Chromosome Damage Induced by Artificial Seed Aging in Barley. II. Types of Chromosomal Aberrations at First Mitosis

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Abstract
Chromosomal aberrations in anaphase cells of first mitosis in roots from artificially aged barley seeds were classified as bridge or fragment types. Single bridge, single fragment, and double bridge types comprised 77% of the chromosomal aberrations, and other types, less than 10% of the total. Combinations of fragments and bridges were very rare. High frequency of bridges was caused by chromosome stickiness, indicating that they were probably chromatid or, more correctly, subchromatid types rather than chromosome types. Chromosomal damage in aged seed may be induced by the irregularity of mitotic cell divisions during early stages of seed germination.