Abstract

The objective of this study was to isolate, distinguish, and characterize the trisomics of a specific cultivar of Sorghum vulgate Pers. Five of 10 possible primary trisomics were derived from a triploid and were increased. They are as follows:

1. Small-glume trisomic — glumes yellowish and small in a flexible-branched panicle; late flowering

2. Stiff-branch trisomic — panicle grayish.green with stiff branches; seed brightly colored

3. Cone trisomic — panicle pointed at emergence, becoming cone-shaped as flowering progresses

4. Large-glume trisomic — panicle rather open-topped with large glumes

5. Bottle-brush trisomic — panicle straight-sided and white at the apex when it emerges

Each of these trisomics sets stone seed when crossed with other stocks and transmits the trisome chromosome with a frequency sufficient to make recovery feasible in the F₁ progeny. One can distinguish hybrid progenies if he is familiar with the characteristics of the trisomics within the parent cultivar.

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