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Old March 14, 2013   #82
surf4grrl
Tomatovillian™
 
Join Date: Feb 2011
Location: field of dreams
Posts: 97
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Here is a better link -

http://agriinfo.in/default.aspx?page...3&topicid=1761

Pertinent quote -


Quote:
In this method, only one seed is selected randomly from each plant n F2 and subsequent generations. The selected seed is bulked and is used to grow the newts generation. This process is continue upto F5 generation. By this time desired level of homozygosity is achieved. In F6, large number of single plant, 200-500 are selected and their progeny are grown separately. In F7 and F8, selections are practised between progeny and superior progeny and are isolated based on preliminary replicated trial. The superior progenies are then tested in multiplication trails and the best progeny is identified for release.
The main objectives of single seed descent method is to rapidly advantage the generation of crosses and at the end of method a random sample of homozygous genotype is obtained.
It does not account for less plants, only seed randomization in F2 which is then bulked.

Quote:
General principles involved in this method is that, only one ( single) seed collected from each of the F2 plants ( 10000 to 20000) and then bulked to grow the next ( F3) generation.
& you can't short-change statistics, you still need a large population to stabilize a F7. Alot Tom's stuff is still segregating out.

But it is still not an "explanation" for the exponential spate of "grow-outs" and a real lack of documentation of these crosses. I know you are friends and eager to defend this, but you are comparing apples to oranges. Tom Wagner, a breeder of considerable experience and acumen, is no comparison for someone doing this for a few years.
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