For the 275 RILs of Set 2, 33 RILs containing 3 or more favorable alleles at the 7 marker loci had mean fiber bundle strength of 32.32 g/tex, while 242 RILs containing fewer than three favorable alleles had mean strength of 30.34 g/tex.
There was also a fairly high and positive correlation between mean fiber length and strength (mean r = 0.57), but no significant correlation between fineness and length or fineness and strength, although the 3 fiber traits, strength, length and fineness, are phenotypically associated in the 2 parents.
Elongation (ELO,%), micronaire (MIC), short fiber content (SFC,%), bundle strength (STR, g/tex), upper-half mean fiber length (UHM, mm), and uniformity index (UI,%) were measured by Cotton Incorporated's fiber measurement laboratory using a High Volume Instrument (HVI, USTER Technologies Inc., Charlotte, NC).
The strong positive association between elongation (ELO) and micronaire (MIC) in parents was broken in the RILs, however, a significant positive association between bundle strength (STR) and upper-half mean fiber length (UHM) was observed in the RILs.> -wrap-foot> ELO = percent elongation of fibers before breaking.
Standard objective test methods were used to measure mean fiber diameter and variability (at mid-staple and overall), prickle factor, comfort factor, mean fiber curvature and variability, medullation (white, beige, and light fawn samples only), laboratory scoured yield, mean staple length and variability, and mean staple strength and variability.
If the fiber length was to change, it would lead to change in the fiber strength.
High fiber strength is necessary to maintain a high σ0 without fiber rupture.
Fiber fineness is detected with weighing method while fiber strength is detected with single-fiber strength tester (Fu et al. 2008).
Fiber annealing further reduced fiber diameter and improved fiber strength and stiffness as temperature increased.
However, there exists a real case dealing with cotton spinning in which the three quality characteristics are Fiber Length, Fiber Strength, and Skein Strength.
