hort.net Seasonal photo, (c) 2006 Christopher P. Lindsey, All Rights Reserved: do not copy
articles | gallery of plants | blog | tech blog | plant profiles | patents | mailing lists | top stories | links | shorturl service | tom clothier's archive0
 Navigation
Articles
Gallery of Plants
Blog
Tech Blog
Plant Profiles
Patents
Mailing Lists
    FAQ
    Netiquette
    Search ALL lists
    Search help
    Subscription info
Top Stories
Links
sHORTurl service
Tom Clothier's Archive
 Top Stories
Disease could hit Britain's trees hard

Ten of the best snowdrop cultivars

Plant protein database helps identify plant gene functions

Dendroclimatologists record history through trees

Potato beetle could be thwarted through gene manipulation

Hawaii expands coffee farm quarantine

Study explains flower petal loss

Unauthorized use of a plant doesn't invalidate it's patent

RSS story archive

RE: Pollen


Beth, 
Ventricosa pollen WILL work.  Apomixis is a seed-parent phenomenon.
External pollen will NOT fertilize ventricosa.  Ventricosa pollen WILL work
on other species.  

Remember that ventricosa is a tetraploid.  Hybrids using ventricosa pollen
are likely to be sterile, since most of the varieties out there are diploid,
not tetraploid.  Diploid x tetraploid = triploid.  Let me re-phrase that.

Remember that ventricosa has 4 sets of chromosomes.  Hybrids using
ventricosa pollen are likely to be sterile, since most of the varieties out
there have 2 sets of chromosomes, not 4 sets.  [2 sets] by [4 sets] = [3
sets].  The plant cannot divide 3 sets of chromosomes into 2 equal parts, so
triploids are generally both pollen- and seed-sterile.  

It is a matter of discussion whether apomixis in ventricosa RESULTED from
tetraploidy, or if tetraploidy RESULTED from apomixis.  

Oh, and just to make things a little more complex, most apomictic species
will make SOME (and some is a very very very low percentage) sexual seed.
In other words, if you make 100s of crosses onto ventricosa, and grow out
10,000s of seedlings, you MIGHT find an occasional seedling that resulted
from cross-fertilization, and not apomixis.  Apomixis is not a perfect
system.

Rick Grazzini

---------------------------------------------------------------------
To sign-off this list, send email to majordomo@mallorn.com with the
message text UNSUBSCRIBE HOSTA-OPEN





 © 1995-2015 Mallorn Computing, Inc.All Rights Reserved.
Our Privacy Statement
Other Mailing lists | Author Index | Date Index | Subject Index | Thread Index