Cytology and breeding behavior of trisomics in jute corchorus olitorius

Paria, P.; Basak, S.L.

Indian Journal of Genetics and Plant Breeding 39(3): 471-479


ISSN/ISBN: 0019-5200
Accession: 005087127

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Cytological and breeding behavior of 7 possible primary trisomics of C. olitorius L. was analyzed. The frequency of trivalent formation was not dependent on the length of the extra chromosome. Trivalents in the form of chain were most frequent in most of the trisomics. In the majority of PMC the extra chromosome moved to either of the poles during anaphase-I. The univalents lagging during anaphase I divided equationally and the resulting half chromosomes moved to opposite poles. Though a marked reduction in pollen fertility was not observed, a definite reduction in ovule fertility and seed set per pod was observed in all the trisomics. The average frequencies of trisomics in selfed, (2n + 1) .times. 2n, and 2n .times. (2n + 1) progenies were 8.60, 14.26 and 2.21%, respectively. The frequency of individual trisomics varied between 0.83 and 22.48% in different progenies. There was no apparent relationship between the length of extra chromosome and the rate of its transmission in different progenies.