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Selection and Inbreeding Method Effects on Upland Cotton Yield and Fiber Properties

Selection and Inbreeding Method Effects on Upland Cotton Yield and Fiber Properties. Beltwide Cotton Conferences New Orleans, LA January 12, 2007. D. B. Weaver, R. S Badger, and E. van Santen. Objectives.

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Selection and Inbreeding Method Effects on Upland Cotton Yield and Fiber Properties

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  1. Selection and Inbreeding Method Effects on Upland Cotton Yield and Fiber Properties Beltwide Cotton Conferences New Orleans, LA January 12, 2007 D. B. Weaver, R. S Badger, and E. van Santen

  2. Objectives • Determine effect of inbreeding method [pedigree (PED) vs. bulk (single-seed descent, SSD)] on mean yield and fiber quality of six cotton populations, and • Determine genetic correlations among traits

  3. Materials and Methods • Six populations were studied • Parents were adapted cultivars or elite breeding lines, non GMO, typical parents in a cotton improvement program • F2:3 lines grown in the field in 2003 (PED), along with F3 bulks (SSD) • F3:4 lines (PED) and F3:4 (SSD) grown in field in 2004

  4. Parents and Populations

  5. Materials and Methods • All generations advanced by self-pollination where possible. • F2:3 lines were sampled by collecting a 5-boll sample from each of 3 representative plants. • F3 single plants were evaluated for three traits, and a selection index was applied:

  6. Traits evaluated • Lint weight per seed (LWS, component of yield) • Short fiber content (SFC, determined by AFIS) • Upper quartile length (UQL, determined by AFIS) • Variables were standardized (subtract mean and divide by standard deviation) and summed (SFC treated as a negative value) • Best lines, as determined by selection index, tested as PED lines in 2005

  7. Materials and Methods • F3:5 lines, inbred by both methods, were grown in the field during 2005 • Plots were 4 rows, 6.1 m long, on 1 m row spacing • RCB design, 3 reps, genotypes nested within inbreeding method • Method fixed; genotypes, blocks random

  8. Lines per population

  9. Genetic Correlations calculated as ρ = covxy÷√σ2x σ2y Where x and y are two different traits

  10. Lint yield Lint percentage Lint weight per seed Boll weight HVI fiber properties: Micronaire Fiber length T1 (strength) E1 (elasticity) Uniformity index Short fiber content Traits evaluated

  11. Results: Lint Yield (lbs/A)

  12. Results: Lint wt/seed (g × 102) * Indicates significance at the 0.05 level.

  13. Results: 50% SL (inches)

  14. Results: Short Fiber Content (%)

  15. Results: Micronaire * Indicates significance at the 0.05 level.

  16. Genetic Correlation of Fiber Strength with… _is the median correlation among five populations

  17. Genetic Correlation of Micronaire with… _is the median correlation among five populations

  18. Genetic Correlation of Fiber Length with… _is the median correlation among five populations

  19. Genetic Correlation of Lint Yield with… _is the median correlation among five populations

  20. Conclusions • For most traits and populations, inbreeding method had little effect • Genetic correlations vary greatly by populations; some “traditional” negative correlations still exist to a large degree • Fiber strength tends to correlate negatively with yield components • Fiber length tends to correlate negatively with yield components • Micronaire tends to correlate positively with yield components

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