optimization of hip maturing

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Re: optimization of hip maturing

Postby Neil » Thu Apr 21, 2011 1:00 am

Don: Just spending time in warmer enviremens looking around.

The cemetery is on the hill with the statue of Christ. It was spared along with 200 people that made it there.



I believe this is more of a memorial with a rose planted for each of the 25,000 people that perished in Yangay. The avalanche started 12 kilometers back of the current church and turned into a landslide with 70,000 people in the path wiped out.

This area is between cordillera blanco and cordillera negro, both are steep.
Neil
 

Re: optimization of hip maturing

Postby chuckp » Mon Dec 11, 2017 11:31 am

I came across this thread and have a question.

Most backyard rose breeders like myself do not have a dedicated refrigerator for the 3 month cold stratification.
Ripening fruits and vegetables give off ethylene.
What effects(negative or positive) does putting rose seeds in a home refrigerator with fruits and vegetables have on germination and the viability of rose seeds?
chuckp
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Re: optimization of hip maturing

Postby Larry Davis » Tue Dec 12, 2017 9:26 pm

Back in the 1980s I did a lot of playing with ethylene. Not much for roses except to see how it influenced rooting and leaf drop. Sure enough, it it cause leaves to drop on the more blackspot sensitive CVs. Later I found an obscure publication saying that BS causes leaves to drop in an ethylene sensitive way. No doubt it will make fruits ripen and drop, but as mentioned by Bernhard, only after a certain stage when ethylene receptors are formed. I suspect that there is very little ethylene formed in the refrig. If it is a regular one opened and closed daily, it is constantly flushed out. There is not zero, because controlled atmosphere storage of fruits like apples depends on removing ethylene, and regulating both oxygen and carbon dioxide levels. Enclosing the fruit in a plastic bag allows accumulation of gases. Which ones and to what levels, depends on the kind of plastic and its thickness.

I expect that if you keep your achenes in plastic bags which are then in a plastic box like fancy greens come in, you will accumulate much more ethylene that is generated by the broccoli some place else in the refrig. There are anti-ethylene treatments used for cut flowers. Maybe someone ought to try those to see if it interferes with germination.

Several weeks ago, late Nov, I harvested a bunch of very unripe hips that had formed in later summer on an unknown yellow HT rose bush which been subjected to some frost. I took them as 6 inch cuttings that I put unto moist potting soil and covered with a plastic bag. I kept them under continuous light in a 65 degree place. Some cuttings seem to have rooted. More than half of them (6 or 8) have colored some in the interim. Some 3 or 4 did nothing. Some 5 or 6 turned black. Sunday I harvested the undisgusting ones, removed the achenes and set them to stratify. Just for curiosity I cut open a bunch of the still cuttable achenes. 1 in 5 or 6 had a viable-looking embryo inside. I will know by summer if they are OK. Last year I got very low germination of achenes from hips well reddened on these same bushes. This fall I harvested ripe-looking hips in late Sept and they are stratifying. So we will see how it turns out.
Larry Davis
 
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