Abstract
The nucleolar organizer activity and the presence of rDNA zones were studied in Tricepiro Don Rene ´ INTA, a synthetic forage crop (2n=42, 6x, AABBRR with introgression of Thinopyrum in 6A chromosome). The use of pTa71 probe revealed the presence of six rDNA zones but Ag-NOR indicated the presence of only four NORs (nucleolus organizer regions). Differential amphiplasty phenomenon could explain the inactivity of some rDNA zones. Simultaneous use of FISH (pTa71 probe) and DAPI banding analysis indicated that the chromosomes with rDNA zones belong to two rye and to four wheat chromosomes. The maximum number of nucleoli observed in so- matic cells and the number of chromosomes with secondary constrictions agreed with the four active NORs detected with the Ag-staining method. The use of the pSc119.2 probe allowed to recognize that chromosomes with secondary constrictions are the wheat chromosomes 1B and 6 B. The results obtained using classical and molecular cytogenetics lead us to conclude that this crop has a similar be- havior to that observed in hexaploid triticales in relation to the phenomenon of amphiplasty. Furthermore, the com- plexity of genetic interactions between wheat and rye genomes described in triticales, are not modified by the pres- ence of Thinopyron introgression in Tricepiro Don ReneINTA.
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