Cytomorphological behaviour of primary trisomics in pearl millet (Pennisetum americanum (L.) Leeke).

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Abstract
The desynaptic plant showed univalents ranging 0-13 at diakinesis and metaphase I. In triploid plant 36% of the cells showed 8 chromosomes separating to 1 pole at anaphase I. The morphology, cytology and sterility studies were conducted in all the trisomics isolated. All the primary trisomics showed 6II + 1III or 7II at diakinesis and metaphase I. The frequency of trivalents was reduced at metaphase I. The trivalent resumed in chain of 3, V-, Y-, frying pan, S-, J- and 4-shape configurations. Based on cytomorphological distinction, the 16 trisomics were grouped in 5 classes as bushy, awned, slender, dark green and tiny.

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