Cytogenetics of theScilla scilloides complex
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Four natural populations ofScilla scilloides Druce were analysed cytogenetically. The Ikeda and Taegu populations were pure populations composed of BB and AABB plants, respectively. The other two were mixed populations; the Shozugawa consisted of ABB, AABB and ABBB and the Nakabaru BB, BBB, ABB, AABB and ABBB. These populations have been maintained by sexual reproduction of sexually stable BB and AABB, and asexual propagation of sexually unstable ABB, BBB and ABBB.
In addition, many kinds of aneuploids were observed at the high frequency of 18.1% in the Shyozugawa and 6.8% in the Nakabaru. Occurrence of these aneuploids would be due to sexual propagation of the sexually unstable ABB and ABBB plants. From the spatial distributions of each type within the mixed populations, it was apparent that sexual propagation of ABB plants was effective in the presence of the sexually stable BB and/or AABB individuals.
KeywordsChromosome Constitution Sexual Propagation Asexual Propagation Supernumerary Chromosome Standard Pairing
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