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The St. P, and Y genomes are three important genomes in the tribe Triticeae, which includes many perennial species. To study polymorphisms within the chromosomes of the St, P, and Y genomes, a G1SH-F1SH method was developed that allowed them to be clearly distinguished. The karyotypes of five individuals from population Z1925 of Kengyilia grandiglumis (Keng) J.L. Yang et al. (2n = 6x = 42, StStPPYY) were analyzed. The results showed thai there were structural polymorphisms in all of the chromosomes from the three individual genomes. The polymorphisms were found mainly in the terminal regions of chromosomes and infrequently near the centromeric region. Of all the chromosomes, 1P, 1St, 1Y, 2Y, 3St, and 3Y showed the most polymorphisms. The polymorphisms within the individual chromosomes suggested that more extensive and scientific conclusions regarding the origin and evolution of genomes in wild species of Triticeae would be achieved by studying a population as a sampling and analysis unit. Key words: Triticeae, StPY genomes. G1SH-FISH, chromosomal structure, polymorphism. Les genomes St, P et Y sont presents chez plusieurs membres importants de la tribu des triticees, laquelle comprend plusieurs especes perennes. Afin d'etudier le polymorphisme au sein des chromosomes des genomes St, P et Y, une methode combinant des analyses GISH el FISH et permettanl de distinguer clairement ces chromosomes a ete mise au point. Les caryoiypes de cinq individus de la population Z1925 du Kengyilia gmndiglumis (Keng) J.L. Yang el al. (2n = 6x = 42, StStPPYY) ont ete analyses. Les resultants montrent qu'il y a du polymorphisme struciurel chez, tous les chromosomes de ces trois genomes. Les polymorphismes ont ete observes principalement au sein des regions terminales et, plus rarement, pres des regions centromeriques. De tons les chromosomes, 1P, 1St, 1Y, 2Y, 3St et 3Y etalent les plus polymorphes. Les polymorphismes au sein des chromosomes individuels suggerent que. pour arriver a des conclusions plus larges et mieux fondees scientifiquement sur l'origine et revolution des genomes au sein des especes sauvages de la tribu des triticees, il faudrait etudier une population en tant qu'unite d'echantillonnage et d'analyse. Mots-cles : triticees, genomes StPY, GISH-FISH, structure chromosomique, polymorphisme. [Traduit par la Redaction], Introduction There are 23 basic genomes in the tribe Triticeae (Dewey 1984: Love 1984), and the St, P, and Y genomes are important genomes of this group. The six perennial [...]