HYB:pollen & seed

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• Subject: [iris]HYB:pollen & seed
• From: A*@aol.com
• Date: Mon, 1 May 2006 08:12:36 EDT
• List-archive: <http://www.hort.net/lists/iris/> (Web Archive)

This conversation took place on iris photos and I thought I'd move it to  
iris talk for those that don't get iris photos.  
 
Linda Hunt asked:

<<If you  combine the pollen from 2 parent plants onto the stigmatic lip of 
one bud, do  both affect the pollination or does only one little individual 
piece of pollen  actually cause the seed pod? >>
Betty answered:
 
One grain of pollen per seed, not per pod.  In the case you mention,  pollen 
from both parents could contribute to seed within the same pod.  You  could 
have some children from each pollen parent.  But the parents would be  unknown 
since you have no way of knowing which one was the parent of a given  seedling. 
 
 
Page 327 of The World of Iris . . . Seed formation.  Quote: "During  the 
first few hours after pollination, the pollen grains that were placed on the  
stigma send out tiny tubes which grow down through the style into the ovary and  
then into the ovules or embryonic seeds.  Within the pollen tube are two  male 
nuclei.  One unites with an egg cell in the ovule to become the  embryonic 
plant.  The other unites with an endosperm nucleus in the ovule  to form the 
endosperm of the seed.  For every viable iris seed, this double  fertilization 
must take place---one to produce the tiny plant . . . . .  For every seed 
produced in the pod, at least one  acceptable, viable pollen grain must be placed on 
the stigma.  
 
Linda Hunt asked who wrote the book.  
 
Gerry Snyder answered:  
 
TWoI was edited by Bee Warburton and Melba Hamblin. The referenced  
section was written by Carl Jorgensen.

Available from the AIS:  http://www.irises.org/storefront.htm at a 
bargain  $15.00


Gerry


________________________________________________________
If you  don't cross them, you can't  plant them! 
Betty W. in South-central  KY Zone 6 ---
Bridge In Time Iris Garden@website:
_www.thegardensite.com/irises/bridgeintime/_ 
(http://www.thegardensite.com/irises/bridgeintime/) 
_Reblooming Iris - Home Page_ (http://www.rebloomingiris.com/)  
_iris-photos archives_ (http://www.hort.net/lists/iris-photos/)  
_iris-talk archives_ (http://www.hort.net/lists/iris-talk/)  
_AIS: American Iris Society website_ (http://www.irises.org/)   

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