BEHAVIOUR OF ACCESSORY CHROMOSOMES OFSECALE CEREALEIN ASECALE CEREALE×MONTANUMHYBRID

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Abstract
First and second generation hybrids from a cross between Secale cereale ''OAC'' (female carrying two Standard type accessory chromosomes and S. montanum were grown. Meiosis was studied to ascertain the effect of the chromosomes of S. montanum on the behavior of the acces-sory chromosomes and to test the hypothesis that accessory chromosomes in cereal rye were formed by interspecific hybridization of these species. The accessories did not pair with chromosomes of S. montanum and no change in their pairing behavior nor in the non-disjunction process resulted from the presence in the nucleus of foreign chromosomes.