01-12-2012, 07:43 PM
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#17 (permalink)
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Been nuts, gone bananas
Location: Isleton, Calif
Zone: 9b
Name: Harvey
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Re: Anyone else growing Meyer Lemons or Kumquats?
Quote:
Richard, I've read otherwise quite a few times and know folks that have grown citrus from seeds and obtained the desired results. I have not personally spoken to any geneticists but there is quite a bit of scholarly work online. This isn't very detained but still sufficient, I think:
Hort 403 - Lecture 32
Nucellar Embryony
Apomixis - development of an embryo without the fusion of male and female gametes.
Polyembryony - occurrence of more than one embryo in a seed.
Nucellar embryony - embryos form from nucellar tissue.
Nucellar embryony in citrus means that most embryos are vegetative not zygotic.
They are produced from nucellar tissue and are therefore clones of the mother tree.
Pollination is needed to trigger nucellar development.
Nucellar embryos begin development as soon as pollination occurs while zygotic embryos take four weeks to develop; thus, nucellar embryos crowd out the zygotic embryos.
There are various degrees of nucellar embryony.
Some cultivars produce only nucellar embryos, and some vary in the percentage of nucellar embryos.
Three citrus types produce monoembryonic and therefore zygotic seed
'Temple tangelo'
'Clementine' tangerine
Shaddock, Citrus grandis (pomelo)
There are some important implications of nucellar embryony.
Rootstocks such as 'Rough Lemon', 'Sour Orange', and P. trifoliata can be produced true-to-type from seed.
This is important for nurseries because virus is not transmitted through either nucellar or zygotic seed.
Thus, nurseries can produce virus-free, clonal rootstocks from seed.
Virus can be eliminated from infected clones.
However, because nucellar seedlings are juvenile it takes a long time to obtain productive clones.
These can then be propagated by budding from the indexed nucellar mother tree.
Breeding of citrus is made difficult because of the difficulty obtaining genetically variable populations.
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Is there some reference online that you can give that relates to what you wrote above? I'd like to read it.
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