Cytogenetical Evidence for Latent Centromeres and Reactivation in Chromosomes of Haplopappus gracilis (Asteraceae)
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Rearranged karyotypes of 2n=5 present in three plants of Haplopappus gracilis (2n=4) were cytogenetically analyzed to clarify the origin of an additional centromere in the chromosome complement. One of the plants was a progeny of the homozygote with normal chromosome 1 crossed with the heterozygote with normal and centromere-shifted chromosome 1. The other two plants were derived from seedlings irradiated with X-rays during early germination stage. The chromosome complement of 2n=5 found in the first plant was comprised of 3 normal chromosomes (one chromosome 1 and two chromosome 2) and two rearranged chromosomes each possessing a centromere at the subterminal position. All the chromosome complements of the irradiated plants were similar to each other and each consisted of three normal chromosomes (one chromosome 1 and two chromosome 2) and 2 rearranged chromosomes, one large and metacentric and the other, fragment-like. The origin of the additional centromere in each complement of 2n=5 is discussed from the point of chromosomal evolution in the genus Haplopappus.
- 財団法人 日本メンデル協会の論文
財団法人 日本メンデル協会 | 論文
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