Pak. J. Bot., 39(1): 85-91, 2007. | Back to Contents | ||||
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Updated: 09-07-09 | ||||
B-CHROMOSOMES IN IRANIAN POMEGRANATE (PUNICA GRANATUM L.)
CULTIVARS Abstract: Programs for screening the genetic and cytogenetic diversity among Punica
granatum L., cultivars of Iran are in hand, therefore cytogenetical
study of 22 Punica granatum cultivars was carried out for the
occurrence and effect of B-chromosomes in genetic recombination of the
cultivars possessing them. The study revealed the presence of 0-5 B-chromosomes
in 17 cultivars out of 22. 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
a significant increase in the mean number of chiasmata when B-chromosomes
are present in some of the cultivars leading to a change in genetic
recombination.
Department of Biology, Shahid Beheshti University, Tehran, Iran. |
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