chain
Replies: 3
Views: 135

Re: Electron transport chain

I checked to see if they made a similar animation for the chloroplast but, alas, they did not. At first I thought it was some type of numerical simulation of structural data but I think what they did was to cleverly splice outtakes of some 3-d models and fill in the background with drawings, like a ...
by Don
Thu Nov 29, 2018 12:57 am
Forum: Rose Hybridizers Association Forum
Topic: Electron transport chain
Replies: 3
Views: 135

Electron transport chain

Mitochondria were first described two decades before the Civil War. It took another 120 years to work out the biochemistry of oxidative phosphorylation and electron transport chain coupling which was the state of knowledge when I was in college in mumble . By 1984 molecular biology grads were skippi...
by Don
Tue Nov 20, 2018 10:46 pm
Forum: Rose Hybridizers Association Forum
Topic: Rising-Star-Honoree-David-Zlesak
Replies: 20
Views: 566

Re: Rising-Star-Honoree-David-Zlesak

Kudos David!

I see in the announcement that you are collecting diplocarpon. How many strains are there in nature, and are you planning to market saltshakers filled with spores as a selection tool?