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Meiotic Behavior of a Hodo Sorgo x Johnsongrass Hybrid¹

Meiosis Of ‘Hodo’ sorgo was slightly more irregular than that reported for other varieties of Sorghum bicolor, notably by having a higher frequency of quadrivalent associations. Meiosis of the fertile interspecific S. bicolor x S. halepense hybrid was almost as regular as that of S. halepense, johnsongrass, and suggests close genomic relationship of the parental species. The 2n chromosome number was 20 for Hodo sorgo, 40 for johnsongrass, and 40 for the interspecific hybrid. The mean chromosome association was: Hodo sorgo, 8.2 II, and .91 IV; jonhsongrass, .19 I, 11.81 II, .09 III, 3.31 IV, .09 V, .28 VI, and .06 VIII; F₁ hybrid, .04 I, 7.2 II, .17 III, 4.6 IV, .02 V, .7I VI, .02 VII, and .27 VIII. The frequent occurrence of quadrivalents in the hybrid suggests that part of the parental chromosomes are quite similar if not identical. Although the origin of octoploid (2n=40) johnsongrass is uncertain, experimental evidence substantiates the hypothesis that the species is an autopolyploid derived from S. bicolor.

² Research Agronomist, Crops Research Division, ARS, USDA, and Professor of Crop Management, Mississippi Agr. Exp. Sta., State College, Miss.

Received for publication September 13, 1965.