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Asummary of this article appears in Asexual reproduction. |
I think apomixis is used with all organisms, not just plants. Parthenogenesis also. Actually parthenogenesis and apogamy are types of apomixis!
I agree entirely, this article is a mess. It is such a mess that I don't feel that I have time to clean it up completely either, perhaps over the next few months. I've recently been working through the whole terminology tangle for an article (Talent, N. (2009). "Evolution of gametophytic apomixis in flowering plants: an alternative model from Maloid Rosaceae". Published online 5 Mar 2009 Theory in Biosciences. It was rather nice to see that the tangle is not just due to silliness, but due to the extreme difficulty of the subject. Winkler 1908 found that he had to replace the term apogamy with a new one (apomixis) because of confusion (apogamy is still used in ferns). We are having a similar problem now with "gametophytic apomixis" because the division between it and adventitious embryony is artificial ...
It's nice to find someone else who cares and understands this material! Nadiatalent (talk) 13:30, 13 April 2009 (UTC)Reply
I found very very few google hits to terms like 'prickle pollination' (Gynogenesis, apparently), androgenesis, 'monohaploid' and 'double haploid' (currently trying to understand some potato breeding literature). I for one would really appreciate some work on these articles. You guys are the experts and its confusing for you! Think about people trying to learn this stuff from scratch! ;-) All the best, --Dan|(talk) 13:38, 27 April 2009 (UTC)Reply
Hi Dan,
I don't know about prickle pollination either, I suspect that it might be used for more than just gynogenesis, perhaps including parthenocarpy. Monohaploid would seem to be the product of halving a diploid (i.e. it is monoploid, and originated by haploidy), see the ploidy page under "polyhaploidy and dihaploidy". For Double haploid I've added a redirect to Doubled haploidy. See also the previously mentioned part of the ploidy page, some modern plant breeders have forgotten that good old terminology and use dihaploid instead, which is totally ambiguous. Over to you to suggest whether a redirect would be useful for monohaploid. Nadiatalent (talk) 13:10, 14 June 2009 (UTC)Reply
In this paragraph, the sentence begining with "thus" is a non-sequitur. It does not follow logically from what cam before, as "thus" would imply.
68.194.106.90 (talk) 19:19, 26 May 2011 (UTC)Comma ServiceReply
Some material was recently added that equates the increased production of sexual offspring in (one group of) facultative apomicts under stress conditions with meiosis as a DNA repair mechanism. I think that is quite a stretch. Any number of other mechanisms are possible, such as for example a less vigorous nucellus that isn't large enough for aposporous initials to arise, a genetic mechanism that is triggered in response to stress that has had an advantage through natural selection because sexually produced offspring have had better chances of survival in stressful (changing) conditions ... This is a much less well-understood phenomenon than the current text indicates, and I consider it quite misleading. I've also removed the statement about Boechera holboellii on the grounds that this species might be unusual in its behaviour; what would be needed here is a general survey of the behaviour of large numbers of apomictic species. Sminthopsis84 (talk) 00:49, 2 November 2012 (UTC)Reply
I think we should add this section
proposals and research into creating genetically modified food plants that exhibit apomixis exist. The advantage of this over normal hybrids is that as clones, the daughter plants would be identical to the parent plants, which is not always true with commercial hybrid strains and hence the farmer needs to buy new seed from the company at every planting
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3747320/
"Box 4. Apomixis
One way to minimize the problems associated with gene flow is to introduce sterility, such that pollen cannot transmit information. Richard Jefferson has high hopes for an accessible, cheap way for farmers to produce genetically superior seeds, called apomixis.
But similar concepts have been floated before. The controversial terminator technology prevented gene flow, but it also outraged activists because it kept farmers from reusing seed.
Unlike terminator, apomixis is “germinator” technology—avoiding fertilization altogether by producing seeds without pollination. In effect, seeds can be natural clones of the mother, instead of a genetic exchange between mother and father. Therefore, hybrid quality can be maintained as farmers use seed year after year.
Although apomixis occurs naturally in about 400 plant species, Jefferson believes that it can be successfully developed as a useful trait in other crop plants. To ensure its widespread availability, Jefferson and collaborators pledged not to create restrictive patent rights that could block the development of apomixis."
http://www.plosbiology.org/article/info%3Adoi%2F10.1371%2Fjournal.pbio.0000008
Why does "androgenetic" redirect to this page? That's just *weird*! Wahrmund (talk) 16:17, 28 January 2016 (UTC)Reply