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Flat-Square in Cotton, Acala Type. I. Its Mode of Inheritance and Heritability¹

Flat-square, an unidentified flower disorder in cotton (Gossypium hirsutum L.) which is manifested at bloom time, appeared on a large scale in Arizona during 1962. Part of this study was designed to verify the mode of inheritance and heritability of this disorder.

Three homozygous inbred lines of Acala-type cotton known to exhibit flat-square were intercrossed with a doubled haploid line free from flat-square. Seeds of the F₁, F₂, BC_Df, and BC_f generations were grown simultaneously with the parental populations to evaluate its mode of inheritance and heritability.

Flat-square was found to be quantitatively inherited, with low heritability. The estimates of the genetic parameters indicate that the inhertance is mostly additive in nature with no evidence of epistasis or maternal effect.

Key Words: Genetic parameters • Additive effects • Dominance effects • Epistatic effects

² Presently Senior Cotton Breeder, Shambat, P. O. Box 30, Khartoum North, Sudan (former Graduate Student at the University of Arizona); Instructor, Department of Biological Sciences, and Professors in the Department of Agronomy and Plant Genetics, University of Arizona, respectively.

Received for publication September 22, 1973.