Re: Parentages
- To: pumpkins@mallorn.com
- Subject: Re: Parentages
- From: H* E* P*
- Date: Sat, 10 Apr 1999 14:13:57 -0700
- References:
pumpkins@mallorn.com wrote:
Rock wrote:
>
> Very often, a grower will use pollen from several male to mate 1 female. If
> the male flowers come from a different plant than that of the female, this
> is obviuosly a cross. If using multiple male flowers (from the same plant as
> the female) to pollinate, what happens to the genes?
** Until shown otherwise we would assume all the pollen grains have
equal chance to grow a pollen tube down the stigma and fertilize an egg.
However, this being biology, it seems likely one pollen would be a
little faster than pollen from the other males. [I have no facts].
> Are the male flowers from a same plant genetically different?
On average, they should all be equivalent. But if the males flowers we
not covered, I always worry that bees may have brought in wild pollen. I
always cover my male flowers.
> Should this type of pollination be note?
If one wants good records, yes. If one is using pollen from several
lines, that is semi-open pollination. When I am sibbing, I use pollen
from the best sibs available, I do not use pollen from the weak plants.
>
> A few not so serious names for this type of pollination come to mind...
> open-selfed, cross-sibbed, self-crossed...you get the picture?
We can get lots of ideas and think about it. I have attended a few
meetings of university breeders: blueberry, cowpeas, green beans,
tomato, but I did not think to ask any of these questions. I think they
use less pedigree data and more selection because they have about 100 to
300 times as many plants to select from.
Sweetpotato breeding is really strange. Few flowers make seeds and
they do not attempt any hand crosses. They plant several kinds of
sweetpotato in a "polynursery" and let insects do the crosses. If any
seeds are found, they are planted and the breeder looks for good
potatoes.
--
Harold Eddleman Ph.D. Microbiologist. i*@disknet.com
Location: Palmyra IN USA; 36 kilometers west of Louisville, Kentucky
http://www.disknet.com/indiana_biolab
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