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Re: HYB:double fertilization

  • Subject: Re: [iris-talk]HYB:double fertilization
  • From: "pinkirises" <pbrooks@whidbey.net>
  • Date: Fri, 24 May 2002 03:26:58 -0000

Cool!  Thanks, Bill.


--- In iris-talk@y..., Bill Shear <wshear@e...> wrote:
> Double fertilization refers to the process that takes place in 
every seed
> plant.  Each pollen grain contains 2 sperm nuclei.  One of them 
> the egg nucleus, which produces the embryo plant.   The other fuses 
with two
> additional nuclei in the ovule to produce the endosperm tissue, 
which stores
> food in the seed (yes, the endosperm tissue is thereby triploid!).
> If mixed pollen is applied to a stigma, it is possible for the 
seeds in the
> resulting pod to have different pollen parents.  Each ovule 
> event is separate.  That means there has to be at least one pollen 
grain for
> each seed produced; no more than single ovule can be fertilized by 
a single
> pollen grain.
> Bill Shear
> Department of Biology
> Hampden-Sydney College
> Hampden-Sydney VA 23943
> (434)223-6172
> FAX (434)223-6374
> email<wshear@e...>
> Moderating e-lists:
> Coleus at http://groups.yahoo.com/group/coleus
> Opiliones at http://groups.yahoo.com/group/opiliones
> Myriapod at http://groups.yahoo.com/group/myriapod
> MilliPEET website at
> ml
> SHAPE OF LIFE website at
> http://www.pbs.org/kcet/shapeoflife/episodes/conq_explo1.html
> "The old naturalists were so sensitive and sympathetic to nature 
that they
> could be surprised by the ordinary events of life.  It was an 
> miracle to them, and therefore gorgons and flying dragons were not
> incredible to them.  The greatests and saddest defect is not 
credulity, but
> our habitual forgetfulness that our science is ignorance."
> Henry David Thoreau, Journals, March 5, 1860.

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