巻号一覧
32 巻, 11-12 号
選択された号の論文の3件中1～3を表示しています
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Some conspicuous characters appearing in male-sterile Emmer wheatsHirosuke FUKASAWA1957 年 32 巻 11-12 号 p. 313-322
発行日: 1957年
公開日: 2007/05/21
ジャーナル フリーThe present report deals mainly with a description of three conspicuous characters which appeared in male-sterile durum and other Emmer wheats with ovata cytoplasm, and also in ovata plants with durum cytoplasm.
1) Retardation of vegetative growth occurs in all strains possessing the ovata cytoplasm and Emmer genomes. Its retardation begins at germination, and heading delays for about two weeks as compared with normal Emmer wheats. The degree of retardation is more striking in the group sown at unusual seasons than in those at the normal conditions, and varies with the different strains used as pollinators. On the other hand, ovata plants with durum cytoplasm have also shown a delayed heading over one week, in spite of having a normal pollen production.
2) Male-sterile Emmer plants possess a considerably lower culm than normal plants. The difference in plant height between normal and male-sterile plants is distinguishable clearly and varies with the time of sowing, showing a greater difference in the later sowing than in the earlier sowing.
3) A conspicuous chlorophyll variegation of whitish dots and stripes appears in male-sterile durum strains. Its appearance varies with the growing stages, showing a maximum symptom during the winter season. In some Emmer strains with ovata cytoplasm, no variegated leaves were observed. Reciprocally substituted plants consisting of ovata genomes and durum cytoplasm do not show any chlorophyll veriegation, having normal pollen production.抄録全体を表示PDF形式でダウンロード (1260K) -
Hisao ARANO1957 年 32 巻 11-12 号 p. 323-332
発行日: 1957年
公開日: 2007/05/21
ジャーナル フリー1. The karyological investigations of Subtribe Carduinae were made on seven species and two varieties in Cirsium and three species in other related genera Atractylodes, Hemistepta, Carduus.
2. There can be found that Hemistepta lyrata Bunge is karyologically different from the members of Cirsium and shows to have a peculiar karyotype.
3. The karyological differences between two genera, Carduus and Hemistepta are found.
4. All the members of the genus Cirsium are classified into three types from the view point of the karyotype and the Cirsium type is subdivided into four different subtypes showing an agreement with the Kitamura's taxonomic systems.
5. No differences could be karyologically found in the karyotypes of the following species; C. Tanakae Matsum and C. T forma obvallatum Makino, indicating that they are unstable ecological variants.抄録全体を表示PDF形式でダウンロード (1102K) -
山本 時男1957 年 32 巻 11-12 号 p. 333-346
発行日: 1957年
公開日: 2007/05/21
ジャーナル フリーThe sex-differentiation of the gonad in a cyprinodont fish (the medaka, Oryzias latipes) indicates that it is a “differentiated” species. There is no evidence of juvenile hermaphroditism in normal development. The effects of estrogens (estrone and stilbestrol) and an androgen (methyl testosterone) on gonadal sex-differentiation were studied in a genetically analyzed breed (d-rR strain). The sex-linked characters R (orange-red) and r (white) were used as markers of the sex-chromosomes in order to distinguish the sex genotype. The offspring of white females (XrXr) mated en masse with heterozygous orange-red males (XrYR) are usually white females and orange-red males since the R (dominant in effect) is resident only in the Y chromosome. Peroral administration of either estrone (1, 250 i.u./g-diet) or stilbestrol (5, 000 i.u./g-diet) from the time of hatching up to the age of several months results in reversal of sex differentiation in genetic males (XrYR). Fully grown sex-reversed females of the male genotype have reproductive capacity, yielding offspring in mating with normal males.抄録全体を表示PDF形式でダウンロード (1909K)
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