Some scales with little bulbs of N. henriquesii. They were treated with Oryzalin for chromosome doubling and stored 12 weeks at 20 degrees C in a heat box.
Theo
Little bulbs of N. henriquesii
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Hello Theo,
Interesting. Isn’t N. henriquesii fertile? If so what is your object of doubling the chromosomes – I am assuming you want to double from 14 to 28 thus enabling you to get fertile progeny also with 28 chromosomes instead of the usual near sterile progeny with 21or 22 chromosomes obtained when a standard daffodil (28) is crossed with a diploid species?
What then is/are the ultimate target/s?
Brian
tIS LOOKS TO ME TO BE A POSSIBLE WAY FO CREATING MINIATURE WITH BETTER FERTILITY
i WOULD LIKE TO GROW SOME HIGHER PLOIDY BULBS JUST TO SEE HOW THEY DO COMPARED TO THE NATURAL ONES…
Brian,
You know it is and your assumption is correct too. The ultimate targets are in the far future. You could better explain them than I. But let me try: The hybridizer can make crosses between the different diploid species and he gets unfertile plants. He can make crosses between tetraploid standard daffodils and the same species and he gets unfertile plants.To overcome this barrier all species should be transformed to the tetraploid state. The descendants of the crosses above would be fertile. That means, you could transport each charakteristic of the standard daffodils, the red colour or the splitting of the corona, as for example to the jonquilla or triandrus group and make further crosses within these groups. Moreover you could succeed with nearly all interspecies crosses and get fertile plants:The daffodil paradize for the hybridizer and later on the exhibitor and the gardener. Till now this possibility only exists for the tetraploid standard daffodils and the tetraploid N. viridiflorus; two groups compared with 23 species groups.
This year I tried to transform the species N. cordubensis, N. henriquesii, N. tazetta and the species crosses Hawera and Sun Disc, which I can grow outdoors. For N. triandrus and N. assoanus there is the problem of growing them under glass and the reduced multiplication rate.
Theo