Abstract
AbstractThe occurrence and effect of B-chromosomes on meiotic characteristics and genetic recombination was studied in fifty pomegranate (Punica granatum L.) cultivars of Iran. The study revealed the presence of 0–5 of B-chromosomes in 23 cultivars out of fifty. These accessory chromosomes were smaller than the A-chromosomes and did not pair with them or among themselves. B-chromosomes could arrange themselves on the equatorial plane and move to the anaphase poles however they lagged in some cases controlling their accumulation in the daughter nuclei. Statistical analysis showed both significant increase and decrease in the mean number of chiasmata when B-chromosomes are present in some of the cultivars leading to a change in genetic recombination.
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