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Pre fertilization and post fertilization barriers to backcrossing the interspecific hybrid between allium fistulosum l. and allium cepa l. with allium cepa



Pre fertilization and post fertilization barriers to backcrossing the interspecific hybrid between allium fistulosum l. and allium cepa l. with allium cepa



Euphytica 53(3): 201-210



To facilitate the introgression of desirable traits of Allium fistulosum into the genome of A. cepa, several accessions of the hybrid between these species were pollinated with A. cepa as the recurrent parent, and in vitro ovary and ovule culture were perform to obtain an increase in the recovery of backcross progeny. Compared to the results from seed development in planta, the increase in the number of backcross progeny was generally very limited, and in some cases even a decrease was found. Raising the sucrose concentration in the ovary medium resulted in a higher frequency of ovules developing back seed coats but this was not followed by an increase in the number of backcross progeny obtained. Pollen tube growth of A. cepa was disturbed in the styles of the interspecific hybrids. Per ovule, frequencies of micropylar penetration exceeded frequencies of backcross progeny only to a limited extent. Hence, it was concluded that in the tested interspecific hybrid accessions the attainable gain in viable backcross progeny by the application of in vitro culture techniques is limited by strong pre-fertilization barriers acting at the level of stylar incongruity.

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Accession: 007674998

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