MEIOSIS IN PLANT CARRYING 2n = 21 CHROMOSOMESTELO-TRISOMIC (2n + t = 21)

Abstract

Coix L. a genus which is very much known for the chromosomal variations within its species. The aneuploidy to polyploidy and hybridization is common in the genus as it has ill-defined species or cytological forms growing in the same habitats. The meiotic abnormalities have reported many times in the Coix aquatica, C. gigantea and C. lacrymajobi. But the presence of telo-trisomic condition is not so common which has been reported in self-pollinated population of C. gigantea with mosomictelo-trisomy. Morphologically the plant was similar to diploid plants, so investigated for the meiotic behavior of a telo-chromosme during various stages of the meiosis. During the study method of single plant cytology has been followed. Telo-chromosome showed the varied behavior sometimes it behaved like normal chromosomes especially during meiosis I but in considerable number of meiocytes behaved abnormally to give the tetrads with variable number of micronuclei in the tetrads after meiosis II. Telo-chromosme though a fragmented part of the chromosome might be getting included in some the gamete instead of its disintegration and elimination by the nature as a corrective measure.