Cytogenetic Studies in Artificially Raised Interspecific Hybrids of Papaver. VI
The trigenomic hybrids of Papaver
1937 年 FujiiJubilaei 巻 2 号 p. 1101-1112_2
詳細
1937 年 FujiiJubilaei 巻 2 号 p. 1101-1112_2
1. A hybrid between P. somniferum and the plant No. 41-8 (a supposed natural hybrid between P orientale and P. bracteata) was produced. The F1 plant resembled the male plant mostly in its external characters, but a few characters resembled those of the female parent.
2. The chromosome number in the root-tip cells in many young F1 seedlings was 25 which is the sum of the gametic numbers of the parent plants, but the chromosome number of a matured F1 plant, from which the material of this cytological study was obtained, was 26. The one additional chromosome may haue been derived from the male parent.
3. There were found mainly two kinds of PMCs, an ordinary and an enormous one, in the F1 plant. The chromosome constitution in the ordinary PMC was 61II+lIII+11I. The meiosis in these PMCs was in general of the Triticum type and produced dyads, triads, pentads, hexads together with tetrads, also showing other irregularities, such as extranuclear chromosomes, chromosome bridge, lagging chromosome, miniature pollen grains, etc. The relationships of the genoms in the F1 plant were discussed.
Enormous PMCs derived from the archesporial cells by irregular premeiotic divisions were observed. Chromosome numbers in them were various, showing more bivalents and less univalents than those of the ordinary PMC. As a result some multiploid or aneuploid gametophyte may be produced.
The abortive-PMC is the small sister cell of the enormous one. It has always the resting nucleus showing no trace of the meiosis. This suppression of meiotic division is considered as due to a, gene or genes which govern the meiotic process.
Here the writer wishes to express her best thanks to Prof. K. Fujii, by whose suggestion these studies were started, for his valuable advice throughout the course of the work. The expence of carrying out this study was partly defrayed out of a graut from the Japan Society for the Promotion of Scientific Research, to which the writer's thanks are due.
