The Journal of Heredity 1988:79(3):216-218
© 1988 The American Genetic Association 79:216-218
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Cytology and Breeding Behavior of a Partially Fertile Triploid Pearl Millet
University of Georgia, College of Agriculture Experiment Stations and Coastal Plain Experiment Station, Agronomy Department Tifton
USDA-ARS, Coastal Plain Experiment Station, Agronomy Department Tifton
Address reprint requests to Dr. Hanna, USDA-ARS, Dep. of Agronomy, Coastal Plain Experiment Station, Tifton, GA 31793.
Abstract
A triploid (2n = 3x = 21) pearl millet, Pennisetum glaucum (L.) R. Br., was found in an open-pollinated progeny of tetraploid (2n = Ax = 28) inbred Tift 239DB. The triploid pearl millet was more, robust and 50% taller than its tetraploid parent. Meiotic chromosome behavior was irregular, with a mean trivalent frequency of 3.1 and a maximum of 7.0. Anaphase I distribution was irregular, with 11:10, 12:9, 13:8, and 14:7 chromosomes at each pole. The triploid was partially male fertile, with 67% stainable pollen, and partially female fertile. Crosses between cytoplasmic male sterile diploid Tift 23A and the triploid produced 14- and 15-chromosome offspring. Somatic chromosome numbers of 14, 15, 16, 17,19, 23, 27, and 28 were found in the progenies from the open-pollinated triploid and in triploid x diploid Tift 23B crosses. Aneuploids with 22 and 23 chromosomes also were obtained in reciprocal crosses between the triploid and tetraploid Tift 239DB. Primary trisomics (2n = 15) were produced by using the tnploid as either the male or the female parent. However, trisomics were more frequent in the 3x x 2x crosses Also, trisomy was the most frequent type of aneuploidy in pearl millet.
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