HYB: expanding gene pool of TB

I see three ways the gene pool of TB could be expanded. Many think that it
may be difficult but it isn't, but it is not enough to pollinate a single
flower or two but you have to pollinate a large number.
1.)
crossing TB with other tetraploid wild species:
I think that has been done extensively with for example I. aphylla, but not
much with tetraploid I. reichenbachii, so here is some potential.
2.)
crossing tetraploid TB and diploid ones will mostly lead to triploid plants
but also sometimes to tetraploid plants. To achieve this you have to
pollinate a large number of flowers. The best way is to use the diploid
plant as mother. Sometimes it is not very easy to grow some diploid species
such as I. suaveolens or I. timofejewii. Here you should first cross these
with I. pallida or I. variegata like Tom Silvers did and then do some
inbreeding or backcrossing before you pollinate the plants with tetraploid
pollen.
3.)
To transfer gene from species with other chromosome counts cross tetraploid
ones like I. pumila (for example blue beard on yellow ground), Regelia or
Oncocyclus so you get:
12+12+12+8
or
12+12+12+10
or
12+12+12+11
If you pollinate enough flowers you have a chance to get fertile plants when
pollinated with tetraploid TB

-- 
Weitersagen: GMX DSL-Flatrates mit Tempo-Garantie!
Ab 4,99 Euro/Monat: http://www.gmx.net/de/go/dsl

---------------------------------------------------------------------
To sign-off this list, send email to majordomo@hort.net with the
message text UNSUBSCRIBE IRIS
Other Mailing lists | Author Index | Date Index | Subject Index | Thread Index