巻号一覧
33 巻, 5 号
選択された号の論文の4件中1～4を表示しています
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V. The chromosomes of American Aster speciesYukio HUZIWARA1958 年 33 巻 5 号 p. 129-137
発行日: 1958年
公開日: 2007/11/30
ジャーナル フリー1. The karyotypes of 15 species of American species of Aster are reported.
2. The chromosome numbers of 9 species are reported here for the first time. These are: A. modestus 2=18; A. puniceus 2n=16; A. concinus 2n=46; A. pilosus 2n=48; A. simplex 2n=64; A. chilensis 2n=64; A. exilis 2n=10; A. occidentalis 2n=16; A. alpigenus 2n=18.
3. The primitive basic chromosome number for the genus is considered to be 9.
4. Judging from the chromosome numbers and the karyotypes the origin of this polyphyletic genus is probable in the American species of Aster.
5. In strong contrast to the symmetrical karyotype of Asiatic species of asters, there is a marked increase in asymmetry in the karyotype of the American species.
6. In general the chromosomes of the New World taxa are smaller than those of the Old World species.抄録全体を表示PDF形式でダウンロード (461K) -
阿部 潔1958 年 33 巻 5 号 p. 138-145
発行日: 1958年
公開日: 2007/11/30
ジャーナル フリー1) キイロショウジョウバエのアミラーゼ作用は系統間に差異があり, Hikone-AS はOregon-R (iso) に比較してはるかに強い。
2) 両系統のF1は両親の中間値を示す。このことからアミラーゼ作用は不完全優性の性質と思われる。また強×弱, 及び弱×強のF1を雌雄別に測定した結果, この性質は伴性遺伝をしないことを知った。
3) Hikone-AS 及び Oregon-R (iso) 両系統共卵期におけるアミラーゼは極めて弱く, 幼虫期, 殊に3令期において最も強く, 化蛹と共に急激に減少し, 以後は成虫期まで殆んど一定の力価を保っている。
4) 幼虫と成虫から体液及び消化液をそれぞれ分離して測定した結果ではショウジョウバエのアミラーゼに関する遺伝子はその両液の酵素作用を支配するものと思われる。
5) 澱粉欠乏培地に澱粉及び各種の糖類を添加したものでは, 澱粉を加えた培地に飼育して得られたF1及びF2の成虫のアミラーゼは大である。おそらく澱粉がアミラーゼの inducerとして働くのであろう。抄録全体を表示PDF形式でダウンロード (488K) -
IV. F2植物の花粉母細胞成熟分裂中島 吾一1958 年 33 巻 5 号 p. 146-154
発行日: 1958年
公開日: 2007/11/30
ジャーナル フリー1. The meiosis of PMC's of 35 individuals of F2 raised between two species of Triticum and Secale cereale is described.
2. The number of bivalents observed in one PMC is 11-23 at the heterotypic metaphase of Triticum-Secale triple F2 plants, and the frequency of those bivalents is shown in Table 1. And the mode of the number of bivalents was 14II in the individuals having 2n=28-32 chromosomes, 15II in those of 2n=33-37, 15II-19II in those of 2n=38-44 and 17II-21II in those of 2n=45-50. Generally, the number of bivalents increases as the number of chromosomes increases; showing that the number of homologous chromosomes will also increase when the number of chromosomes increases.
3. Trivalents or tetravalents, suggesting that the plants have 3 or 4 homologous chromosomes.
4. Triticum-Secale triple hybrids employed in the present research are of the 2nd generation raised from the hybridization between two species of Triticum and Secale cereale each of which has quite different nature. Therefore, the meiosis in PMC's is very anomalous.抄録全体を表示PDF形式でダウンロード (488K) -
小野 記彦, 永井 静江1958 年 33 巻 5 号 p. 155-162
発行日: 1958年
公開日: 2007/11/30
ジャーナル フリーThe hybrid between Paraixeris denticulata (n=5) and Lactuca squarrosa (n=9) is composed of cells with different numbers of chromosomes, which are smaller than the expected 14. In the hybrid hitherto reported, a single karyotype with 12 chromosomes was predominant.
A further investigation was carried out with the parental plants of different origin. The results are somewhat different from the former hybrids.
The mosaic condition with different karyotypes is also observed in the present hybrids. But karyotypes with 10 chromosomes seem to be predominant over the others in much less extent than in the former hybrids.
Better mitotic plates are obtained when plants are germinated in a sterilized agar culture medium than on filter paper or in soil.
Cold treatment of plants (0°C, 3-5 days) reveals some patterns of the chromosomes, which make the identification of an individual chromosome more easy.抄録全体を表示PDF形式でダウンロード (1762K)
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