Help Wanted - Internet Detectives

Technique Flower Initiation
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The remainder of our website has been restored after inspection to remove some hacker graffiti. While scrubbing the paint off the siding we noticed that pretty much all of the links on our links page are dead or dying.

Dead links are inevitable as time goes bye. More importantly, they are worth less in gOOgle’s eyes than no links at all. Still, rather than remove the links page and lose the benefits, it would be better to sleuth out the missing content and give it a new home.

Viele Hände machen der Arbeit. Please help us locate the articles to restore the missing links and post the details to this thread so we see about hosting a copy.

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Hi Don,
not bad, but the german saying is correct: " Viele Hände, schnelles Ende"
I take the easiest part. Paul Bardens Page moved to: http://www.paulbardenroses.com/. Maybe I’ll find some more…

CybeRose moved to http://bulbnrose.x10.mx/

cheers
Bernhard

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My link is:

http://home.roadrunner.com/~kuska/

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A partial list–

I sent this material to our webmaster and was asked to post it to the thread. It may look fairly rough, but in each case I’ve provided the old URL without making a link of it, and then have given a link by which the site or former site may be accessed at present. Those things that are on the Wayback Machine should be given a permanent site if they’re considered worth maintaining.

Peter

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http://home.roadrunner.com/~kuska Henry’s home page
http://home.roadrunner.com/~kuska/rosepublicationsindex.htm

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I don’t believe that Malcolm is keeping a home page. He has a flickr
photostream, and a LAST-FM account, but I did not find a separate page of
articles and stuff.

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no longer an active rose hybridizer, but … here’s the gateway to his site–
http://www.paulbardenroses.com/

Rob is not maintaining a page

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http://maprc.blogspot.com/

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John Starnes’s blog is here: http://johnstarnesloveofroses.blogspot.com/

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http://sproulrosesbydesign.com/

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Roger still has a rose page, but has not updated it for 6 years. Presumably he has lost enthusiasm for keeping it. It’s all in Norsk.
http://home.no/rogersrosesider/

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no interviews–just pictures of Clemons’ roses: http://thoroughbredroses.synthasite.com/
Clemons does have a rose talk show here: http://www.blogtalkradio.com/rosechat/2013/04/20/david-clemons-throughbred-roses
Maybe this is intended to replace the interviews site.

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http://www.roseroyce.ca/


Genetics

http://bulbnrose.x10.mx/Heredity/Ford/FORD.HTM

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The interspecific breeding article from the Wayback Machine: Interspecific hybridization


Interspecific hybridization
A species = a set of actually or potentially interbreeding populations that is reproductively isolated from other species

Sometimes, closely related species can be crossed with each other, but this is more difficult than intraspecific hybridization.

  • What are the barriers to interspecific hybridization?
  • How can plant breeders overcome these barriers?

What are the barriers to interspecific hybridization?

Reproductive isolation between species can involve:

  • External barriers to intercrossing

  • spatial isolation

  • ecological isolation

  • different flowering times

  • Internal barriers to genetic interchange. These may:

  • prevent hybrid zygotes from forming (cross incompatibility)

  • cause hybrid plants to be non-viable, weak or sterile

  • cause hybrid breakdown in F2 or later generations (F1 is vigourous & fertile, but F2 plants are weak or sterile)

In cross incompatibility, the barrier may be at any stage in the fertilization process.

Hybrid weakness or sterility may be due to disharmony between genomes

  • nuclear-nuclear
  • nuclear-cytoplasmic (…abnormal chloroplasts)
  • embryo-endosperm
  • embryo-maternal tissue

often because of differences in the timing of critical processes:

  • cell division
  • meristem organization & differentiation
  • seed germination

Hybrid sterility may be due to failure of chromosome pairing during meiosis:

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  • non-homology of chromosomes

asynchrony of meiotic events

How can plant breeders overcome barriers to interspecific hybridization?

  • Sample the parental populations …some plants may be more cross compatible than others.

  • Make the cross in both directions…even if 1 direction is easier or is expected to be more successful

  • Double the chromosome number of 1 or both parents

  • Use bridging crosses …to allow transfer of genes between species that can’t be crossed

  • Use special emasculation & pollination techniques. For example:

  • hot-water emasculation

  • mix compatible & incompatible pollen

  • apply growth regulators to promote pollen tube growth

  • Apply growth regulators after pollination

  • Embryo culture on nutrient medium (eg. triticale Triticale )

  • Graft hybrid seedlings onto normal rootstocks

  • Double the chromosome number of a sterile hybrid (eg.triticale Triticale )


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  • Predicting the Color of Seedlings <http://www.ars.org/dynaweb/1001124/ei.cfm?M=233&SM=&SC=100007&W=C&P=N&S=100
    1124&U=1&SS=1> by Steve McCulloch

http://web.archive.org/web/20050207174630/http://www.ars.org/About_Roses/propagating-seedlings.htm

**and one more color-related article not by McCulloch
http://web.archive.org/web/20050207173242/http://www.ars.org/About_Roses/propagating-color-palette.htm

http://aggie-horticulture.tamu.edu/rose/

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http://bulbnrose.x10.mx/Heredity/Serra/serra.htm

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http://bulbnrose.x10.mx/Roses/Hurst/SEPTETx.HTM

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The chart of predicting the color of rose seedlings by Steve McCulloch was originally on the website of the Olympia Rose Society, but was dropped some years ago. I did find that it was picked up and can be found at http://www.love-of-roses.com/predict-rose-seedling-color.html

John Moe