RE: A pumpkin genetics question....

AMEN  !!!   Steve, when i took the class it wasn't on the test.
but if you keep reading your book i think it is in the next chapter. 


Hope to see all the Northwest growers at Carnation on Saturday 
I'll be the one without a pumpkin who is begging for some good seeds.

Gordon Tanner
Maple Valley, WA

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Don't worry about it Steve, it won't be on the test.

Chris Michalec
Covington, WA
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> -----Original Message-----
> From: SteveS012@aol.com [SMTP:SteveS012@aol.com]
> Sent: Thursday, October 01, 1998 12:05 PM
> To:   pumpkins@mallorn.com
> Subject:      A pumpkin genetics question....
> 
> O.K., I spent a few minutes reading a bit about botany of pumpkins,
> etc. 
> So what I wanted to know is, since pumpkin flowers are zygomorphic,
> (asymmetrical/bilaterally symmetrical corolla), more genes are
> involved, in
> the morphogenesis of flowers, in producing them than actinomorphic
> corollas,
> right?
> Does this mean a better chance of spontaneous mutation, or less
> controllable
> results from artificially induced mutation? If a pollen mutation was
> artificially induced in the progametrophyte without damaging the
> supratectate
> sculpturing of the exine, which would modify the cytokinin or some
> other
> factor in the endosperm formed from the triploid nucleus produced by
> the sperm
> that unites with two of the three nuclei in the pollen tube, how would
> that
> influence that gamephyte generation? Or would it be optimal to instead
> attempt
> to induce mutation in the sperm nuclei that unites with the egg at
> syngamy in
> the female gametophyte, therefore affecting the zygote that becomes
> the
> sporophye embryo? Has anyone done experiments where the balance or
> amounts of
> hormones in the endosperm was augmented in any way, (would mutation of
> the
> sperm that produces the triploid nucleus even cause any changes in the
> endosperm's hormonal makeup?), and what were the results? Also, what
> is the
> likelihood that a mutation of either of these types would result in
> flowers
> with undifferentiated perianths (tepals)? (Since the mutation might
> mess with
> the genes that form the calyx, and I think that the endosperm hormones
> in
> flowers with tepals are different from those that have dichotomous
> venation
> and an undifferentiated mesophyll).
> Well, I apologize if this question is stupid, but I really don't know
> much
> about botany, so I am hoping someone on here can help me out! Thanks!

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