Abstract
1. The cytogenetical studies were carried out on F1's (Triticum Timopheevi× Secale cereale) obtained by embryo-culture technique and open F2 progenies derived from them.
2. In somatic cells of F1's, 21 chromosomes were ascertained, and their modal chromosome configuration at MI of PMCs was in 1II+19II.
3. From two F1's, 26 mature open F2 plants were obtained, the 2n chromosome numbers of which varied from 23 to 30 successively, except one plant having 2n=41. No amphidiploid was to be found among them.
4. From the results of cytogenetical and morphological studies, it was concluded that all of the open F2 plants, except one having 2n=41, were natural back-crossed plants with the rye pollen, normal, accessory chromosomic or translocated with x-ray grown adjacent to F1's the preceding year.
Only one plant having 2n=41 was also proved to be a natural back-crossed plant with the common wheat pollen.
