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The Journal of Heredity 1985:76(3):215-216
© 1985 The American Genetic Association 76:215-216

other

Knob-6, a cytological marker for chromosome 6 of Gossypium hirsutum L.

M. S. Brown, S. A. Naql, M. Y. Menzel, and D. M. Stelly

The first, second, and fourth authors are, respectively, professor emeritus, research associate, and assistant professor, Department of Soil and Crop Sciences, Texas A & M University, College Station, TX 77843. The third author is professor of genetics, Department of Biological Science, Florida State University, Tallahassee, FL 32306. This work was supported in part by Regional Project S-77. Manuscript preparation was supported in part by U.S. Department of Agriculture competitive grants office 59-2123-1-1-6360. Contribution from Texas Agricultural Experiment Station as technical article No. 19881. Reprint requests may be addressed to Dr. Menzel or Dr. Stely.

Abstract

A cytological marker consisting of a knob of extra chromatin at the end of one arm of a large chromosome was discovered in homozygous condition in a strain of cotton (Gossypium hirsutum) from Uganda. That the knobbed chromosome was large suggested that it belonged to the A genome. Tests with translocations involving A-genome chromosomes suggested that the knob was on chromosome 6. The knob greatly reduces chlasma formation in the arm bearing it but not in the other arm or in other chromosomes. Knob-6 is a useful marker because it is easily maintained in homozygous condition by self-pollination and is readily discerned cytologically.


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