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The Relationship Between F₂ and Selected F₃ Progenies in Cotton (Gossypium hirsutum L.)¹

Yield, components of yield, and fiber determinations of five parental lines of cotton (Gossypium hirsutum L.) and their 10 F₂ hybrids were made at Stoneville, Mississippi in 1968. These results were then related to the 1969 F₃ performance at the same location of eight random, eight high yield, and eight high strength selections from each cross.

The linear correlation coefficient for the F₂ and mean F₃, yield was .48 and not significant. The F₂ hybrids, therefore, gave little information regarding which cross to use when selecting for lint yield. However, high correlations between the F₂ and F₃ for lint percent, seed index, and fiber length, strength, and elongation were detected. The performance of F₂ was a good indication of these traits.

Differences in yield, lint percent, seed index, fiber length, and fiber strength among the three selection types were observed. The yield selections produced 5.7% more lint than the random and strength selections. However, the increased yield was partially at the expense of fiber properties. The average length and strength of the fiber quality selections were slightly greater (1.0%) than the random entries. There was no significant difference in yield between the random and high strength selections.

Key Words: Variety improvement • Correlated response • Yield • Agronomic traits • Fiber properties

² Research Geneticist, ARS, USDA; and Plant Breeder, Delta Branch of the Mississippi Agricultural and Forestry Experiment Station, Stoneville, Miss. 38776.

Received for publication September 5, 1972.

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