Tertiary trisomics and their use in pearl millet improvement.

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Abstract
Nineteen tertiary trisomics were isolated from some translocation heterozygotes and interchange trisomics of pearl millet. Cytological analysis of these trisomics indicates that chromosome association of trivalents, univalents and pentavalents were frequent in all the trisomics. But their ratio varied from one trisomic to the next. Other associations were relatively infrequent. The relative frequencies of 6 pentavalent configurations observed in different trisomics were studied and their probable association with mode of fertility and transmission rates have been discussed. Furthermore, the techniques for isolation of balanced tertiary trisomics and their further use in production of hybrid seeds in pearl millet have been discussed.