title: Presence and behaviour of B-chromosomes in Acanthophyllum laxiusculum (Caryophyllaceae).
abstract: Two karyotypic variants were recognized in populations of Acanthophyllum laxiusculum Schiman-Czeika. Variant A had 2N = 30 and variant B showed the presence of 0 to 3 B-chromosomes in addition to 2N = 30 chromosomes. Analysis of chromosome behaviour at meiosis showed that the presence of B-chromosomes increases chiasma frequency in A-chromosomes; this effect was higher for plants with odd numbers of B-chromosomes compared with plants with even numbers of B-chromosomes. Comparisons of variants A and B, suggests that B-chromosomes have an effect pollen stainability and seed production. It seems that the presence of B-chromosomes may increase pollen stainability and seed production in variant B.
authors.affiliation: Institute of Biochemistry & Biophysics, University of Tehran, Iran.
authors.forename: S M
authors.initials: SM
authors.lastname: Ghaffari
authors.forename: A
authors.initials: A
authors.lastname: Bidmeshkipoor
mesh_terms: D001519:Behavior; D029748:Caryophyllaceae / Q000166:cytology* / Q000235:genetics; D002875:Chromosomes / Q000235:genetics*; D015342:DNA Probes; D018744:DNA, Plant; D017404:In Situ Hybridization, Fluorescence / Q000379:methods*; D007621:Karyotyping; D008540:Meiosis / Q000235:genetics; D008677:Metaphase; D008938:Mitosis / Q000235:genetics; D011058:Pollen / Q000235:genetics*; D012639:Seeds / Q000235:genetics*
chemical_list: D015342:DNA Probes; D018744:DNA, Plant