Abstract
The study deals with the effect of B-chromosomes on A-chromosome chiasma frequency, chiasma distribution and pollen fertility in Pennisetum typhoides. Results indicate that B-chromosomes enhance the number of interstitial chiasmata in A-chromosomes thereby increasing the chiasma frequency. Variation in chiasma frequency and distribution could be observed not only between carrier and non-carrier plants but also between carrier and non-carrier pollen mother cells (PMCs) of carrier plants. Mild reduction in fertility of carrier plants, in comparison to non-carriers, could also be noticed. The probable mechanism of B-chromosome action has been discussed in light of earlier works. Metaphase and anaphase behaviour of B-chromosomes have also been dealt with in brief.
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