Introduction of allien variation into wheat by gene recombination. I. Crosses between mono V (5B) Triticum aestivum L. and Secale cereale L. and Aegilops columnaris zhuk.

摘要

An analysis is made of meiotic pairing of hybrids whether or not deficient in the chromosome V (5B) from crosses between Mono V (5B) T. aestivum var. Chinese Spring and Secale cereale and Aegilops columnaris. Transmission rates of deficiency are not equal for both combinations. Isochromosomes are found in the hybrid plants. 5B deficiency allows the pairing and recombination between the chromosomes of wheat and those of the related species. Such deficiency may be a useful wheat breeding tool to introduce alien variation into such cultivated species. Effectiveness of 5B deficiency on meiotic pairing of the hybrids, measured as the increase of the proportion of complement paired, is 36-37% and 49-50% in the hybrids involving rye and Ae. columnaris respectively. Minimum percentages of the introduction of alien variation into wheat are established for the material investigated: 2% for rye and 28% for Ae. columnaris. Methods of utilisation of the 5B deficiency in a programme of wheat breeding are discussed and outlined.