Introgression from Gossypium mustelinum and G. tomentosum into upland cotton, G. hirsutum

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Introgression from Gossypium mustelinum and G.
tomentosum into upland cotton, G. hirsutum

• Brian W. Gardunia
• David Stelly
• C. Wayne Smith

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G. tomentosum

• G. mustelinum

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Loose ends

• Experiments in Mexico
• Molecular data
• Composite generations and selections
• Quantile analysis of fiber distributions

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G. mustelinum in Mexico
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Height in Mexico
College Station 03
Mexico
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G. mustelinum

• Mexico

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Length
G. mustelinum
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Mexico UHM Fiber length
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Molecular data

• Markers from chromosome 11 on 50 individuals
  from each population
• Purpose to measure change in linkage
  relationships and allele frequencies

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Decrease in map length
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SSRs show decrease in G. mustelinum alleles

• Boxplots individual plant heterozygosity
• Red circles G. mustelinum allele frequency

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G. tomentosum
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G. tomentosum maps
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G. tomentosum SSRs show decrease in
heterozygosity but maintenance of donor alleles

• Green G. tom allele freq.
• Boxplots heterozygosity

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Composite

• Large random mating populations with improved
  agronomic characteristics
• Accessible for incorporation in standard breeding
  populations

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Advanced backcross composite
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Proposed breeding scheme for composite generations
Syn3
Sterile Ms4ms4
Fertile
OP or self
F2 family
IPS
F3
Bee rm
IPS or Family
Syn 4
F4
IPS or Family
Sterile Ms4ms4
Fertile
Replicated testing and yield trials
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Distribution of fiber quality
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Yield data 2006
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Quantile regression

• Similar to standard regression except allows for
  estimation along entire distribution, not just
  mean values
• Graphical as well as statistical interpretation
• Can be applied to Lw, Ln, Fineness or maturity
  distributions
• Available as option in SAS and R.

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Quantile regression anova table
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Lw Quantile regression
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More loose ends

• Repeat of Mexico GMA experiment
• G. tomentosum pollination effects
• More molecular data
• Different populations?
• Quantile regression

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G. tomentosum
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Plant Height
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