Heredity - Abstract of article: Combined genetic and cytological analysis of positive and negative interference in an interchange heterozygote of rye (Secale cereale L.)1

Heredity (1980) 44, 83–92; doi:10.1038/hdy.1980.7

Combined genetic and cytological analysis of positive and negative interference in an interchange heterozygote of rye (Secale cereale L.)¹

J Sybenga² and I Mastenbroek²

²Department of Genetics, Agricultural University, Wageningen

¹Dedicated to Professor Dr Hans Bauer on the occasion of his 75th birthday.

Received 11 July 1979.

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Abstract

Segregation of a translocation breakpoint and two marker genes, located in different non-translocation arms, showed strong negative interference between the segments bordered by the markers and the translocation. Cytological data indicated a similarly strong negative interference between the interstitial segments, which make up part of the segments analysed genetically. Since coincidence is stronger than compatible with random anaphase II segregation of chromatids, it is suggested that the relatively proximal chiasmata involved in recombination in the segments analysed, cause chromatid pre-orientation, leading to preferential A II segregation.

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