meiotic studies of some avena species and populations in iran

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eleven populations of five avena species were analysed for meiotic characters including chiasma frequency and distribution as well as chromosomal association and segregation. plants of a single population of a. eriantha showed the presence of 2n = 14 (diploid) and 2n = 4x = 28 chromosome number. populations of a. barbata and a. wiestii possessed n = 14, while populations of a. sterilis ssp. ludoviciana possessed 2n = 6x = 42 (hexaploid) chromosome number. tetraploid and hexaploid species showed diplontic behavior and formed only bivalents. the species and populations studied differed significantly in the frequency of chiasmata. b-chromosomes occurred in some of the species studied. cytomixis and chromosome elimination led to aneuploid and unreduced pollen mother cell formation in the species studied.

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Journal title:
journal of sciences islamic republic of iran

جلد ۱۴، شماره ۲، صفحات ۰-۰

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