by jbergeson » Fri Feb 02, 2018 10:23 am
Rob,
Technically there should have been a 1 in 6 chance of getting a rebloomer out of a cross between FIVI3 and a tetraploid rebloomer. But I had hundreds of such seedlings this past summer and it was I think less than 1% that bloomed and those that bloomed did not generally possess the obvious influence of FIVI3 that the other nonblooming seedlings did and therefore could have been the result of stray pollen grains.
David's theory was that "preferential pairing" takes place in the meiosis of FIVI3, resulting in it passing on only Rr combinations and not the occasional RR or rr. I don't fully understand it but some people will. If that is the correct theory, then all of your seedlings using FIVI3 with reblooming tetraploids should be Rrrr. Therefore it should be pretty easy to regain rebloom in the F3 generation.
Kim, I, too, would like to try 1-72-1 cuttings too if you would ever be so inclined to share. Early June is the best time for me to root cuttings. Cal Poly was a good seed setter, but I didn't end up with any survivors from it. Miniature and yellow are two valuable characteristics to mix in the gene pool.
I'm not ready for spring in terms of all the craziness it brings to my life as a nursery/greenhouse owner, but as a rose breeder I'm soooo ready to see those little cotyledons popping up en masse (knock on wood) and the little first buds starting to form on new seedlings.
Rob,
Technically there should have been a 1 in 6 chance of getting a rebloomer out of a cross between FIVI3 and a tetraploid rebloomer. But I had hundreds of such seedlings this past summer and it was I think less than 1% that bloomed and those that bloomed did not generally possess the obvious influence of FIVI3 that the other nonblooming seedlings did and therefore could have been the result of stray pollen grains.
David's theory was that "preferential pairing" takes place in the meiosis of FIVI3, resulting in it passing on only Rr combinations and not the occasional RR or rr. I don't fully understand it but some people will. If that is the correct theory, then all of your seedlings using FIVI3 with reblooming tetraploids should be Rrrr. Therefore it should be pretty easy to regain rebloom in the F3 generation.
Kim, I, too, would like to try 1-72-1 cuttings too if you would ever be so inclined to share. Early June is the best time for me to root cuttings. Cal Poly was a good seed setter, but I didn't end up with any survivors from it. Miniature and yellow are two valuable characteristics to mix in the gene pool.
I'm not ready for spring in terms of all the craziness it brings to my life as a nursery/greenhouse owner, but as a rose breeder I'm soooo ready to see those little cotyledons popping up en masse (knock on wood) and the little first buds starting to form on new seedlings.