Age of fertility

A meeting place for rose breeders.
mntlover
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Age of fertility

Post: # 69898Post mntlover
Sat May 18, 2019 12:09 pm

I know that some varieties need to mature in order to set viable seed, varying per variety, but what about pollen? How young does a bush produce pollen that is productive, provided it is going to? I am anxious to test some of the seedlings I have, more useful for carrying forward than for themselves, hopefully.
Duane

jbergeson
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Re: Age of fertility

Post: # 69900Post jbergeson
Sat May 18, 2019 4:12 pm

I see know reason why the very first blossoms wouldn't have viable pollen.

It's kind of fun to get a pocket microscope with which to observe pollen. Someone gave me one of the little aluminum tubes, no batteries or anything, just about the size of a short pen. It's good enough to observe pollen grains and get a sense of if they are viable.

Karl K
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Re: Age of fertility

Post: # 69901Post Karl K
Sat May 18, 2019 5:14 pm

jbergeson wrote:
Sat May 18, 2019 4:12 pm
I see know reason why the very first blossoms wouldn't have viable pollen.
There are cases. Some interspecific hybrids are sterile the first year or two (or longer) before becoming fertile.
http://bulbnrose.x10.mx/Heredity/King/D ... ility.html

And Fagerlind (1958) reported that some of his rose seedlings with doubled chromosomes (from colchicine) did not set hips for a few years after they began flowering.
http://bulbnrose.x10.mx/Roses/breeding/Fagerlind.html
Karl

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