Summary
A population of 2xms sugar beets was crossed with 4x Beta lomatogona F. et M. The 3x F1-plants were male sterile and were backcrossed with 2x and 4x sugar beets and multiplied without pollination as well. After the 1st backcross mainly 3x apomict types arose again and, among others, a small number of successful 4x backcrosses. After pollination by 4x sugar beets this 4x F1 B1 produced. besides predominatly apomictically multiplied 4x plants, also about 7% haploid 2x hybrids. The latter probably possess 1 genome from B. vulgaris and 1 genome from B. lomatogona. In the meiosis of the PMC's a certain amount of homeology between a number of chromosomes of both species could be established. The amphihaploid hybrids can be used as breeding parents for the creation of types in which introgession can occur. During hybridization in addition to 2x and 4x B. vulgaris types a number of 2x-, 3x-, 5x- and 6x-hybrids arose. This is presumably caused by the presence of gametes with the somatic number of chromosomes and the occurrence sometimes of haploid apomictic multiplication.
The presence of large numbers of bolters in the F1 and F1 B1 suggests that the bolting tendency of both species is based on different genes.
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Cleij, G., De Bock, T.S.M. & Lekkerkerker, B. Crosses between Beta vulgaris L. and Beta lomatogona F. et M.. Euphytica 25, 539–547 (1976). https://doi.org/10.1007/BF00041589
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DOI: https://doi.org/10.1007/BF00041589