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Suppression of multivalent formation by B chromosomes in natural and artificial autopolyploids of scurvy-grass (Cochlearia L.)
Authors:Dr P P Gupta
Institution:(1) Department of Genetics, University of Liverpool, Liverpool, England;(2) Max-Planck-Institut für Züchtungsforschung, D-5000 Köln 30, Federal Republic of Germany
Abstract:Summary In diploid Cochlearia pyrenaica, its established natural autotetraploid C. officinalis, and their newly induced autotetraploid and auto-octoploid derivatives, B chromosomes change the normal pattern of chromosome association by suppressing homologous pairing. Frequency of bivalents increases at the expense of multivalents from lower to higher numbers of B chromosomes. The reduction of multivalents due to the direct influence of the B chromosomes, independent of pollen mother cell chiasma frequency, is suggested as being related to the mechanism that prevents A/B chromosome pairing.
Keywords:Chochlearia pyrenaica  Newly induced autopolyploids  Established natural autopolyploids  B chromosomes  Multivalent suppression
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