Abstract:Dociostaurus genei is a grasshopper in which most of the autosomes present polymorphisms for distal heterochromatic supernumerary segments. C-banding, DAPI banding and fluorescence in situ hybridization (FISH) of a probe, which is representative of the highly repetitive DNA sequences comprising the segments, have been used to analyse the effects of the segments on chiasma formation. Results show that the supernumerary segments are associated with two major effects. First, a higher content of supernumerary hete… Show more
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Abstract:The evidence of increased crossing over rate in tomato hybrids infected with TAV (Tomato aspermy virus), PVX (Potato virus X), TMV (Tobacco mosaic virus), TMV+PVX indicates the recombinogenic effect of viral infection. Cytological studies of the early diakinesis in healthy and virus-infected tomato revealed significant changes in chiasma number and position. The most significant changes were established for bivalents with two interstitial chiasmata and with one terminal and one interstitial. The data obtained indicate redistribution of the chiasmata position and induction of additional exchanges. The virus-induced recombination is segment-specific and depends on the host plant genotype, virus infection and the interaction between them.
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