Abstract
Two kinds of sextuple monosomics for A-genome chromosomes, namely, one plant simultaneously deficient for chromosomes 1A, 2A, 4A, 5A, 6A and 7A and the other deficient for 1A, 2A, 3A, 4A, 5A and 6A, were produced in a systematic way in the variety Chinese Spring. Sextuple monosomics (15″ + 6′) were selected in the progenies of crosses between quintuple monosomics (16″ + 5′) and nullisomics (20″) which lacked the sixth pair of chromosomes. The sextuple monosomics were smaller, with reduced vigor and later maturity, compared with normal plants. They showed stable chromosome behavior in meiosis and retained fertility in both sexes. Female gametes with n = 16, 17, 18, 19, 20 or 21 produced from the quintuple monosomics functioned well in fertilization.
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