Abstract
Abstract The obtained and cytological investigated A. litigiosum x A. pulverulentum and A. pulverulentum x A. litigiosum F1 plants are diploids 2n e 2x = 16. Variously shaped bivalents with one or more chiasma formation, positioned in different chromosome regions were observed. Hybrids presented reduction of the chiasma frequency and number of ring type of bivalents, in comparison to the parent species. The close connection of the chromosome condensed chromatin regions with the nucleolus or with the nucleoli was established, as the assembly continued from the leptoten – zygotene to the dyplotene – early diakinesis stages. This suggested either transcriptional activity of ribosomal genes before these stages or existence of some activity of the “silenced” genes. The irregularities in chromosome behaviour during microsporogenesis in the F1 hybrids, especially the lower homology expression (66.4 and 61.1% of the pollen mother cells with regular chromosome pairing and formation of 8II), caused from the ...
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