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Author Topic: Snowdrop pollination - brainstorming needed  (Read 2472 times)

annew

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Re: Snowdrop pollination - brainstorming needed
« Reply #15 on: February 04, 2014, 05:58:30 PM »
I am lifting pots where possible, it's the ones in baskets I'm having problems with. Garry, that sounds like an excellent solution, but probable rather more than I need here - we're not as cold as you. Had some luck over the last few days with a bit of sunshine to heat the frames - I've pollinated and then partly closed the frames to retain the warmth. I've reapplied the pollen on the more important ones on subsequent days as well. Hope it works!
MINIONS! I need more minions!
Anne Wright, Dryad Nursery, Yorkshire, England

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Matt T

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Re: Snowdrop pollination - brainstorming needed
« Reply #16 on: February 04, 2014, 06:38:37 PM »
I think I read somewhere that EA Bowles would hold a bell cloche over a flame to capture warm air and then place it over a Crocus to encourage the flowers to open and allow pollination. A similar arrangement might work for you with the bottomless lemonade bottle and a suitable heat source?

In terms of fertilisation, it appears there are several factors involved - pollen adhesion, pollen germination, pollen tube growth, ovule receptivity etc. There seems to have been a lot of research on this in fruit trees (peaches, cherries etc).

Some studies have found that temperature can affect different part of the fertilisation process, i.e. increasing temperature speeds up pollen germination and pollen tube growth in peaches, but reduces stigmatic receptivity (http://www.ncbi.nlm.nih.gov/pubmed/16163612).

In cherries pollen germination was inhibited by increasing temperature but not pollen tube growth and the number of pollen tubes reaching the base of the style remained constant across a range of temperature regimes (http://www.amjbot.org/content/91/4/558.full - this paper cites some sources that look like interesting further reading).

Genetics also appear to have an effect on pollen germination and tube growth (www.researchgate.net/publication/222331537_The_effects_of_temperature_on_in_vitro_pollen_germination_and_pollen_tube_growth_of_Pistacia_spp).

Here is a paper on Erythronium grandiflorum, which found that "The number of pollen tubes reaching the base of the style increased rapidly between 24 and 72 hr after pollination and few or no pollen tubes grew to the ovary after 72 hr". It is also suggested that pollen tube growth is inhibited more in self-pollination than when outcrossing. (http://labs.eeb.utoronto.ca/thomson/publications/Referreed%20Article%20from%20Lab%20Group/Cruzan%20Pollen-tube%20attrition%201989%20Am%20J%20Bot.pdf)

These are not Galanthus I know, but they demonstrate that successful fertilisation of the ovules might not be a simple linear relationship with increasing temperature?

If I were you, I'd just go for it and assume that as the plants are now flowering, temperatures must also be sufficient to allow fertilisation of (at least some of) the ovules.

Good luck!
Matt Topsfield
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annew

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Re: Snowdrop pollination - brainstorming needed
« Reply #17 on: February 05, 2014, 05:39:59 PM »
Thanks for those, Matt. I'll just plod on and see what happens. :)
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Anne Wright, Dryad Nursery, Yorkshire, England

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hwscot

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Re: Snowdrop pollination - brainstorming needed
« Reply #18 on: February 27, 2014, 04:15:54 PM »
Being new to pollinating snowdrops, I appreciate all the practical advice. Thanks to Anne's (soundtrack deleted) video, and with the help of this thread, I have found collecting pollen much easier than I expected.

Harry
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annew

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Re: Snowdrop pollination - brainstorming needed
« Reply #19 on: February 27, 2014, 06:22:27 PM »
 ;D ;D
MINIONS! I need more minions!
Anne Wright, Dryad Nursery, Yorkshire, England

www.dryad-home.co.uk

 


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