巻号一覧
29 巻, 5-6 号
選択された号の論文の7件中1～7を表示しています
- |<
- <
- 1
- >
- >|
-
SHUN OKUNO, SHIZUE NAGAI1954 年 29 巻 5-6 号 p. 185-196
発行日: 1954年
公開日: 2007/11/30
ジャーナル フリーTwelve different chromosome numbers were found in eighteen plants of B. tuberohybrida examined (Table 1). Meiotic chromosome configurations were studied in seven plants, No. 5, 3, 9, 27, 22, 21 and D (Table 2). They were found to be striking polymorph with respect to the nuclear organization.
In a plant of B. tuberohybrida under investigation, a very peculiar type of abnormal meiosis was noted. It is characterized by the formation of multiple plates posterior to the first metaphase. And during the course of this division, a tendency of one genom to behave as an individual entity is shown.
In Begonia, chromosomes in pollen grain division were first demonstrated by the present study. Several different chromosome numbers were found. The results of chromosome counts were as follows; 28, 29, 30, 31, 35 and 10.
Expence of the present study was partly defrayed by a Grant in Aid for Fundamental Scientific Research of the Ministry of Education.抄録全体を表示PDF形式でダウンロード (1635K) -
III. COMPETITION AND SPACING IN ONE DIMENSIONKAN-ICHI SAKAI, YASUO SUZUKI1954 年 29 巻 5-6 号 p. 197-201
発行日: 1954年
公開日: 2007/11/30
ジャーナル フリーPDF形式でダウンロード (262K) -
VII. EXTERNAL CHARACTERS, FERTILITY AND SOMATIC CHROMOSOMES OF T. PYRAMIDALE×S. CEREALE F2 PLANTSGOICHI NAKAJIMA1954 年 29 巻 5-6 号 p. 202-204
発行日: 1954年
公開日: 2007/11/30
ジャーナル フリー1. The number of somatic chromosomes of TpyRF2 plant was counted to be 41, 42 and 43 according to individuals.
2. Considering from the number of somatic chromosomes of the F2 plant, the fertile gametes of F1 plant may have 20-23 chromosomes.
3. In general, the external characters of the F2 plant are more heterotic than those of the parents.
4. Seed fertility of the F2 plant has higher percentage than that of the F1 the individual having amphidiploid number of chromosomes having highest percentage.抄録全体を表示PDF形式でダウンロード (690K) -
第5報 稻四倍体品種及び品種間雜種に於ける染色体の行動岡 彦一, 謝 順景, 黄 眞生1954 年 29 巻 5-6 号 p. 205-214
発行日: 1954年
公開日: 2007/11/30
ジャーナル フリー1. A number of tetraploid rice varieties and their F1 hybrids were observed with regard to the behavior of chromosomes in pollen mother cells. It was found that in a greater part of cells every four homologus chromosomes formed either one quadrivalent or two bivalents, but a few univalents were also seen.
2. The average number per cell of quadrivalent and bivalent chromosomes differed with the variety or in hybrids with the combination of varieties, and ranged from 5 to 9 or from 5 to 12 respectively.
3. It was generally found that in intervarietal hybrids the numbers of quadri- and univalent chromosomes were less numerous than in auto-tetraploid varieties. Numerically unequal division at anaphase was also less frequent in hybrids. However, hybrids between mutually remote varieties and between close ones showed no significant difference in this tendency.
4. Hybrids were generally higher in fertility. Among the hybrids or the parental varieties, no significant correlation was found between the number of quadri- or univalent chromosomes and fertility.
5. The improvement of chromosome behavior in hybrids may be due either to selective pairing of chromosomes derived from the same parent or to a complementary effect of parental genes. It seemed difficult, however, to evaluate the relative probability of these two hypotheses from these cytological data.抄録全体を表示PDF形式でダウンロード (475K) -
渡辺 好郎, 百足 幸一郎1954 年 29 巻 5-6 号 p. 215-222
発行日: 1954年
公開日: 2007/11/30
ジャーナル フリーBy backcrossing to the F1s of (Triticum Timopheevi×T. vulgare) with their parents, 24 BF1 plants were obtained, of which 21 plants were raised by the pollen of T. vulgare. And our cytological observations were carried out principally on them.
Consequently it ws found that these 21 BF1 plants were consisted of the plants having 2n=37 (1 plant), 2n=38 (4 plants), 2n=39 (7 plants), 2n=40 (4 plants), 2n=41 (4 plants) and 2n=42 (1 plant) respectively, the mode of 2n chromosome number being in 39. From this, it can be infered that of the gametes formed in F1 plants, these having 18 chromosomes play best their function as female.
Moreover, the behaviour of chromosomes at MI of P.M.Cs. was observed somewhat in detail on the 7 plants with different chromosome numbers, of which 1 plant having 2n=30 chromosomes was the one backcrossed by Timopheevi (see Table 2 and 3).
As a result of these observations, it became evident that by backcrossing the numbers of univalents and multivalents in BF1 plants decreased considerably, but the numbers of bivalents, especially of closed bivalents increased in comparison with those in F1s, and therefore the fertility of BF1 plants was raised strikingly.抄録全体を表示PDF形式でダウンロード (980K) -
第II報 核分裂湯浅 明, 平野 正, 鈴木 治1954 年 29 巻 5-6 号 p. 223-227
発行日: 1954年
公開日: 2007/11/30
ジャーナル フリーMycobacterium 607について研究をおこなつた. 培養が古くなると球状の小細胞となる傾向をもつている. 培養が新しい中は, 棒状の細菌は核分裂の後に長く伸び, あるいは枝分れして伸び, ある時期に横に切れていくつもの細胞になる. また, 横分裂の後に, 一つずつの核をふくんで小突起を出し, これが母体からはなれて一つずつの細胞となる.
核分裂は核染色色素に染まり, Feulgen 反応陽性の小粒で, 1細胞中に1個であるが, ときに2個以上のこともある. 細胞の分裂ごとに一つの核をふくむ, 核のほかに顆粒状の液胞がある.
核分裂は無糸分裂で, 核は二つにちぎれてふえるが, その核分裂の様式は, 有糸分裂への進化の, ある段階を示しているようである.抄録全体を表示PDF形式でダウンロード (1346K) -
芳賀 〓1954 年 29 巻 5-6 号 p. 228-234
発行日: 1954年
公開日: 2007/11/30
ジャーナル フリーPDF形式でダウンロード (409K)
- |<
- <
- 1
- >
- >|