Selfish Genetic Drive of B Chromosomes in Diploid and Autotetraploid Coriander (Coriandrum sativum L.)
2022
Kumar, G. | Pandey, A.
Present investigation deals with the reporting of 1B and 2B chromosomes in Coriandrum sativum L. that had previously not reported. Study deals with the influence of B chromosomes on chiasma frequency, distribution pattern and pollen fertility in carrier and non-carrier MMCs of carrier plants and MMCs of non-carrier diploid and autotetraploid plants of coriander. Results envisaged that the presence of B chromosomes enhances the chiasma frequency in carrier MMCs of carrier diploid and autotetraploid plants in comparison to non-carrier plants. However, there is a moderate reduction in pollen fertility due to presence of B chromosomes. It was noticed that the higher number of B-chromosomes have greater influence on rate of chiasma distribution. In autotetraploid plants, the rate of bivalents and multivalent associations is greatly influenced due to the presence of B chromosomes in comparison to diploid ones. The probable mechanism of B chromosome machinery of action has been discussed in accordance with the light of earlier works. B chromosomes, we noticed to behave as univalents when unpaired or behave as bivalent when present as paired but do not aligned at the equator or either of the poles however they remain as lagging chromosomes at periphery of the cells. Further, the study of Bs might be used to explore the unrevealed facts regarding their organisation, function, evolution of genomes and how they retain themselves as selfish elements by using machinery of host genomes.
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