バレイショ近縁種に於ける種の分化に関する研究 II : S. longipedicellatum×S. chacoense の 3 倍性雑種に於ける染色体行動からみられた両親間の親和性

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1) In this paper, the meiotic behaviour in the F_1 hybrid (2n=36) from the cross S. longipedicellatum (2n=48)×S. chacoense (2n=24) was described with special reference to the chromosome affinity between the parent species. 2) At the first metaphase in the hybrid (12)_<II>+(12)_I were observed as the most usual configuration, with some exception of showing a few trivalents besides bivalents and univalents. The hybrid showed various meiotic irregularities at the first anaphase and subsequent stages, and almost complete sterility. 3) Based on the available data, it was provisionally concluded that most of the paired chromosomes in the hybrid may be formed by allosyndetic pairing between the chromosome sets of the parent species, and that, accordingly, this behaviour suggests that one set of 12 chromosomes in each of S. longipedicellatum and S. chacoense may be very similar or identical to each other.
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