Some interspecific plant hybrids show unequal transmission of chromosomes from parental genomes to the successive generations. It has been suggested that this is due to a differential behavior of parental chromosomes during meiosis. However, underlying mechanism is unknown. We analyzed chromosome composition of the F2 generation of Festuca × Lolium hybrids and reciprocal backcrosses to elucidate effects of male and female meiosis on the shift in parental genome composition. We studied male meiosis, including the attachment of chromosomes to the karyokinetic spindle and gene expression profiling of the kinetochore genes. We found that Lolium and Festuca homoeologues were transmitted differently to the F2 generation. Female meiosis led to the replacement of Festuca chromosomes by their Lolium counterparts. In male meiosis, Festuca univalents were attached less frequently to microtubules than Lolium univalents, lagged in divisions and formed micronuclei, which were subsequently eliminated. Genome sequence analysis revealed a number of non-synonymous mutations between copies of the kinetochore genes from Festuca and Lolium genomes. Furthermore, we found that outer kinetochore proteins NDC80 and NNF1 were exclusively expressed from the Lolium allele. We hypothesize that silencing of Festuca alleles results in improper attachment of Festuca chromosomes to karyokinetic spindle and subsequently their gradual elimination.

Department of Biology Federal University of Lavras 37200 000 Lavras MG Brazil

Department of Botany Palacký University 77900 Olomouc Czech Republic

Department of Crop Genetics John Innes Centre Norwich NR4 7UH UK

Institute of Experimental Botany of the Czech Academy of Sciences Centre of Plant Structural and Functional Genomics 77900 Olomouc Czech Republic

Institute of Plant Genetics Polish Academy of Sciences 60479 Poznan Poland

Molecular Plant Breeding Institute of Agricultural Sciences ETH Zurich 8092 Zurich Switzerland

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