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instead of into CS, which has many unfavorable features from the agronomic point
of view.
When the Mv9 kr1 line was pollin ated with the old Hungarian rye cultivar
Lovászpatonai (Molnár-Láng et al. 2002 ), the mean crossability percentage was
fairly high (68.4 %) The chromosome number distribution was examined in mitotic
chromosome spreads of the octoploid triticale obtained via colchicine treatment on
the initial hybrid and was found to range from 51 to 56. All the rye chromosomes
were identifi ed in mitotic chromosome spreads of octoploid triticale with the help
of C-banding and were detected using genomic in situ hybridization (GISH) (Nagy
et al. 1998 ). High seed set (37.4 %) was achieved when the Mv9 kr1 wheat line was
pollinated with Aegilops biuncialis (Logojan and Molnár-Láng 2000 ). This was
higher than that reported earlier by Mustafaev and Piralov ( 1980 ) and Özgen ( 1983 ).
Similarly good seed set was achieved when the Mv9 kr1 line was crossed in
Martonvásár with other Aegilops species ( Ae. geniculata , Ae. triuncialis , Ae. cylin-
drica , Ae. tauschii , unpublished data), with Thinopyrum species (unpublished data)
Fig. 4.2 Spike morphology of wheat cultivars Mv9 ( a ), and Chinese Spring ( b ), and wheat lines
Mv9 kr1/BC 5 ( c ) and Mv9 kr1/BC 6 ( d ) having high crossability with rye. Crossability allele kr1
was transferred from CS into Mv9 from a Mv9 × CS hybrid via backcrossing with Mv9. Plants with
recessive kr1 alleles were selected on the basis of the seed set with rye. The development of the
Mv9kr1 line is demonstrated in Fig. 4.1
M. Molnár-Láng