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Journal of Applied Genetics 46(2), 2005, pp. 157-161

Production and characterization of amphiploids of Aegilops kotschyi and Ae. biuncialis with Secale cereale, and of backcross hybrids of Ae. biuncialis S. cereale amphiploids with 2x and 4x S. cereale

Barbara Wojciechowska, Hanna Pudelska


Abstract: Amphiploids (2n = 6x = 42) of Ae. kotschyi and Ae. biuncialis with self-compatible S. cereale were produced from F1 sterile hybrids (2n = 3x = 21) through colchicine treatment and callus tissue regeneration. The amphiploids resembled the F1 plants in overall morphology, but were larger in all respects and self-fertile. The spikelets consisted mostly of 3 well-developed florets. Selfed seeds were obtained from some colchicine-doubled sectors and callus regenerates. Most of the produced seeds were well developed. Backcrosses between amphiploids and rye (2x and 4x) resulted in obtaining (Ae. biuncialis S. cereale amphiploid) S. cereale hybrids via embryo culture. The BC1 plants (2n = 4x = 28 and 2n = 5x = 35, respectively) were phenotypically intermediate between the parents and vigorous in vegetative growth. Some seeds were obtained only from the 35-chromosome BC1 hybrids.

Key words: Aegilops kotschyi, Aegilops biuncialis, amphiploids, backcross hybrids, fertility, embryo culture, Secale cereale.

Correspondence: B. Wojciechowska, Institute of Plant Genetics, Polish Academy of Sciences, Strzeszynska 34, 60-479 Poznan, Poland; e-mail: bwoj@igr.poznan.pl

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