Abstract: Abstract：【Objective】Identify the F2 PMCs chromosome variations of five crosses of wheat-A. cristatum (L.) Beauv. addition lines hybridized with China spring-Ae.cylindryca Host. gametocidal chromosome 2C disomic addition line and the types and frequencies of the chromosome variations induced by gametocidal chromosome in order to construct wheat- A. cristatum (L.) Beauv．translocation lines.【Method】The chromosome variations of F2 PMCs was observed using the routine method and P genome were detected by GISH.【Result】The results showed that plurivalents , multi-univalents , lagging chromosomes and chromosomes fragments was observed in PMCI metaphase in all of F2 hybrid crosses, chromosome bridges in most of crosses and ring chromosomes in very few crosses．The frequencies of F2 aberrant chromosome are as follows in mean : 36.72% cells with plurivalent, 20.16% cells with multi univalent, 30.86% cells and 11.7% cells with fragments and chromosome bridges respectively. Multifid quadrants and retrogression were observed in PMCI metaphase in certain crosses. Many different size microkernels are observed in dimidiate and quadrants. Five crosses had different self seed setting percentage from 23.9% to 40.95%. The result showed that the P genome usually was univalent in some F2 crosses detected by GISH．【Conclusion】These aberrations of chromosome behaviors indicated that the gametocidal chromosome was effective in the meiosis of the formation of gametes. The gametocidal chromosome 2C had a different effect on fertility in various wheat-Agropyron chromosome addition lines.

Key words: Wheat –Agropyron addition lines, Gametocidal chromosome, Cytological traits