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Inheritance of Lint Quality Characteristics in Interspecific Crosses of Cotton¹

In interspecific crosses between varieties of upland (Gossypium hirsutum L.) and Egyptian (G. barbadense L.) cotton, tested in Israel from 1959 through 1965, F₁ performance for upper-half-mean and mean lint length exceeded that of either parent by 10 to 16% and 6 to 13%, respectively. The uniformity ratio of F₁ plants was slightly lower than the parental mean. F₂ performance for lint length was slightly above parental mean, but a significant F₂ deviation was detected for this trait. There were indications that additive, dominance, and additive x additive epistatic effects were operating in the inheritance of lint length.

The tensile strength (1/8-in. gauge, i.e. T₁ of the F₁'s lint was almost as high as that of the stronger G. barbadense parental varieties. The magnitude of heterosis was 9 to 15% for this trait, with no F₂ or backcross deviations. This indicated that only additive and dominance effects were operating in the inheritance of lint strength.

Micronaire measurement of lint fineness was much lower in F₁ hybrids than in either parent (a negative heterosis of 12 to 19%). Only the dominance effects were detected as operating significantly in the inheritance of this trait, but there were considerable deviations from the model with no epistasis.

Significant effects of general combining ability were found for lint length and tensile strength. Additive gene-action was predominant for these traits. Dominance effects were the main cause of heterosis for all the traits of lint quality examined.

Key Words: lint length • lint uniformity ratio • lint strength • lint fineness • heterosis • Gossypium

² Senior Lecturer, Department of Field and Vegetable Crops.

Received for publication February 12, 1968.

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