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Re: HYB: Snapped stalk result

  • Subject: Re: HYB: Snapped stalk result
  • From: Paul Archer <pharcher@mindspring.com>
  • Date: Sun, 21 Dec 2008 23:28:28 -0500 (GMT-05:00)

Don't forget there is surely some photosynthesis is going on in the chlorophyll in that outer layer of the stalk.  Photosynthesis is not strictly a "leaf" activity.  As long as there are some stomata on the photosynthetic layer it can occur.  Yes, there are probably fewer stomata but enough to allow exchange of gases for photosynthesis and respiration.  Also, if the pith is being used as a food source there has to be a way for the carbon dioxide being produced from the respiration/breakdown of carbohydrates and sugars to escape effectively.  Also for the carbohydrates to be transferred to the seed they first have to be broken down and re-assembled in the seed.  This requires oxygen for respiration to break them down and carbon dioxide for photosynthesis to reassemble them.  The storage carbohydrates are simply too large to simply easily move from the pith to the seed endosperm through the the phloem.

Paul Archer
Indianapolis, IN  Zone 5

-----Original Message-----
>From: christian foster <flatnflashy@yahoo.com>
>Sent: Dec 21, 2008 10:08 PM
>To: iris@hort.net
>Subject: Re: [iris] HYB: Snapped stalk result
>I have noticed that pods tend to develop to "full" size within two weeks after
>Since I collect all my seed pods on a designated day, usually
>between 4th and 10th of July, I shell pods at different stages of development,
>rarely mature enough to begin to split.  My observation is that there is more
>pith to remove on less mature pods and as might be expected less mature pods
>yield slightly smaller seeds.
>Given the above, I wonder if the seeds absorb
>the pith somehow.
>From: Mary
>Swann-Young <MryL1@msn.com>
>To: iris <iris@hort.net>
>Sent: Sunday, December
>21, 2008 4:00:16 PM
>Subject: [iris] HYB: Snapped stalk result
>Surprised here
>Did have some stalks so damaged by high winds this year that
>only 1/4 to
>1/8 of stalk thickness was intact, yet pods still
>matured normally.  Also had
>some pods with horrible holes blown
>through them that did fine.
>Am guessing
>the pod sucks the nutrients out of the stalk to
>nurture the seeds. 
>Perpetuating the species and all that.
>I've always rationalized not getting
>finished stalks cut off with
>the theory that the rhizome reabsorbs nutrients
>from the
>finished stalk.
>Sounds worthy of a small experiment next year, sugar
>vs letting it lay.  Just have to set some pods on duplicate stalks
>I don't intend to raise.  Shouldn't be hard.
>Am currently looking at a potted
>Bonus Mama with a pod on a lower
>branch.  From the branch socket on up, the
>finished stalk has
>shrivelled, but not the lower stalk and branch with the
>pod.  Have
>seen this behavior, in variations, before on some varieties.  But
>some will also have the whole stalk , with no pods, stay green for
>weeks after
>bloom is finished.
>Mary Lou, near Indianapolis, Z5 - wind chill near zero.
>C'mon April!
>sign-off this list, send email to majordomo@hort.net with the
>message text
>To sign-off this list, send email to majordomo@hort.net with the
>message text UNSUBSCRIBE IRIS

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