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Karyotype and B chromosomes of Musa rubra Wall.

P. K. Agarwal

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Abstract

Detailed karyotype studies in Musa rubra Wall. revealed the presence of 2n=22+B-chromosomes. Karyotype was found to be of symmetrical type and was placed in 3A category of the 12 categories recognized by Stebbins (1971). B-chromosomes were found to occur in roots and pollen mother cells. Possible origin of these chromosomes by breaking up of satellites at secondary constriction regions and further acquisition of centromeric activity by these broken satellites have been suggested.

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Detailed karyotype studies in Musa rubra Wall. revealed the presence of 2n=22+B-chromosomes. Karyotype was found to be of symmetrical type and was placed in 3A category of the 12 categories recognized by Stebbins (1971). B-chromosomes were found to occur in roots and pollen mother cells. Possible origin of these chromosomes by breaking up of satellites at secondary constriction regions and further acquisition of centromeric activity by these broken satellites have been suggested.

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Available abstract

Detailed karyotype studies in Musa rubra Wall. revealed the presence of 2n=22+B-chromosomes. Karyotype was found to be of symmetrical type and was placed in 3A category of the 12 categories recognized by Stebbins (1971). B-chromosomes were found to occur in roots and pollen mother cells. Possible origin of these chromosomes by breaking up of satellites at secondary constriction regions and further acquisition of centromeric activity by these broken satellites have been suggested.

Key concepts: Karyotype, Biology, Secondary constriction, Mother cells, B chromosome, Botany, Pollen, Chromosome

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