ABB - AABB Crosses
Updated:
ABB - AABB Crosses
Updated: 20 April, 2007
Returning? Jump to Photos This page presents seedlings obtained by crossing an AAB-type triploid
with an AABB-type halfbred. These have the potential for producing offspring of two genetically
different types and this must be taken into account in evaluating their
seedlings. Tell me more about the
nomenclature.... If you are tempted by these types of crosses (and I certainly am!) you
should be aware that many of the progeny will be very difficult to classify
within the current criteria. Theoretically, a set of such seedlings
should segregate neatly into two groups -- but real life is a bit more
complicated. In practice, I have found that:
Many will look like and breed like halfbreds (OB, RB, or OGB).
Many will look like and breed like quarterbreds (OB-, RB-, or OGB-).
Some will look more like halfbreds but breed more like quarterbreds.
Some will look more like quarterbreds but breed more like halfbreds.
Some will be intermediate in both appearance and breeding behavior.
Although the first two groups are relatively easy
to classify, the others provide a significant challenge and the present classification
system effectively precludes introduction of those with intermediate traits. Click
on the thumbnail to see a larger version of a photo.
Strong performer, enough ruffling to appeal to those who like
that touch in their quarterbreds. Fertile enough to suggest that it's
a triploid, pink enough to suggest it's a tetraploid -- but in either case it
offers significant potential for the production of t-factor (tangerine) pink
arilbreds. 89-15-5. Striking colors, remarkably sunfast,
good substance, excellent bud count. Probably a functional halfbred and it
came very close to being introduced, but tests were inconclusive.
Hybridizing
Terminology. You won't find these terms in official classification
systems, but will see them in articles written by such well-known
hybridizers as Tom Wilkes and John Holden. "A" simply stands
for a set of aril chromosomes and "B" for a set of non-aril chromosomes. Fractions
were sometimes used to depict the number of sets of
aril chromosomes and the total number of sets. An AAB-type triploid
might thus be called a "2/3-bred", while "2/4" would
indicate a halfbred with two sets of aril chromosomes and two sets
of non-aril chromosomes, and "1/2" would stand for a diploid with one set of
aril chromosomes and one set of non-aril chromosomes. These
terms were once widely used by hybridizers, but fell out of favor after the
Aril Society adopted the Modified Chromosome-set Classification System but retained
the nomenclature from the older Quantum System. Today, "1/2"
usually means a fully fertile halfbred with two sets of aril and two sets of
non-aril chromosomes. I have used the old-style
hybridizers' terminology here, because it is not possible to accurately
determine the correct classification code for seedlings of this type without
extensive test crosses.
These date to the period in which I numbered crosses when I
lined out the seedlings and seedlings when they were selected to save for
further evaluation and possible introduction. The numbers are therefore no
indication of the number of crosses made or the number of seedlings produced by
each cross.
89-15: (Lovely Blanche x Eunice) X Sunrise in Glory. Go to Sibling Sheet
for more details.
89-15-1. Introduced as DRESS PINKS.
